LS1NOVA

iTrader: (12)

psi or rwhp.

Looking to run a little more boost on my 5.3 with stock 4 bolt heads.

typhoon1015

iTrader: (5)

28psi, your good to go...

Boosted Firehawk

iTrader: (11)

what makes them 4 bolt heads

denmah

iTrader: (2)

stock blocks are 4 bolts per cyl.
LSXR ERL etc aftermarket are 6bolt per cyl

Beanslsxnova

iTrader: (1)

My 317's have seen 18lbs for the past few months and I haven't had any issues. I drive my nova to work everyday and beat the mess out of it. I'm not sure on how much timing he put in the tune but im on 93octane and meth. If that helps any.

helga203

I started to push some water after 24psi. I've been hitting around 30psi lately so this winter i'm going to try some ls9 gaskets. Already have arp studs but only tq down to 85 maybe i'll try to tq down to 90ish. I' already went through 10 gals of meth this summer. Over 1200whp

MaxxMitchell

iTrader: (15)

13-15 on a few set ups, so around 550-625rw. This is with the stock gaskets and bolts from the JY.

got-a-ls1

iTrader: (12)

maxx you lifted heads at only 15psi?

Chicago TDP

iTrader: (3)

I have been putting 18 PSI on my 4.8L for a couple thousand miles without lifting...

Ferocity02

iTrader: (60)

With stock head bolts and gaskets I'd start to get worried at 15psi, I've read of people lifting heads this early. LS9 gaskets and head studs will help.

got-a-ls1

iTrader: (12)

i have the regular 3 layer 5.3mls gaskets and arp studs no problems 20psi. well no problems ive noticed im taking this motor out here in a day or so ill check the gaskets... but always ran great

Orange99Z

iTrader: (25)

Timing plays a part in cylinder pressure too. You'll lift heads sooner with an aggressive tune.

I've only been to 11 psi on stock lq4 pistons, 70cc heads, ls9 gaskets, & arp studs. 21* timing, 93 pump & 100% meth. No problems yet

MaxxMitchell

iTrader: (15)

Stock long blocks, so stock 120-150k gaskets and stock bolts. With LS9s and ebay studs or ARPs, haven't pushed yet on 24-26lbs on the stock shortblocks and 28-30 on the built longblocks.

got-a-ls1

iTrader: (12)

ok so stock head bolts makes sense. haha im so tempted to try the ebay studs cuz im switching to a l33 block and i need the newer style studs but they scare me and ill just buy the arps

MaxxMitchell

iTrader: (15)

I used one set of the ebay 1997-03 ls1 studs, and they were iffy torquing to 75ftlbs, not even ARPs recommended 85ftlbs. For ~700rw hp builds and lower I wouldn't hesitate to use them with a set of LS9 gaskets if the budget is tight.

LS1NOVA

iTrader: (12)

This is what I was looking for.

Mine has forged pistons and rods, 3 layer mls, ARP studs, just ran it at the track at 23psi and 18 degrees timing and 12.0afr for 12 1/4 mile passes without issues but looking to make a little more power but upping the boost to around 28lbs and getting the afr back in the 11.7 range but dont want to kill it if I can avoid it.

Ryans99ls1

iTrader: (16)

i lifted the heads on stock ls1 head gaskets,stock heads and stock bolts. 9-12psi 19* of timing. ~600rwhp

put ls9 gaskets, 317s and arp studs in at 85ftlbs. didnt change a thing in the tune and its been perfect.

Johnmaster

iTrader: (3)

18 psi on straight propane and so far so good. hurled ~4700 lbs to a 11.95 1/4 mile whatever that works out to for horsepower. Truck block with all stock factory assembled 225K mile motor.

I8UR4RD

iTrader: (16)

599RWHP
17* Timing
stock 241's
9lb's at 6000rpm
stock headbolts
stock 10yr old gaskets
11.2 afr
methanol.

ittwgn

just found out recently from mechanic i was seeping coolant , i,m guessing only at the track 144mph @4050 pds, 20psi, lq9 iron totally stock 241 heads, arp head bolts, cometic gaskets !!!! i was wondering where that coolant was coming from haha thought i had a leak in a hose somewhere !!! in getting 0.0850 thick deck heads and head studs with new setup now!!!!