Advantage of 5.3L heads in an LS1
04-01-2007, 06:58 PM
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hey batman, just like they said buddy, they increase compression by decreasing the cc chamber size over the stock heads, and they do flow well with a good port job, you need to update your pic since you got your new rims
04-01-2007, 09:47 PM
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Originally Posted by 02silvaZ
man something is wrong because it is showing no replies to your question but when you click on it you can see what everyone has wrote
i'll work on getting a new sig pic, but i'm gonna have to have someone on here do it for me, cuz i cant! someone on here did mine that i have now. i need to get some pix of the berger panel and the rims and have that as my sig pic. one day!
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04-02-2007, 10:10 AM
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Anyway you look at it, the 5.3 heads will make more power with the stock cam or aftermarket cam. Especially if you have them ported and go bigger vlaves. You get .5 extra compression and they flow much better than the 5.7 heads, or at least most of them. I was very happy with mine.
04-02-2007, 06:31 PM
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Originally Posted by Tainted
5.3's raise the compression for some more power and they can be ported out to flow pretty good. im going with the 5.3L stage 1.5 heads in my TSP heads/cam package
04-02-2007, 09:16 PM
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Originally Posted by ssbodyman
Anyway you look at it, the 5.3 heads will make more power with the stock cam or aftermarket cam. Especially if you have them ported and go bigger vlaves. You get .5 extra compression and they flow much better than the 5.7 heads, or at least most of them. I was very happy with mine.
04-02-2007, 09:23 PM
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I think I saw somewhere that the 5.3 heads only flow slightly less in stock form...ported would flow better. I think they have smaller valves, though (stock).
04-02-2007, 09:24 PM
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The only benifit of a 5.3 head is that the chamber is smaller, thus giving a slight bump in compression. Both 5.7 and 5.3 heads flow well when ported/polished.
04-02-2007, 09:33 PM
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Just slapping stock 5.3 heads for pumping CR will hurt the power since flow is less because of smaller intake valves. Exhaust valves are the same on both 5.3 and 5.7 heads.
I know some people who just slapped the 5.3 heads thinking they wil be better with higher CR while flow is worse than with 5.7 heads.
I know some people who just slapped the 5.3 heads thinking they wil be better with higher CR while flow is worse than with 5.7 heads.
04-02-2007, 11:11 PM
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Ok so now i am confused do they flow better then the 5.7 heads or not, if they are both ported and polished? Also what kind of price am i looking at to get 5.3 heads ported and polished? Looking for anyone with proven results.
04-03-2007, 05:01 AM
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Originally Posted by Tainted
i think so. im going with the TSP stage 2.5 5.3L ported heads. they come with 2.04 intake valves and 1.575 exhaust valves so they probably flow pretty good. either way its a nice compliment to a new motor and the 228R cam!