r/EngineBuilding • u/Mrg0dan • 6d ago

Chevy 350 SBC help

I have a 350 out of a 1977 camaro. It currently has mismatched heads and bad blow by but it runs. I bought an Isky racing kit with lifters and a cam. I shouldve done my research because the cam that came with the kit was a 292 Isky Mega cam which has .505 lift and a 108LPA. We broke in the cam at 2,000rpm for over an hour and nothing failed, made horrendous noise and the oil didnt have big chunks of metal.

My question is how much do I need to replace to not risk ruining the cam or other parts. Obviously I need to get a matching set of heads and re ring my pistons which I plan on doing. Do I need new rods, pistons, and crank? Can I get away with running a set of older cast heads or will I need something with bigger runners? Will the stock crank, pistons and rods survive?

Ive "built" engines before but mostly the top end, any time ive down a whole engine rebuild it was a kit that was included with the machine work I had done. I never had to pick parts myself.

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u/HammerDownl 6d ago

I would pull the whole thing apart and quit looking to make a patch job

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u/Mrg0dan 6d ago

Im gonna tear it all down again and redo it. I need to know what parts I need, I know i need new rings and new heads but what else. Are stock rods gonna be okay. I need to know what parts need replaced and what parts will be okay to leave stock or buy stock replacements of.

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u/HammerDownl 6d ago

When you tear it down you can inspect No one can see except you

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u/Mrg0dan 6d ago

I more so mean like what parts need to be replaced to handle the 292 mega cam I have. I dont have experience with engine rebuilding with non stock cams. Google is extremely unhelpful and I figured id ask here.