1967 - 1972 F-100 & Larger F-Series Trucks
Discuss the Bumpsides Ford Truck
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Myself and some family members are getting ready to do a tear down and rebuild of the engine in my brother's 1972 F-250 pickup truck. We are having some problems identifying the engine displacement. I took a caliper and mic'd out the bore to be 4.050". I got the stroke to be 3.516". According to my calculations, this puts the engine at 360ci. I did the following formula to get that result:
pi * (4.05/2)^2 * 3.516 * 8 = 360.71
Is this correct or should I be looking at something else?
We have the heads pulled and the block is out of the truck on a stand. The numbers on the block where the casting number should be says "49 DIF". There are other miscellaneous numbers but no casting number that I can see. On the back of the engine, it has a 352 stamped and overlaid in yellow paint. I figure it's a FE block since we had to pull the valve covers and the intake manifold off before we could pull the heads off even though there is no mirror image 501 on the front. The heads are at a machine shop getting new exhaust valve seats installed since the original valve seats are gone. There was also something like 5 burnt valves as well. The pistons are black but they seem to be is good shape, and we can't feel any ridge in the bore. The casting numbers on the heads was something like a C8 or something, which points to 1968 heads? Did Ford use the same heads for different year vehicles? We are not the original owners of the truck.
What started all this is that the front main seal in the transmission blew out so we pulled the tranny to take a look and replace the seal, but we are not sure if we should take it to AAMCO or something.
So I am to understand that the C8 heads do not have hardened valve seats?
No they do not. Have your machine shop add them in. Then ask your machine shop if the valves are at standard height or are you going to need longer/shorter pushrods. New valve guides. Also a 3 angle valve job if you can afford. This is not necessary but nice.
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