3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

85 l98 build?

Old 01-31-2019, 05:55 PM
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85 l98 build?

I just bought a 1974 Camaro with 70 front end swap it has a 85 l98 that carbed in it trying to figure out best cam and carb for it and if I'll need new heads and distributor looking for budget horsepower any advice would be greatly appreciated. Aiming for apx 400hp if possible
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Old 02-02-2019, 03:12 PM
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Re: 85 l98 build?

You're probably going to need new heads for 400-450 HP (is that goal at the flywheel or at the rear wheels?), particularly for the 450 HP number. The cast iron GM Small-Port Vortec Bowtie heads can make that kind of power at the flywheel. If you prefer aluminum, there's the GM Fast Burn heads. Both those are tapped for both the Vortec intake manifold and the earlier SBC intake. There are other aftermarket heads available.

https://www.gmperformancemotor.com/category/SB145.html

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Old 02-02-2019, 07:32 PM
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Re: 85 l98 build?

Originally Posted by Injuneer View Post
You're probably going to need new heads for 400-450 HP (is that goal at the flywheel or at the rear wheels?), particularly for the 450 HP number. The cast iron GM Small-Port Vortec Bowtie heads can make that kind of power at the flywheel. If you prefer aluminum, there's the GM Fast Burn heads. Both those are tapped for both the Vortec intake manifold and the earlier SBC intake. There are other aftermarket heads available.

https://www.gmperformancemotor.com/category/SB145.html

if I go 400 flywheel and did those heads would I need a better cam as well and stall? Thanks for info
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Old 02-03-2019, 09:49 AM
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Re: 85 l98 build?

You will need a more aggressive cam to meet your goal. Maybe you could even hit the 400 HP @ the flywheel with the base Vortec heads. You have to select the heads and cam as a package, so the duration and lift takes advantage of the head flow characteristics. I'm not up on selecting a cam for a carb setup. For the last 25 years I've been dealing with the fuel injected LT1.

Unfortunately, the number of users on this site with 3rd Gens has really declined. Seems the only active area is the few die hard LT1 users. Every once in a while a veteran 3rd Gen owners will show up and look through the posts on this particular forum.
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