summit has a add for the LT4 conversion kit for the LT1. they calm these LT4 parts are proven to give you 425hp.... intake -hot cam -heads-1.6:1 rockers. now some how i can't see just those mods making that horsepower since they aren't really anything serious. what do you guys think? i have a bunch of things already done to my car but no heads or cam setup yet.
Posted by 01SunsetOrangeSS (Member # 846) on :
A good heads and cam package will easily make an additional 100 hp at the crank. The LT4 was rated at 330 hp and consistantly ran 330-345 RWHP, with the addition of a "hot cam" I can easily see it making 425 hp at the crank.
Posted by Z28-SORR (Member # 1565) on :
People who have done this, say that 425hp is probably the upper limit that you can normally get but easy 400+. And that you can make more hp doing your own heads and cam. cheaper. This package does have one important advantage going for it. It is a factory proven package that will get you 400+hp and is street compatible.
Posted by jeffsz28 (Member # 2128) on :
check your email guys- thanks
Posted by HM Murdock (Member # 728) on :
My old car, with the LT4 setup, .060 over, and higher compression with a CC306 did 401/422 unlocked through a Yank at the rear.
It's worth it to get it, and have the heads ported, IMHO. The LT4 hotcam is too small, really.
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