what kind of performance to expect
Thread Starter
On The Tree
Joined: Dec 2002
Posts: 105
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From: baton rouge Louisiana
what kind of performance to expect I just failed in my converion to an ls1 attempt so im rebuilding my old lt1 and have to replace my cracked heads I was concidering buying lt4 heads here are the numbers 1995 LT1 Ported&Polished heads with LT4 springs, 3 angle cut Competition Ferrea Valves (2.02 and 1.6), and Titanium retainers. Should flow 230ish cfm at .550 lift. This along with the lt4hotcam what kind of numbers should I expect? My only other mods are ram air intake. Thanks for all the answers you can give me. I want hp # and quarter times just a good estimit will do fine for me.
TECH Resident
Joined: Jun 2002
Posts: 943
Likes: 2
From: Houston
Re: what kind of performance to expect if you dont have an adequate intake and exhaust sytem, the heads wont do much at all. the motor is a huge vacuum, it wants to get air in and out as fast as it can. you can have a huge punp, but if its sucking through a straw and blowing out another straw, then the pump is useless. you need to open the intake and exhaust up on the motor before you will see good numbers from the heads.
Teching In
Joined: Dec 2002
Posts: 32
Likes: 0
From: NUNYA
Re: what kind of performance to expect I went from 245rwhp and 270rwtq to 317rwhp and 308rwtq with LT4 HotCam, LT4 Intake, LT4 heads, shorty headers, 1.6 rr, 52mm TB, Ram Air and 30lb injectors, reprogrammed ECM and Muffler Elims. This was on a 96 Vette, but you should see pretty much the same. Add in my 3.73 gears, 2800TC and shift kit (Mines and Auto) and I went from a 13.7@101 to a 12.5@111. Your times might be a little slower, due to weight, but you should see something close to it.
