How much HP am I giving up?
#1
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How much HP am I giving up?
Due to budget constraints, I have to sell my TFS 215 heads and instead use some 241's I have that have a fresh valve job. Goal is 900 - 1000 WHP with twin BW's on an iron 347, LS6 intake, Martin cam etc.
I realize the obvious benefit of keeping my TFS heads, but I really need that money Ill get from selling them. How much potential HP am I giving up using the VJ 241's instead of the TFS, if say everything else besides the heads is the same at 20 PSI?
I realize the obvious benefit of keeping my TFS heads, but I really need that money Ill get from selling them. How much potential HP am I giving up using the VJ 241's instead of the TFS, if say everything else besides the heads is the same at 20 PSI?
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you can make up for it with the custom cam. But I was surprised at how much restriction my stock heads had in my setup. I was seeing 31# of boost on a 6.0L with an s475, which we know has to be boost "stacking"
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That what I was originally thinking, but with stock heads potentially lifting I will probably be limited to 20-22 PSI based on others results. So, Im limited with what I can make up for on boost with the stock heads.
#6
Not if u run head studs torqued correctly and LS9 Gaskets. I have it 25lbs on one or two occassions and no sign of lifting a head. My heads are 799 completely untouched. I do think 20-22psi with your set up will be super close to 800rwhp anyways. Dont sweat using the stock heads.
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Good to know man, I was under the impression stock heads dont do well above 20 PSI. I'll be using studs and LS9 gaskets so sounds like I might be OK with the 241's.
Last edited by schmendog; 02-05-2014 at 02:16 PM.
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#8
I think that is mainly because of too much compression, no headstuds or improperly torqued head studs, and not enough gasket. At least that is how it seems to me. I was 11.0 compression on stock 6.0 using the 862 heads untouched. I was pushing 25lbs and that was definitely pushing the limits but it still lasted 7 months. lol Oh and that was without an IC and NO meth injection either. Just pump E85 and a bad tune. lol
#12
But I believe what most are referring to when they talk of "lifting a head" is "pushing water" which can happen even with the proper clamping force, if there is high enough pressure to cause distortion of thin head decks on some heads.