Ford 7500 engine

[mikewood869]

Anyone know if the head bolts from a Ford 7500 engine are 9-16 or 1/2?

 

[Old Ford Mechanic]

If you meant Ford 7600 engine the bolts are 1/2in -13. They are 4-3/4 long. Also; After a search i do see a Ford 7500 engine for a loader/Backhoe. It calls for 9/16in.-12 bolts 5 inches long and also 9/16in.-12 bolts 5-1/32 in. long.

 

[Destroked 450]

7500 industrial 73-75 used the same 256 turbo engine as on the 7000, also used on the 76-80 7600 but with a different head, intake, turbo and exhaust outlet
All of these used 1/2” head bolts, the change to 9/16 head bolts was in the mid 80’s on the 10 series

 

[mikewood869]

Thank you, it is for a 7500 backhoe. So up to the 80’s are 1/2. Would that be the same for a 755a backhoe or would that be depending on the block number? I’m looking for a spare engine down the road.

 

[Destroked 450]

755A could have either size as the change was sometime around 85 or 86
However if your looking at a complete replacement engine it doesn’t matter
Your main issue with a later replacement engine is the air cleaner plumbing, exhaust outlet and possibly the intake manifold if you use your exhaust manifold and turbo to correct those issues
Be aware Ford used 3 different intake port designs in the heads, 65-75 were smaller square port, 76-mid 80’s were oval port, mid 80’s up were large square port so swapping intakes around isn’t always an option

 

[mikewood869]

755A could have either size as the change was sometime around 85 or 86
However if your looking at a complete replacement engine it doesn’t matter
Your main issue with a later replacement engine is the air cleaner plumbing, exhaust outlet and possibly the intake manifold if you use your exhaust manifold and turbo to correct those issues
Be aware Ford used 3 different intake port designs in the heads, 65-75 were rectangular port, 76-mid 80’s were oval port, mid 80’s up were square port so swapping intakes around isn’t always an op

Didn’t know that the intakes were different. I know on my 83 6610 the ports are square. I thought they were all the same

 

[Destroked 450]

Intake gasket with red line 65-75
Intake gasket with blue line 76-80’s
Intake gasket with green line 80’s-90’s