C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

L31R replacement engine?

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Old Jan 5, 2013 | 02:09 AM
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Zorro O
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Default L31R replacement engine?

I have a C3 you guys help me get a L98 running in. Now need to replace it, so I'm back. I posted this in C3 and got some great, useful opinions. Please let me know what you think. I can't afford to get this wrong.

I have a 1979 C3 that until recently had an L98 with a 700R4 in it. The motor is gone. I still have a 700R4 trans, and all the stuff that bolts to the motor including a TPI setup that I like very much. I have been looking at crate motors, but have had trouble finding what I would like, (a 350 with at least 250hp, a roller cam, and be compatible with the TPI). What I am wondering is, would this motor, the way it comes LINK with the right base plate for my TPI, be appropriate? My objective is reliability, decent power (250+), decent millage (20+Hy), total expense under $3000.00.

Thanks for looking.

Zorro
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Old Jan 5, 2013 | 02:31 AM
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Originally Posted by Zorro O
I have been looking at crate motors, but have had trouble finding what I would like, (a 350 with at least 250hp, a roller cam, and be compatible with the TPI). What I am wondering is, would this motor, the way it comes with the right base plate for my TPI, be appropriate?
My objective is reliability, decent power (250+), decent millage (20+Hy), total expense under $3000.00.
Would be fine , possibly need a cam change to suit the TPI better
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Old Jan 5, 2013 | 12:33 PM
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Vortec heads, will the TPI, exhaust and acessories bolt up?
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Old Jan 5, 2013 | 02:24 PM
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Originally Posted by Muffin
Vortec heads, will the TPI, exhaust and accessories bolt up?
This is the intake I would be using. LINK I believe the heads have D shaped exhaust ports, they appear to have the standard accessory bolt holes. But thanks for the reminder I had better check those things out.

Zorro
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Old Jan 5, 2013 | 03:19 PM
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I bought that short block the only thing I didnt like was the pistons were dished so I used a thinner head gasket .028 also with 64cc chambers ended up with 9.5 static compression.
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Old Jan 5, 2013 | 03:23 PM
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My short block didnt come with a cam I ended up using the zz4 cam with a mild tpi setup and street driving works nicely
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Old Jan 5, 2013 | 06:04 PM
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Vortec heads will require different exhaust or the ports will be partially blocked. I had vortec heads on my 91 and swapped to LT1 exhaust.

Last edited by ch@0s; Jan 5, 2013 at 06:07 PM.
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