Is UT okay to put 305 heads on a 350?

Asked by Jan 14, 2015 at 09:59 PM about the 1980 Chevrolet C/K 10

Question type: Car Customization

My 350 has a cracked head and I have a spare 305 laying
around and I wanted to see if it was okay to bolt the 305 heads
on my 350

3 Answers

1,595

Yes, but the valve & combustion chambers are much smaller & maybe the intake & exhaust ports too. Nothing to gain by this only a little more compression & less hp. Alternative, have a cylindar head shop re-do them (valves, guides, valve springs,resurface) but it's going to be expensive. Cheaper to find & use 350 heads.

1,595

Search around cylindar head services weld cracked heads now with cast welding rod.

20,015

Don't do it. It raises compression and it will spark knock like hell if you don't run high octane and adjust for it properly.

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