max psi on stock heads?
Thread Starter
On The Tree
Joined: Aug 2009
Posts: 106
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max psi on stock heads? in the middle of a turbo build and was gonna do a forged 5.3 with 317s for heads. i was told that if i wanted to run 14lbs of boost i would need diff heads because they will lift and blow heads gaskets from the thickness of the head being to thin. anyone have any luck running 14 lbs or higher with stock heads and it not blowing head gaskets every thousand mile?
Staging Lane
Joined: May 2005
Posts: 59
Likes: 0
From: Rio Rancho, NM
Mls gaskets lasted for approx. 3k+ miles on my set up 11-12 psi. A lot of spirited driving on it as a daily driver. Turns out I was hitting 17-18#'s overboosting and #7 cylinder side of head gasket leaked out.
LS9 head gaskets are on now on the same 317's and with a very mild tune I was spinning out on the dynojet to 922whp/860wtq on 91 octane no meth.
A good tune goes a long way literally.
LS9 head gaskets are on now on the same 317's and with a very mild tune I was spinning out on the dynojet to 922whp/860wtq on 91 octane no meth.
A good tune goes a long way literally.
Mls gaskets lasted for approx. 3k+ miles on my set up 11-12 psi. A lot of spirited driving on it as a daily driver. Turns out I was hitting 17-18#'s overboosting and #7 cylinder side of head gasket leaked out.
LS9 head gaskets are on now on the same 317's and with a very mild tune I was spinning out on the dynojet to 922whp/860wtq on 91 octane no meth.
A good tune goes a long way literally.
LS9 head gaskets are on now on the same 317's and with a very mild tune I was spinning out on the dynojet to 922whp/860wtq on 91 octane no meth.
A good tune goes a long way literally.
Slow93z, I think you would be safe under 20psi. I believe it also depends on your CR.
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Staging Lane
Joined: May 2005
Posts: 59
Likes: 0
From: Rio Rancho, NM
@gimmeluvin
8.5:1 cp's
72cc PRC stg. III 2.08/1.60 ported from TSP. (317's)
Comp 236/242 .610/.612 lift 114 lsa 12.5 degrees of overlap IIRC.
103# hi imp. injectors.
I really never intended to hit 18#'s. Was a mistake actually. lol.
13#'s for -DD
8.5:1 cp's
72cc PRC stg. III 2.08/1.60 ported from TSP. (317's)
Comp 236/242 .610/.612 lift 114 lsa 12.5 degrees of overlap IIRC.
103# hi imp. injectors.
I really never intended to hit 18#'s. Was a mistake actually. lol.
13#'s for -DD
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Verdad Gallardo nice dude, at what rpm do you see 13psi?
Staging Lane
Joined: May 2005
Posts: 59
Likes: 0
From: Rio Rancho, NM
lol. Yeah, after I read your last post again I realized that. 5k I am seeing 12-13#'s and no track times yet till I get a second vehicle. I can't risk breaking stuff right now. I still have 150 progressive NX system I am eagerly waiting to try out.
lol, thanks for the info. I better stop Hijacking this thread, someones going to get pissed. lol
I built hot parts for friends swap, it uses a tnetics tc78 and has seen over 15psi daily for about 2yrs now. It's a stock everything bottom
end, stock heads milled .005 ls9 gaskets.new stock headbolts. Hell it's got a cl find tq converter we found for 50$. It's using s rebuilt th350. Runs hard everyday no problems. Excellent SD tune and 60lb injectors. Also using a 100$ C5 intake manifold
end, stock heads milled .005 ls9 gaskets.new stock headbolts. Hell it's got a cl find tq converter we found for 50$. It's using s rebuilt th350. Runs hard everyday no problems. Excellent SD tune and 60lb injectors. Also using a 100$ C5 intake manifold
Staging Lane
Joined: May 2005
Posts: 59
Likes: 0
From: Rio Rancho, NM
Shoot for a HP/TQ goal. It's easier that way. Too many variables with boost. You can accomplish a certain boost goal but from my experience, the less air flow resistance from said parts the more power you can get per amount of boost.
Last edited by LSevil1; Oct 20, 2011 at 01:06 AM.
