Garys1969RR
Well-Known Member
Looking at the main bearing cap mounts on this 496 Block. Never seen cap walk before, but is there any sign of that here?
Studs will help as they are high strength and have increased clamping force. Girdles will also help stabilize the entire assembly and aluminum main caps can be added as well. Using a center counterweight crank will help if it’s a high RPM application. Lower reciprocating weight and a good balance job help. Simple things you can do, such as keeping the tune clean, and not detonating the engine are also key.Yea I was thinking that. Do you prevent that by using studs instead of main cap bolts?
Sure studs are best. What happens is the caps bounce. Keeping it out of detonation is the best thing you can do. Mine is 15-1. My bet is you should be running 112 or E85 fuel (I run 114). To much timing is a killer. Mine runs best at 32°. Even backing it down to 26° doesn't kill .10 in ET.Thanks dvw! May go to studs for the mains. That increases clamping force, right? This is a 13 to 1 motor, and I've heard hi compression engines are more prone to cap walk.
You must be used to the BBC chamber that needs 38-40 degrees NA. Damn! If you got a good cylinder head on that you’ll pick up some power even at that altitude.Oh, ok. I'm at 5400 feet, running 13 to 1 and 100 LL. I'll try backing off to 34 from 38 advance. See what that does.