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Old 06-07-2018, 08:26 PM   #1
H311RA151N
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H311RA151N : 1988 Chevrolet Corvette Convertible







Engine :

L98
Factory Aluminum Heads 58cc
Flat Top Pistons from 90+ L98
0.30" (355ci)
10:1 Compression
Blueprinted and Balanced
Lunati VDSC-262 Roller Tapet Camshaft 262/270 112LSA
Lunati 638-73943-16 Valve Springs 462 lbs./in.
Factory 1:5 Roller Rockers
Street Tune
Stainless Works Headers
Delete Catalytic Converters
Delete Mufflers

Transmission :

700R4
B&M Shift Kit
TCI 2200-2400 Stall Locking

Differential :

Dana 36
LSD
3.07 Ring and Pinion

Exterior :

Full Greenwood Graphics Kit
Repainted Factory White
ZR-1 Wheels
Cooper Cobra Tires

Future Plans :

Edelbrock Performer Carbureted Intake Manifold
MSD Atomic EFI Throttle Body System
MSD Distributor
MSD 6AL 2 Ignition Box
Dana 44 Rear Diff & Batwing (3.45s)
Performance Rebuild 700R4
1650 Stall Converter
B&M Ratchet Shifter
Dewitts Aluminum Radiator


I've had this car for a while. It's in Missouri with my Talon. Just under 100k on it. I picked it up from a family member for only 5k. The engine has 30k on it since it was built. Car has been 13.6 with drag radials. Want to put drag radials back on but can't with the D36. Need a D44 from 6 speed C4.

Car is in Missouri. Not the best of pictures. Might go back later this year. If I do I'll take more pictures.





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Old 06-07-2018, 08:48 PM   #2
Size9zombie
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Very nice.
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Old 06-07-2018, 09:03 PM   #3
H311RA151N
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Car has A/C but is not working. I have my EPA 609 certification so this car will stay R12. 609 permits one to purchase reclaimed R12 refrigerant.



I recommend anyone working on their A/C system in their car to at least obtain a Section 609 certification. To have a properly functioning A/C system that will work as intended for years on end you need to understand what it is your actually doing rather than just following a process. Obtaining a 609 certification is also one way to protect the environment and have the knowledge to stay legal.
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Old 06-07-2018, 09:07 PM   #4
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Originally Posted by Size9zombie View Post
Very nice.
Thank you. I only wish I had better pictures.

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Old 06-07-2018, 09:12 PM   #5
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I've been seeing the coupes fairly often in traffic lately, and this generation's actually starting to grow on me.
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Old 06-07-2018, 09:25 PM   #6
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I've been seeing the coupes fairly often in traffic lately, and this generation's actually starting to grow on me.
I originally bought it to help someone out who was about to move half way across the country. I still think it was a good decision on my end. Which wasn't my original intent.

I would rather have a hard top with a Doug Nash 4+3 honestly. But the auto vert is ok. It gets 24-26mpg highway on 93 with quite a bit of timing and no knock counts.

L98 is a torque monster. But the Lt1 C4 has 60ish ponies on it. With everything done to it it's probably only as fast as a stock LT1 C4. That being said I think a later C4 would probably be what I'd choose if I was looking.
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Old 06-07-2018, 09:54 PM   #7
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Something funny I'd like to add is that I was worried that insurance was going to kill me. To stay legit I have to have two policies, one in Mo and one in Wy. When I added the Corvette to the Talon insurance policy it raised my premium $13/mo. Both my truck and my Accord are more expensive to insure. Wild as that sounds. I have Progressive for anyone who's wondering. There are other factors I'm sure. Still yet that wasn't what I was expecting.
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Old 06-07-2018, 10:08 PM   #8
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I'm actually thinking about getting a Cayman in the next few years, so I checked into insurance. Given the same coverage, the Porsche is a bit cheaper to insure than my RSX. Maybe because mine's a known "tuner car?" The Accord I don't get, but I can understand your truck being considered a vehicle expected to be abused. Corvettes and Porsches are more for responsible mid-life crises, haha.
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Old 06-07-2018, 10:34 PM   #9
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Quote:
Originally Posted by H311RA151N View Post
Car has A/C but is not working. I have my EPA 609 certification so this car will stay R12. 609 permits one to purchase reclaimed R12 refrigerant.



