LT4 Conversion in '94 Z07
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 234
From: Bangkok, Thailand
Don't forget - it's not just about making a certain peak number. For real performance it's about making the most power over a broad range. To clarify - if you move your power band up to a range where you rarely run the engine and then lose power where you normally run it, you'll have lost "overall" performance. Sure it may haul when you redline it but how much time can you spend at redline? I'd take 375 hp and 450 ft/lbs over 430hp 400 ft/lbs any day.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Mike
Racer
Joined: Dec 2007
Posts: 312
Likes: 0
From: San Antonio Texas
At the least, you'll want a cam with about 220* intake/exhaust duration, 110* to 112* LSA, lift about .550" and valve springs (capable to about .600") to handle that lift. Then, top it off with a good mail order tune.
That will get you real close.....even with the stock heads.
KW
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
I was at 363rwhp with very mildly ported LT4 cylinder heads, LT4 HOT cam, Flowmaster cat-back exhaust, and an electric water pump. A little more porting and/or headers will hit your target with ease.
