Reply With QuoteI appreciate all the input. I'll see Russ tomorrow at the lake. I think the forged pistons are the first step and checking the fuel delivery seems to be next!
running hard for 5 minutes and cast pistons is a death sentence. When merc designed this engine they didn't design it for use with a supercharger. If your friend wants to continue to run it hard he should have both engines gone through. Put forged pistons, inconel exhaust valves and all the rest of the good stuff in them. Also, after he has them rebuilt, have someone tune the engines on the water with a laptop and an air/fuel ratio meter. This is very important as there will probably be some lean spots in the fuel curve. One company that does alot of efi tuning isGT PERFORMANCE in Montclair Ca. Their # is909-982-8391. Ask for Gary. He has been doing efi longer than most.
I appreciate all the input. I'll see Russ tomorrow at the lake. I think the forged pistons are the first step and checking the fuel delivery seems to be next!
My old 383" chevy with a whipple tuleped the valves from the knock sensor backing timing out of it and heating the exhaust up.
i had a 383 with the same problem on a NOS .ring ends butted together and pops the top off the pistons and the pistons were forged,run a larger ring gap and never look back.has nothing to to with cast.hyper or forged pistons i had 350hp shot on cast pistons for 2 years and never hurt a piston in a stock rebuilt 350 with cheap rings
later
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