Stock Head Gaskets/Bolts good to what PSI?
09-05-2006, 09:26 PM
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Stock Head Gaskets/Bolts good to what PSI? Like the title says. Im going to be running a stock LQ4 till I get my 418 back up to snuff and am wondering how much boost I can push on the stock setup without lifting the heads or blowing a head gasket. Anybody got a good guesstimate/experience?
09-05-2006, 10:49 PM
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I know for sure I can get 12 out of stock stuff, couple of truck guys are getting away with it. Hopin I can hit 14/15 and not run into problems
I may pull my arp bolts out of my 418 and put on the 6L, my cometics off the 418 are for a 4.030 bore
I may pull my arp bolts out of my 418 and put on the 6L, my cometics off the 418 are for a 4.030 bore 
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09-06-2006, 04:14 PM
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ive "heard" of up to 15 psi on stock crap...but i would never recommend it without arp head bolts/and decent new gaskets...personally i think we can get away with close to 10psi if you have new stock gaskets/bolts in....if its old stuff it will obviously tend to be weaker because of the wear and tear over time...
09-06-2006, 05:28 PM
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CR=9.4 Gas=93oct
Ok so with this setup what can I hit?
LQ4 6.0
317 heads
ARP Heabolts
Cometic 4.030 bore headgaskets
ARP rod bolts
turbo cam everything else stock
Air will be intercooled and be spraying some meth. Boost on and off the meth?
Ok so with this setup what can I hit?
LQ4 6.0
317 heads
ARP Heabolts
Cometic 4.030 bore headgaskets
ARP rod bolts
turbo cam everything else stock
Air will be intercooled and be spraying some meth. Boost on and off the meth?
09-06-2006, 07:37 PM
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Anybody else? I may spray it some too. That will obviously bring the cylinder pressures up pretty high but the nitrous will be used to spool it out of the hole for the most part.
