stock displacement rebuild w/ h/c swap
10-13-2005, 05:54 PM
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stock displacement rebuild w/ h/c swap hey guys im new to this ls1 world. im currently working on a build for my buddies car. im a mechanic and also very into lt1's. but i will be buildng a stock displacement ls1.
i'd like to run higher compression from stock, and use the t-rex cam, along with either a set of 5.3 heads or something comparable. but once again im in the dark here as far as ls1's go. i've searched but can you enlighten me on what heads to look for? i want arond 450 rwhp. as far as intake manifold? will i be ok w/ say an ls6 intake manifold or would it be worth it to get the fast 90/90. also i'd like to replace the factory pistons w/ a forged set. i'd like to keep it close to stock displacement, not touch the crank, and swap out the stock rod/main bolts for arp's.
thanks guys,
Steve.
i'd like to run higher compression from stock, and use the t-rex cam, along with either a set of 5.3 heads or something comparable. but once again im in the dark here as far as ls1's go. i've searched but can you enlighten me on what heads to look for? i want arond 450 rwhp. as far as intake manifold? will i be ok w/ say an ls6 intake manifold or would it be worth it to get the fast 90/90. also i'd like to replace the factory pistons w/ a forged set. i'd like to keep it close to stock displacement, not touch the crank, and swap out the stock rod/main bolts for arp's.
thanks guys,
Steve.
10-13-2005, 06:20 PM
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your right in keeping the stock crank it can take a lot of power before it breaks. The t-rex cam will be hard to get to idle compared to most cams for ls1's but can be done. Look into AFR heads or you can go with patriot performance heads that are cheaper. If your firend has a 2000 or older ls1 get the 90/90 set up, as the 01-02 already had the ls6 intake. as far as heads what do you want the car to do have more power down low or up top, as truck heads usually lower compression.
10-13-2005, 06:54 PM
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the car is not a daily driver but does see street time. how much power can be made w/ that cheatr camshaft? as far as heads i would like to get heads that would flow well enough to support a healthy dose of N20. which heads can i use w/ the t rex? i know that PTV is very close, and want to run a forged piston that can handle the power of a n20 blast, and raise compression somewhere around 11.5 or 12.1, i want atleast 450 rwhp. i need to know what parts to get, as far as pushrods, rockers, etc.. im very new to the ls1 world like i said and dont know whats good and whats not, i've tried searching and reading thru handfuls of articles and just figured i'd make a post. the engine is from a 99, as far as intake i wanna make power no doubt, but would like the most cost efficient way to put down upwards of 450 hp.. if it takes the fast 90/90 i'll do it but if the ls6 can flow, i'll use that. do i need to get new lifters or can i use replacement lifters? as far as valve springs how are the behivees? or patriot dual's?
thanks again,
steve
thanks again,
steve
10-13-2005, 06:56 PM
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ps- i plan on upgrading to ls6 oil pump, and arp rod and main bolts - is there anything else you can think of that i'm missing? other than a timing chain? whats good there double roller?
10-13-2005, 07:59 PM
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as timing chain get the ls2 chain its cheap and works very well. If you go the 90.90 route get the nick willialiams throttle body as it is better.
you could just get the t-rex, stage 2 ls6 heads from patriot performance, new timing chain, cromoly pushrods, and a dry shot and you would be very close to 450 and not have to raise the compression. just forge the bottom end so you can spin higher rpm's. high compression and n20 blast could get hairy, as n20 leans out the car.
you could just get the t-rex, stage 2 ls6 heads from patriot performance, new timing chain, cromoly pushrods, and a dry shot and you would be very close to 450 and not have to raise the compression. just forge the bottom end so you can spin higher rpm's. high compression and n20 blast could get hairy, as n20 leans out the car.
10-13-2005, 08:02 PM
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my car is dynoed on a mustang dyno w/o heads or a dry shot. the t-rex is a bigger cam tham mine and alone should put down around 400 rwhp. the powerband doesn't kick in the t-rex till about 4,000 rpm's and mine is there at 2,300 or so. If ya want to spin your motor to 8 grand the t-rex is for you if not I would look around a bit sometimes #'s under the curve are more important.
10-13-2005, 08:25 PM
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Get AFR heads 205s, milled to 59cc, w/comp 921 springs, .045 cometic gaskets and your real close to 11:1 compression. LS6 intake is fine, go with rollmaster double chain, ported ls6 oil pump and u/d pulley. go with LG G5x3 @114 lsa and youll be 450-460rwhp range.
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10-15-2005, 12:31 PM
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ok thanks guys.. another thing that i've been thinking about is what would be the best way to raise compression? i'm planning on forged pistons. should i get pistons to raise comp ratio, or mill heads? and how far can i go before i run into ptvc w/ the trex or similar camshaft. and i've read not to use 1.85 rr's at all w/ that cam why is this? also with upgrading to the ls6 oil pump, ls2 chain, and arp rod/main bolts - and obviously a piston change.. would i be able to spin this bottom end high enough to get the potential out of this t rex or similar camshaft?