I have a 455 with 6X heads that were on a Pontiac 350...unverified chamber size, as far as I can recall...it's been awhile since my engine build. Anyway, I guess the heads have been "mildly" worked over, whatever that would typically entail...valve job, etc. Is this head okay with a 455? I've had some pinging issues and had at least 3 people attempt to tune up this car. It starts okay, runs okay, just pings sometimes. That and a few people that have driven it have questioned whether it was actually a 455?! How embarrassing is that?!
So here's what the engine's got: 455 bored .030 over, "mild" cam (forget the specs at the moment), headers, edelbrock 750 carb, edelbrock performer rpm intake, k&n filter, "hot" plug wires, distributor recurve kit. Lower end has forged H-beam rods and forged pistons, new crank. How worried do I need to be about this pinging? Any pointers? I'm not much of a tuner but I know people who can help. I'm more concerned about having the proper heads installed for now. Am considering some aluminum heads if I ever get the cash.
I have a 455 with 6X heads. The 6x-4's come from a 350, thats what I have. The 6x-8's come from a 400. The 6x-4's are a good head for a 455. Try adjusting your timing or use higher octane gas.
Well kinda pi$$ing in the wind here (LOL !) but, as mentioned above you will need to run at least 91 octane premium gas. if still pinging retard the timing 2 degrees at a time until it stops. You may have to limit mechanical advance travel if you cannot get it stopped. What is your current timing? Can you post Initial, mechanical, vacuum. Manifold or ported vacuum advance? Yes detonation is a problem and is very hard on engines if left so you need to get it stopped.
