Casting numbers on engine block
Junior User
Joined: May 2003
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It's most likely a 390, as the 390 and 410 are the same bore, so use the same pistons. You have to measure the stroke, or look at the casting #'s on the crank to verify. a 410 will have the 428 crank.... and, oh yeah, a 410 would be externally balanced.
Posting Guru
Joined: Nov 2003
Posts: 1,888
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From: Iowa
if its a D3TE block it wont be a 410 or a 428 becuase it was a truck block,more than likely its a 360 but could be a 390, they used 410 pistons just to get rid of them. a D3TE block is a good block some can go .080 over to accept a 428 piston, i have one of them blocks.
Post Fiend
Joined: Feb 2001
Posts: 6,624
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From: Missouri
It is very likely a 390. Ford used 410 pistons in the later builds to lower compression. This was a cheap and easy way to do it but you can make it right. The 410 piston does not come up to the top of the deck. Optimally you want your pistons to come up to the top of the block. It can be dished or domed from there to determine compression ratio.
Post Fiend
Joined: Feb 2000
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From: Brea CA
D3TE blocks also like to crack between the freeze plugs, I've got one of them.
410 pistons were used in the 390 truck engines to lower the compression just like they used 390 car pistons in the truck 360.
410 pistons were used in the 390 truck engines to lower the compression just like they used 390 car pistons in the truck 360.
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