I recommend anyone working on their A/C system in their car to at least obtain a Section 609 certification. To have a properly functioning A/C system that will work as intended for years on end you need to understand what it is your actually doing rather than just following a process. Obtaining a 609 certification is also one way to protect the environment and have the knowledge to stay legal.
Yes, this.
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Old 06-07-2018, 11:03 PM   #10
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Quote:
Originally Posted by H311RA151N View Post

L98 is a torque monster. But the Lt1 C4 has 60ish ponies on it. With everything done to it it's probably only as fast as a stock LT1 C4. That being said I think a later C4 would probably be what I'd choose if I was looking.
I know quite about the TPI system, first off the TPI itself will be the anchor holding you back; sad to say but even with the higher compression aluminum heads(which flow less than the vortec) and a full port/polish and siamese job they will be far where you think it will be at. Dyno will show that the TPI system runs out of steam below 5k, mine would fall flat on its face right after 4200 and after the TPIS big mouth intake and siamese runner kit it still wouldnt make it to 5k. The TPIS intake system was never meant to go on the 350 sbc as GM was planning to use it on the 305, add cam to the equation and you end up with a platform that starts pulling right before the point where it stops breathing. Go over to thirdgen and see if you can score a LT1 intake that has been already converted for a SBC retrofit and go that route; tuning will be another issue as nobody wants to waste time on these so you have to resort to mail order tunes. I could keep going on and on and on.............
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Old 06-08-2018, 12:47 AM   #11
H311RA151N
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Quote:
Originally Posted by CyborgGT View Post
I'm actually thinking about getting a Cayman in the next few years, so I checked into insurance. Given the same coverage, the Porsche is a bit cheaper to insure than my RSX. Maybe because mine's a known "tuner car?" The Accord I don't get, but I can understand your truck being considered a vehicle expected to be abused. Corvettes and Porsches are more for responsible mid-life crises, haha.
I don't understand their reasoning myself. Maybe they go by statistics? That's funny about the Porsche being cheaper to insure than your RSX. Apparently I'm not the only one experiencing this. There is some logic or formula to it then.

Mid-life crises. I have a few years yet but I'm preparing early.
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Old 06-09-2018, 12:30 PM   #12
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Originally Posted by H311RA151N View Post
I don't understand their reasoning myself. Maybe they go by statistics? That's funny about the Porsche being cheaper to insure than your RSX. Apparently I'm not the only one experiencing this. There is some logic or formula to it then.

Mid-life crises. I have a few years yet but I'm preparing early.
My Corvette is the cheapest car I insure of the 3 on my policy (Tacoma and Grand Cherokee). Granted, I have a low mileage discount on it, but still.

My STi with the same discounts as the Corvette was nearly double.
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Old 06-09-2018, 12:32 PM   #13
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Originally Posted by H311RA151N View Post
I originally bought it to help someone out who was about to move half way across the country. I still think it was a good decision on my end. Which wasn't my original intent.

I would rather have a hard top with a Doug Nash 4+3 honestly. But the auto vert is ok. It gets 24-26mpg highway on 93 with quite a bit of timing and no knock counts.

L98 is a torque monster. But the Lt1 C4 has 60ish ponies on it. With everything done to it it's probably only as fast as a stock LT1 C4. That being said I think a later C4 would probably be what I'd choose if I was looking.
I always liked the look of the early cars with the running gear of the later. I'd go LS over LT just for ease of parts availability.

Anything on your car unobtanium yet? There's a few parts on mine that are no longer in production and have a decent failure rate, so used is the only option.
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Old 06-10-2018, 06:29 AM   #14
H311RA151N
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Originally Posted by AccordWarrior View Post
I always liked the look of the early cars with the running gear of the later. I'd go LS over LT just for ease of parts availability.

