stock48

iTrader: (17)

Just wondering whos making big power with 241, 243, or 317 heads. How much RWHP, ET, weight, and boost! Thank's J

stevieturbo

camaroandreas is doing well.

BIG_MIKE2005

iTrader: (116)

I have seen several guys on here make 700+RWHP with stock cast 317 heads with just a good double spring kit.

stock48

iTrader: (17)

Cool He's running O rings correct? Anybody 1200+ on with factory, or MLS gaskets?

elias_799

iTrader: (8)

no o rings or 6 bolt head will not live too long at 12000whp.

you will need to be changing head gaskets like underwear

dudeman

iTrader: (43)

i am shooting for 1000 fwhp with stock 317's a spring kit and ls3 gaskets. i will find out soon enough

stock48

iTrader: (17)

Im running mid 9's @143+MPH in a 4900lb 4x4 truck with a set of 317's on 20psi I know it is probably on borrowed time just wanting to know what others are getting away with.

HydroStream6

iTrader: (16)

There's lots of guys making 900-1k hp on stock GM castings. I'm going to be pushing a set of 317s this year... hoping for near 1k fwhp myself. MLS gaskets and studs seems to do a pretty good job...

HydroStream6

iTrader: (16)

Oh and camaroandres is running a fire ringed block.

black98ws6ta

iTrader: (77)

Yeah, for 12,000 rwhp your going to need 12 bolt heads, lol. I agree with his post when you remove the typo.

My car made 920 rwhp on a mustang dyno in race form (29.5 tall slicks) on stock 317's

02blackbeauty19

iTrader: (22)

I make 768rwhp @ 14psi with stock 317 heads and dual springs

dudeman

iTrader: (43)

supercharged or turbo? what size turbo or supercharger? what motor?

02blackbeauty19

iTrader: (22)

APS twin turbo on an 347ci motor with a Dallas Performance stage II turbo cam and I also run meth injection.

slow67

iTrader: (2)

Harlan ran 8.1x at 17xmph with ported 317s
NA$TY TA dynoed at 1132rwhp with ported 317s
As mentioned earlier, camaroandreas dynoed (engine dyno) at 1360hp

COPO9560

Anyone got any numbers for L92 heads they could share?

stock48

iTrader: (17)

I think Im right up there with them. Not pushing water or anything, but sure seems like there is a lot of psi in the cooling system after I ream it good. Doesnt seem to do it below 20psi. Did they run long at this power level, any gasket problems?

dudeman

iTrader: (43)

what head gaskets do you run?

Avengeance

iTrader: (4)

I think now we know the 317s are up to it.... next question... what head gaskets are all the big HP/PSI guys using?

(Not trying to hijack but its a viable Q.)

HydroStream6

iTrader: (16)

From all the research I've done, the GM MLS gaskets are pretty damn consistent. I ran them for 4 years before and I'm running them again this season with my new heads!

NA$TY-TA

iTrader: (21)

We did 1132rwhp on the dyno at right around 25-26 psi.
S88 Turbo,370ci motor, stock crank, Ported 317's, MLS Gaskets,Patriot double springs, 224/220 cam. Thru a Powerglide and S60 rearend and 325/50's.

At the track it would run all day with out pushing water ie(lifting the heads, preasurizing coolant system) at 20psi. It ran a 6.27 1/8 @ 119, 9.26@150 like that.

On the 1132rwhp pull it pushed water on the dyno.
Ran it at the track like that... 5.89 1/8 @ 127 and popped the head gasket and rolled to a 9.7 @137. Race weight was around 3350#

Kyle