Head swap between flathead engines - A QUESTION ????

Posted by Amateur Mechanic on September 05, 2001 at 14:26:56 from (209.47.89.126):

I have a flathead 4 cylinder engine that has a cracked head from freezing. It might be repairable but meanwhile I can get what appears to be a sound replacement head, but it is for a smaller version of the same engine block. My engine block has a bore of 3 1/4" and the replacement head has a bore of 2 3/4". All the head bolt locations and water passage openings are the same, it's just that the combustion dome on the smaller head is 1/2" smaller in diameter. This would be 1/4" in on the whole circumference of the combustion chamber. The valve recesses in the good head appear to match those in the original block. If everything but the bore matches up, can I expect to use the smaller head and have it function OK? I guess I might get an increase in compression ratio is that correct? My neighbour says that all the heads on small block Chevy engines are fully interchangeable, and that covers quite a range of sizes. Anyone out there have any answers to my questions?

Follow Ups:

• Re: Head swap between flathead engines - A QUESTION ???? lpc 08:52:18 09/06/01 (1)
  • Re: Re: Head swap between flathead engines - A QUESTION ???? Bob 20:15:48 09/09/01 (0)
• Re: Head swap between flathead engines - A QUESTION ???? Headguy 23:37:39 09/05/01 (0)
• Re: Head swap between flathead engines - A QUESTION ???? John Ne. 20:54:35 09/05/01 (0)
• Re: Head swap between flathead engines - A QUESTION ???? Jon Hagen 20:27:44 09/05/01 (0)
• Re: Head swap between flathead engines - A QUESTION ???? Gene Davis 19:50:13 09/05/01 (0)
• Re: Head swap between flathead engines - A QUESTION ???? Larry from Maryland 14:41:26 09/05/01 (1)
  • Re: Re: Head swap between flathead engines - A QUESTION ???? Bus Driver 15:50:26 09/09/01 (0)

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