Horsepower limit [Archive]

Snowboat

11-02-2002, 04:42 PM

If I purchase some H beam rods, will I have to grind if I go to a 4.250 stroke, in a Mark IV block, with a .700" lift cam? Does anyone have any thoughts concerning the horsepower limit that a GM forged crankshaft can withstand? How about 7/16" rods with ARP bolts?
[ November 04, 2002, 09:39 AM: Message edited by: Snowboat ]

dossangers

11-02-2002, 05:59 PM

How much you got?

schiada96

11-02-2002, 06:47 PM

I'm running them with arp bolts, if I do it over gain I'll buy good ones. I believe I've got 900 hp.

Snowboat

11-02-2002, 06:48 PM

With the absence of a dyno, all I have is a desktop dyno report. According to that, I have 630 where hp crosses the torque curve (5250 rpm, I think). My rpm limit is intended to be 7,000. It shows 850 Hp and 640 torque. The engine is blown and I want to add a whipple intercooler this winter. According to desktop dyno, the increase would be 820 at 5250 and 1090 and 810 at 7,000. I doubt I'll have my foot in it for very long.

FLYTE RISK

11-02-2002, 06:59 PM

dont beleive anything unless you see it................................................ ......................... eek!

Fiat48

11-02-2002, 07:23 PM

Snowboat: Check your email. :p

dossangers

11-03-2002, 11:37 AM

Ive run my ls7 block crank for 8 years arp bolts on the rods spun it close to 9 grand all the time at least 50 bottles of nitrous over 1000 hp i had sonny bryant set it up originaly. I just cracked 2 cyl after all that time got a new merlin but still using orig. steel rods but the crank had a crack i got another steel chevy crank for the money there as good as any thing out there! :cool: :cool: