need help with lt1 heads!!!
need help with lt1 heads!!! jw, i just got a fully forged shortblock. Forged crank, forged rods, forged pistons. With stock heads the compression is 9.25:1
My question is, i have 107,000 miles on my heads, can i just get my stock heads re-worked, valve job,etc..and run 12 psi fine? because if i get aftermarket heads, the compression will be alot higher so i wont be able to run as much boost..
Also, if i just re-work my stock heads, how will my head gaskets be? i mean im sure ill be fine but i have peope telling me i need aftermarket heads..like ported afr's..
My question is, i have 107,000 miles on my heads, can i just get my stock heads re-worked, valve job,etc..and run 12 psi fine? because if i get aftermarket heads, the compression will be alot higher so i wont be able to run as much boost..
Also, if i just re-work my stock heads, how will my head gaskets be? i mean im sure ill be fine but i have peope telling me i need aftermarket heads..like ported afr's..
With aftermarket heads your compression will not be higher, it will be lower if anything. No aftermarket head for the lt1 has a chamber smaller than stock. The TFS is larger, and the AFR is stock to larger (55-65c).
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Me and Razor were talking on AIM, and my question about his block is this. It says it's a 9.25:1 block, but on another site I saw them list their block as like 9.75:1 but that was w/o heads and like 10.6:1 with stock LT1 heads on. I don't quite know how they calculate w/o the heads, but is this what they usually do with shortblocks?
General rule of thumb for most motors (from what lots of people have told me) is you want to run lower CR to run more boost. But the LT1 is a bit different from the rest of the crowd. He run 8psi now on the stock motor, so with the forged short block and assuming he left the heads and cam alone, could he still run 12psi with 10.5:1 CR?
And another Q to help him, should he get chrome-moly push rods and a new set of lifters? Like even just LSx ones with 30Kmi or so on them?
General rule of thumb for most motors (from what lots of people have told me) is you want to run lower CR to run more boost. But the LT1 is a bit different from the rest of the crowd. He run 8psi now on the stock motor, so with the forged short block and assuming he left the heads and cam alone, could he still run 12psi with 10.5:1 CR?
And another Q to help him, should he get chrome-moly push rods and a new set of lifters? Like even just LSx ones with 30Kmi or so on them?
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Verdad Gallardo TECH Senior Member
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From: Decatur, TN (N-W of Athens)
Originally Posted by infinitebird
12psi with 10.5:1 would not be a good idea imo.
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I have a set of Gen I 2.02/1.60 valves. Will they fit in LT1 heads with the proper machining? I was going to sell them to him, and I was pretty sure they would work.
An LT1 is a small block chevy with reverse flow cooling necessitating a different WP, a front mounted distributor, and sequential port injection. Beyond that almost everything interchanges.
I would not go throwing big valves at it.
Seems that someone needs to point out boost is a measure of how much air IS NOT getting into the cylinders. Put good heads on there and run 8psi making more power with less stress on the front of the crank, belt, and blower using the same pullies.
I would not go throwing big valves at it.
Seems that someone needs to point out boost is a measure of how much air IS NOT getting into the cylinders. Put good heads on there and run 8psi making more power with less stress on the front of the crank, belt, and blower using the same pullies.