Anything on your car unobtanium yet? There's a few parts on mine that are no longer in production and have a decent failure rate, so used is the only option.
I like the "angles" on the car. Especially being a convertible. It reminds me of the F117 stealth fighter. Most of the car has similar angles in it's design. If that makes sense.

If I was going to do much at all with it I'd opt for an LS. Since I'm a cheapo I'd probably go 5.3. Lol But it's staying L98 for sure.

I haven't found anything that's really hard to get. Yet. I haven't messed with it at all. Just looked around. I'm sure there are quite a few items that I'll never find if I need them. But I hope I never have to find out.

Owning a Ford with a big block, a 2g DSM and a Honda I'm delighted to see how affordable most Chevrolet parts are. Anything not Corvette related is readily available and cheap. Like anything engine related is cheap. Same with the transmission. That's a nice change.

As for the insurance that's an unexpected surprise for me. I wish my Honda and truck were cheaper to insure. But I'll take the win on the Vette. It helps.
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Old 06-14-2018, 08:48 PM   #15
H311RA151N
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I asked the previous owners if they could answer some questions and tell me a little more about the car. I know both the previous owners, my father in law and the individual he bought the car off of 3 years ago.

The wheels aren't ZR-1 wheels, they're off a 96 Corvette.

Heads are aluminum 113 Corvette D port heads. As opposed to 083 or 081 Camaro heads.

The block and both heads are numbers matching to the car.

The original owner of the car who I know personally had a shop in Cedar Rapids IA build the car. Originally he wanted to replace the L98 with a GM crate engine and go carburetor. However the shop advised him not to as they were more concerned about depreciating the value of the car. They reccomended doing as much as they could to the L98 for the same cost as a crate engine while keeping it numbers matching.

I thought the engine had 30,000 on it since it was built give or take. Apparently it has about half that. The odometer reads 93,000 and the engine was built at 79,000.

The 113 aluminum heads have an aftermarket set of 2.0/1.570 valves installed. They're moderately ported and flow 230 or 240cfm. The original owner provided me with this information and believes they flow at 230cfm but isn't certain if it 230 or 240.

The pistons are flat tops in .030 and gives it a 10.25:1 compression ratio.

The bottom end is all factory replacement, stock rod and main journals. L98's are two bolt mains. It has a standard volume and pressure oil pump.

The rotating assembly was balanced. Stock crank and rods with aftermarket replacement pistons.

The car is an imposter 35th anniversary edition. It has the badges and decals of a 35th anniversary edition but it's not a real 35th edition car. The real 35th anniversary edition is a white on white on white coupe. Real Corvette enthusiasts will notice this immediately. Corvette enthusiast I'm not and I still don't care for it having the incorrect badges.

The 700r4 transmission has a shift kit and the shift points modified. It shifts about 200rpm higher in every gear. And of course it has a little higher than factory stall converter.

The car has a $6300 paint job and a $2000 Greenwood graphics kit.

The original owner bought the car new, paid just over $30,000 in '89 and drove it occasionally until 2008. They spent 3 years building it (having it built mostly) and had the graphics kit installed along with new paint when it was completed in 2011. My father in law bought it in 2015 for $7500. He put 5,000 miles on it since and I bought it for $5,000.

The original owner bought an '06 Z06 in early 2015 and quickly lost interest in this C4.

That's the story on the car.
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Old 06-14-2018, 09:18 PM   #16
H311RA151N
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I know quite about the TPI system, first off the TPI itself will be the anchor holding you back; sad to say but even with the higher compression aluminum heads(which flow less than the vortec) and a full port/polish and siamese job they will be far where you think it will be at. Dyno will show that the TPI system runs out of steam below 5k, mine would fall flat on its face right after 4200 and after the TPIS big mouth intake and siamese runner kit it still wouldnt make it to 5k. The TPIS intake system was never meant to go on the 350 sbc as GM was planning to use it on the 305, add cam to the equation and you end up with a platform that starts pulling right before the point where it stops breathing. Go over to thirdgen and see if you can score a LT1 intake that has been already converted for a SBC retrofit and go that route; tuning will be another issue as nobody wants to waste time on these so you have to resort to mail order tunes. I could keep going on and on and on.............
I missed your comment somehow. My apologies.

