Heads?
05-27-2010, 06:31 AM
#1
Staging Lane
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Heads? so ive been reading of some of the gxp guys getting heads for there ls4's. my question is are they buying factory heads and porting them theirselves or is there an actual performance head out there? from what chevy has said the ls6 head will not fit the 5.3 ls4 so ya im gettin a little irritated with that, haha, any info will help. thanks
05-27-2010, 08:52 AM
#4
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See sittingmongoose's statement a few posts down...
https://ls1tech.com/forums/ls4-front...ng-boring.html
https://ls1tech.com/forums/ls4-front...ng-boring.html
05-27-2010, 04:03 PM
#7
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k last question, i need an opinion im going to do a custom exhaust, 2 1/2 inch piping, which do you alls think sounds better the magnaflow mufflers or the flowmaster 40 series? i like both, hate my indesiciveness
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05-27-2010, 04:06 PM
#8
But why limit yourself to those 2 mufflers? There are a ton of choices in the aftermarket.
05-27-2010, 06:28 PM
#9
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same style heads but smaller intake valve. The bigger intake valve will work but I haven't seen any data that supports a hindrance or gain in power. Yes, you do get the benefit of the bigger valve but the small bore increases shrouding sooooooo. But anyways, stock ported heads will flow pretty damn good, if you're adding a cam get them milled and up the compression.
05-27-2010, 07:32 PM
#10
same style heads but smaller intake valve. The bigger intake valve will work but I haven't seen any data that supports a hindrance or gain in power. Yes, you do get the benefit of the bigger valve but the small bore increases shrouding sooooooo. But anyways, stock ported heads will flow pretty damn good, if you're adding a cam get them milled and up the compression.
05-27-2010, 08:11 PM
#11
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Anywho. He's right. The bad part is they don't make kits for these cars. The good part is that they don't kits and you get to explore different routes. A lot of guys use spintechs.
05-28-2010, 12:22 AM
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No problem. Don't quote me on that though, haha.
FWIW, I have a magazine where they put larger valve heads on a 5.3 with a big cam, fast intake and long tubes, the made 458hp..........
FWIW, I have a magazine where they put larger valve heads on a 5.3 with a big cam, fast intake and long tubes, the made 458hp..........
