Thank you for the input. I figured the head gasket blow out was due to high cylinder temperature. Bank 2,4,6,8 blew and bank 1,3,5,7 looked as if it was about to go between cylinder 3 and 5 When I pulled the heads off.
I am in southern Ontario and I feel the gas quality is good as I have never had an issue running premium in my modified forced induction vehicles. I was told by the machine shop the 193 swirlport heads that were on the boat are the same 64cc as the 906 vortec heads, they just would bolt on and...
Thank you.
The motor is a 1991 mercruiser mcm 350 i believe with a thunderbolt 4 ignition.
I read the plugs which looked to be ok but were still mostly clean, the plugs are acdelco mr43lts. The engine itself never overheated but I am assuming I had excessive cylinder temp .
I did not rejet the...
I put vortec heads on my gen 1 alpha one mercruiser 5.7l and it ran great until it didn't. I had no compression in cylinder 4 and 8. The head gasket had blown between cylinder 4 and 6 (burn though the middle )and the valves were tuliped in cylinder 4 and 8. After a trip to the machine shop I...
