Homemade Headers
naw.....screw them f-bodys...i think a ls4 with just a good set of shorty headers and half way decent intake would be a damn nice gain and with a speced out cam you guys could have them little buggers throwing down 360+ if only anyone with one was close and had maybe 300 to throw into some gettho r@d i bet i can mak a sweet *** set of shorty headers that put out. **** + some texas speed 5.3 2.5s on them bitchez would be sweet too....
i think the way to make power on these get some heads that have the intake bolt pattern that the g8 gt has and get one of those manifolds...
as far as making things, this winter ill be working on making a bigger crossover and see if that helps anything im jobless right now though so i dont have any extra money for parts
as far as making things, this winter ill be working on making a bigger crossover and see if that helps anything im jobless right now though so i dont have any extra money for parts
Thread Starter
TECH Fanatic
Joined: Feb 2009
Posts: 1,401
Likes: 1
ya we good decent factory 243 heads. But Damn them texas speed 2.5 heads have been rocking the local f-body guys. most them are like 420-450 with a simple H/C and Fast inatake. then over 500 with some N20
TECH Fanatic
Joined: May 2008
Posts: 1,769
Likes: 0
From: Fargo, ND
No it's because they designed it with the oil pressure sender in an unfortunate/restricting location to save money and not have to engineer a whole new block since that is the standard location for ls1/2 etc engine blocks...
Another possibility would be to use a larger downpipe than 3 inches or dual 2.25s that y back together later on or something.
Another possibility would be to use a larger downpipe than 3 inches or dual 2.25s that y back together later on or something.
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Also like the idea of mounting the pressure sender down by the filter...this guy may be on to something.
Staging Lane
Joined: Jun 2009
Posts: 69
Likes: 0
From: Carmel, IN
The only issue is the cars that had the 3.8 L67/L32's had more room in the engine bay than we do. Your right about using them as a guide and having the cross over pipe connect into the down pipe. This would allow the transfer of exhaust to more faster and open up the LS4 for better performance.
The only issue is the cars that had the 3.8 L67/L32's had more room in the engine bay than we do. Your right about using them as a guide and having the cross over pipe connect into the down pipe. This would allow the transfer of exhaust to more faster and open up the LS4 for better performance.
Staging Lane
Joined: Jun 2009
Posts: 69
Likes: 0
From: Carmel, IN
From what I'm reading, the two major issues with LS4 performance is intake and headers. Now, we have good heads and a decent cam...honestly, if the engine won't flow to it's maximum potential with the stock cam, there's no reason to upgrade until these two items are taken care of. Now, the LS6 manifold thread seems to have died for the time being, but from what I read the main problem was the oil pressure sender, am I right? What else was a big deal? TB mounting?
GM put a ******* V8 in with a V6 thinking exhaust. Not the best thing in the world.
Sorry, but you can have the best cam and heads in the world, but if the intake/exhaust manifolds are as restrictive as the ones we have now then by opening them up ( headers or even ported ) you will allow better air flow which in return will allow more HP due to the bottle neck of the exhaust problem we have now.
GM put a ******* V8 in with a V6 thinking exhaust. Not the best thing in the world.
GM put a ******* V8 in with a V6 thinking exhaust. Not the best thing in the world.
The only problem i have with all of this is that i ported everything out, did a new exhaust and cold air and only saw a gain of about 20hp. So i am thinking if we did manage to created headers and or intake manifolds, we would not gain much. MAYBE 15hp if we did both