dimetweaker

iTrader: (1)

Just curious what I could safely run for lift on stock L92 rocker arms. The new cam I bought is .624/.610, wondering if its going to be an issue down the road?

Rock_Daddy

iTrader: (8)

Im running a .625 .625 on them. (or .624 .624 can't remember)

dimetweaker

iTrader: (1)

how much time on the motor thus far?

Rock_Daddy

iTrader: (8)

61 runs in the mid 9 second range and the dyno pulls to turn her. Running through the traps at 7200rpm.

dimetweaker

iTrader: (1)

uff da! sounds good enough for me!

PwrdbyLS1

iTrader: (5)

Normally, max lift on stock rockers is .550" if you want to keep your guides perfect but a lots of people run them over .600.

dimetweaker

iTrader: (1)

even for these specific heads compared to other LS stuff? I think they are something like .510 stock arent they?

all I would need to do to save the guides is aftermarket rockers right?

PwrdbyLS1

iTrader: (5)

Yes, aftermarket roller rockers.

Old SStroker

...and more spring to handle the heavier (higher MOI) aftermarker rockers, and stiffer pushrods to handle the extra inertia loads from the heavier rockers and the stronger, heavier springs.

And the beat goes on...

dime, if your valvetrain parts are correctly matched, the lift you mentioned will work with stock rockers. Not everyone matches valvetrain parts correctly, however.

My $.02


Jon

NemeSS

iTrader: (127)

have gone to .650 lift cams on stock rockers with correct pr and springs
7k shiftpoints

TJ

iTrader: (10)

upgrade to roller trunions when you can. stock needles will spit out on you before its over with.
i ran a set of modified stock rockers for hundreds of 1/8 mile passes and on the street.
still running on the motor i sold them with.

gnx7

iTrader: (28)

I had a 233/239 .600" lift cam and did around 20 1/4 mile passes shifting at 7100rpm, at least 6hrs worth of WOT road racing, and 20K miles total (street/racing etc) with zero issues on the stock rockers. The engine supposedly had 23K miles when I installed the cam and AFR 205's. I would spend the money and at least get them rebuilt for peace of mind.

1989GTA

"...and more spring to handle the heavier (higher MOI) aftermarker rockers, and stiffer pushrods to handle the extra inertia loads from the heavier rockers and the stronger, heavier springs.

And the beat goes on..."

Yep, sound advice.

VortechC5

iTrader: (6)

Not to steal the thread but that is a cool LS Vega! I have a couple of small block Vegas in my past.

LS1BLKSS

iTrader: (36)

+1 they held up pretty well

dimetweaker

iTrader: (1)

alright, well the PR and springs are already taken care of so i guess ill just roll with the stockers for a while and consider upgrading later. Thanks everyone for the input.

vettenuts

iTrader: (4)

If you are using stock rockers, how much time are you spending on setting the geometry or are you just bolting them in?