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Dave Siltman · 12-29-2023, 04:02 PM

I’d suggest 1968-1969 #5 or 1970 #6 heads. You’re gonna need more than just a head swap to make 400 hp, though. I’d recommend a bit more compression, a respectable cam and valvetrain upgrade, a Performer RPM intake, a decent pair of headers, and a reworked Q-Jet. 400hp is achievable and if maintained and not over revved, should be stout and live quite a long time. You should be fine with a factory crank and rods (reconditioned) at that level.

12-29-2023, 04:02 PM	#3
Dave Siltman Junior Member Join Date: Mar 2011 Location: Maryland Posts: 72 Likes: 232 Liked 68 Times in 25 Posts	Re: Who can help with an Olds 350 head? I’d suggest 1968-1969 #5 or 1970 #6 heads. You’re gonna need more than just a head swap to make 400 hp, though. I’d recommend a bit more compression, a respectable cam and valvetrain upgrade, a Performer RPM intake, a decent pair of headers, and a reworked Q-Jet. 400hp is achievable and if maintained and not over revved, should be stout and live quite a long time. You should be fine with a factory crank and rods (reconditioned) at that level.