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Well, that is good news, I was hoping it was the higher compression motor.

All the help you guys have provided is much appreciated........thanks. I now know what I have to start with.

That clears it up completely . Thanks !!!! I figured I had the 364, but that 4H was making me think 401. You have cleared it up completely. I also understand they had two compression ratios. ...

Thanks for the fast reply. As I mentioned , here is what was confusing me. According to the info below, 3H means 364 and 4H means 401. Why would an engine have BOTH numbers stamped on it ? ...

I don't normally play with Buick engines, but recently came by one and will use it for some future project down the road. My two sons and I build hot rods, leaning toward traditional hot rods, and...

I would appreciate any help in ID ing a 1961 Buick nailhead I am saving for a future project. It came in a 1961 LeSabre four door hardtop, and has a two barrel on it. The numbers stamped by the...