I'm not going to mess with it enough for it to matter. The heads are modified quite a bit. I was told on CorvetteForun that the TPiS mini ram would compliment the current modifications. But that's over a $1000 setup so I don't know if I can justify it to be honest.

I'm in the process of obtaining my CDL for work. Granted the car is 1300 miles away from me. However I think it's plenty fast the way it is. I don't plan on driving it fast or making it into something that will get me into trouble.

In case your unaware as I sure was, these cars are incredible in stock form. Check this L98 C4 out on the track. Chasing and passing a GT3. These cars aren't a slouch. It's capable of more than I am as a driver without a doubt. I still wish it had the 4+3...

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Old 09-11-2018, 06:51 PM   #17
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I destroyed the transmission in this last night. I got it back from Missouri and drove it around a bit. I took off from a stop light and pinned it to the floor. It spun through an intersection staying pretty straight and hooking nicely. It grabbed second and started to gain traction. It was the first launch I ever done in it and I was very impressed. Although I lost overdrive a few miles later and then 2nd and reverse.

The 700r4 is toast. I think the tv cable was probably adjusted wrong anyhow after reading.

I'm getting it the 700r4 rebuilt and "bullet proofed". Going with a little higher stall.

Stop light to stop light it's quite impressive. I'm surprised even though the transmission went out.

Oh well. Build bigger and stronger now.
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Old 09-11-2018, 08:10 PM   #18
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Originally Posted by H311RA151N View Post
I missed your comment somehow. My apologies.

I'm not going to mess with it enough for it to matter. The heads are modified quite a bit. I was told on CorvetteForun that the TPiS mini ram would compliment the current modifications. But that's over a $1000 setup so I don't know if I can justify it to be honest.


In case your unaware as I sure was, these cars are incredible in stock form. Check this L98 C4 out on the track. Chasing and passing a GT3. These cars aren't a slouch. It's capable of more than I am as a driver without a doubt. I still wish it had the 4+3...
Yeah but that car already has a Hot cam, Mini ram and exhaust done; The L98 was a SBC with an actual FI setup that was never actually designed to work with the engine itself(but the 305). Once you take the TPI system out of the equation the engine can be powerful for cheap since its just an aluminum headed, high compression, roller 350. Sorry to hear about the transmission, the torque on those engines comes in very nicely and abuses those things all day long.
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Old 09-12-2018, 07:07 PM   #19
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So I'm going with an upgraded 700r4 from Monster Transmission.

I just found out that I know someone with an LS3 that I can get for about the same price as the transmission. So I'm going to talk it over with the owner at work tomorrow. Catch is I'd have to help pull it out of a wrecked car with side impact damage. From the pictures it looks not too hard but the steering column area is crunched. Car still runs great. Actually can drive enough to move around.

We'll see.
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Old 09-12-2018, 08:11 PM   #20
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So I'm going with an upgraded 700r4 from Monster Transmission.

I just found out that I know someone with an LS3 that I can get for about the same price as the transmission. So I'm going to talk it over with the owner at work tomorrow. Catch is I'd have to help pull it out of a wrecked car with side impact damage. From the pictures it looks not too hard but the steering column area is crunched. Car still runs great. Actually can drive enough to move around.

We'll see.
Are you gonna keep the old transmission on the LS3 or getting the trans too? If you go the 700R4 route there is a plate that can be used to mount the LS to the 700 while using the factory L98 mounts. There is a video on youtube that talks about the retrofit and while he chose to go carburated the FI should not be that much different. LS will open doors that exceed beyond the expectations you have right now, there are cams for sale now that allow the swap to happen without a spring change being necessary and claim 66hp.
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