i know this is the 3rd gen site but i have a 95 firebird with an lt1 and im gonna be parking it this winter and i wanna rebuild the motor, ive seen the lt4 kit advertised to make 430 horse.. anyone ever used this kit on a basicall stock lt1? does it really make 430 horse?> i have headers and exhaust thats about it and a cold air kit.. i wanne get the rebuild kit from summit with forged pistons or possibly a complete rotating assy. like the 383 kit from eagle.. would just any 1 piece rear main kit work for my lt1? and also maybe somewhere down the road after the 383 and lt4 kits maybe a super charger from vortech.. could my stock rods and crank take all that? with forged pistions of corse... and also is there a better package than the lt4 kit for basically the same price? like maaybe a set of afr heads and the edelbrock manifold and a different cam? im looking for all the info on this motor i can get and how to get the most power out of it... thanks guys!

 

Probably could find more info over on LS1tech.com or cz28.com on the LT4 kits.

 

It will make 430hp if its tuned right. Between my WS6 and my Dad's Comp TA, they were equal except I had stock intake and heads and he had the LT4 intake and heads. Best I did was 12.4 and the best he did was 12.2. His car also weighed 100 lbs less than mine. We dynoed the same day and I put down ~330rwhp to his ~370rwhp.

I know everybody says there are better packages out there, and they are right. But for a mild compo that makes power, it works.

And mine passed the IM240 treadmill test when it was emission tested

 

so what do you mean by tuned right? so how come his car olny put down 370? waht about some of the other packages that would work well?

 

370 at the wheels comes out to 425hp with a 15% drivetrain loss. 436hp with 18% loss. Right where its supposed to be.

Tuned with LT1 Edit or somebody that knows how to tune the LT1.

 

You should look into Lloyd Elliot heads. Most guys with the LE1 heads and LE2 cam are in the 400RWHP range.

http://www.eportworks.com/lt1.html

 

or go with GTP this is who i use

http://gtp-racing.com/

 

www.victoryracingengines.com