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:surprise: My wife bought this 1956 Ford Ranch Wagon restomod from the builder in Florida. We are having work done to replace the rotted out front crossmember. Smoke was coming out of the distributer so we dropped in the HEI electronic ignition system for the Ford 302. That did not mesh with the oil pump gear. Further investigation reveals that the block is identified by serial number as a 1974 Ford 351 Windsor. The HEI ignition system for the 351 fit perfectly as a drop-in replacement. The heads are from a Ford 302.

Why would anybody install 302 heads on a 351 Windsor???

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302W heads and 351W heads are the same. They are interchangeable.
 

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302W heads and 351W heads are the same. They are interchangeable.
That's not exactly right. 302 uses 7/16" head bolts and 351 uses 1/2". To put 302 heads on a 351 the head bolt passages have to be drilled to allow clearance for the larger bolts. Otherwise, yes they are physically the same.

Jeff
 

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I have to confess, no matter what kind of heads are on the car, she is stunning!! What a great color too.

Congratulations on a great find, she is a really wonderful looking car! Good luck with her.

Regards,

Steve
 

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That's not exactly right. 302 uses 7/16" head bolts and 351 uses 1/2". To put 302 heads on a 351 the head bolt passages have to be drilled to allow clearance for the larger bolts. Otherwise, yes they are physically the same.

Jeff
Early 351W blocks use a 7/16 head bolt. I have a '69 block in my basement.

I don't remember when they made the upgrade, but I think it was somewhere in the late 70's? '79, or '76 - I can't remember.
 

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Early 351W blocks use a 7/16 head bolt. I have a '69 block in my basement.

I don't remember when they made the upgrade, but I think it was somewhere in the late 70's? '79, or '76 - I can't remember.
So in other words it gets complicated! :grin2:

Jeff
 

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She’s a beaut!
 

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Discussion Starter #12

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What casting numbers are on the heads? I've swapped GT40P heads from a "5.0" (302) onto a 351W bottom end to gain compression and they actually flow pretty decent for torque production on the larger cube engine in an old pickup - as mentioned I had to drill out the bolt holes... they're a bit restrictive for higher end HP but in this case it didn't matter much because I wasn't going to spin the engine more than 5-5500 tops and the cam was out of steam around 5200.
 
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