200/250ci parts compatibility

[Kriek]

When I first purchased my Mustang 5 years ago, the PO stated that the engine was 200ci. I never gave it a thought until earlier this year, when a mechanic told me that the engine was 250ci. I understand that in 1969, Ford raised the 200's deck 1.66 inches, using the same 3.68-inch bore, and stroked the taller block to 3.91 inches to achieve 250ci. What I want to know is (1) when I buy parts (plugs, wires, ect) is it safe to say 200 specifications will work? The 250 is most likely out of a 1969-'70 Mustang, but (2) would it make a difference if it was out of a 19XX Falcon, Comet, Fairlane, Mustang, Maverick, Fairmont, or Zephyr?

 

[JB66]

Don't think 1.66" of deck height will bother anything.

 

[rbohm]

unless you are rebuilding the engine, or changing waterpumps, most of the parts interchange. you can tell a 200 from a 250 because the 250 uses a 4 bolt waterpump, and the 200 uses a 3 bolt pump. engine mounts are also 250 specific to a point. check out www.fordsix.com for more info. oh, if you have a 250, and you need to change timing chains and gears, they are also 250 specific as they are longer than the 200 chain.

 

[Hack]

I think you should determine for certain if it's a 250, and if so, just buy 250 parts.