I have a 496HO (High Output) in my boat. 425hp at the prop.I dunno if you guys are into boats or already know, but Mercury gets its 496 blocks from GM, and I'm just wondering if anyone has thought about swapping parts with marine parts, since they are built for much more demanding use and higher horsepower.
No, have not had personally torn one down yet. I have seen as set of heads on a workbench, though. They had the standard stamped rockers (1.7 as BBCs have always been) and the non-adjustable studs/nuts. They already have guideplates, which is good.Pa32 have you been inside one of the marine engines?, reason I ask is I read in Boating mag that marine used forged steel crank and double row timing chain
May be mistaken again but doesn't the BB use 1.8 rockers? Or did GM drop to 1.7's?
Biggest gains, initially, have been on the exhaust side. Personally, I would get the airflow optimized on the outside before going inside. Changing the cam would not be near as usefull if it had to smack against the stock exhaust. Also if it couldn't pull the air through the intake.Jeez I knew better on the rocker ratio (note to self... stay away from posting at 2:30 in the AM)
My 8.1 is still bone stock, hopefully sometime in 08 I'll warm it up a bit, thinking about a cam and the neccessary ECM mods, probably not mess with the exh much unless really needed. I think there's a lot left in the tank vs. stock... 496 cubes should have no problem pumping 500 HP and boatloads of torque