239 bore.

[pooch]

Ronnie, thanks for good trick.

Frank, absolutely zero ridge , I cannot understand it on a standard bore.

Block is in shop now to get a guy to measure bore.

Have another Q, are (mushroom) intake and exhaust valves identical ?

I have a box of stainless valves that look almost new here.

Are these Ok to use in a standard block ? ie no hardened seats .

[Bored&Stroked]

Originally Posted by pooch

Ronnie, thanks for good trick.
Have another Q, are (mushroom) intake and exhaust valves identical ?

I've always seen different valves for intakes versus exhausts from the factory in all the 32-48 engines (from the factory). Now, I'm sure there are many cases where this doesn't hold up - but generally it was true.

With that said - I've taken apart many rebuilt flatheads where all sorts of intake versus exhaust combinations were used - so I don't know if it actually makes any difference. I don't know if there were different alloys or material properties between the two different valves from Ford.

Anybody know the details?

B&S