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If you have a big block bell housing then you have a 351M/400. If you have a small block bell housing then you should have a 302 or 351W.
I have forgoteen the measurement between the top two bell housing bolts. I think the SB is like 6 inches and the BB 8 inches but don't hold me to that.
In my opinion it is a good thing. I have 335K miles on my 94 F-150 ext cab. I did a rebuild at 245K still running strong and getting 17 mpg on hwy. It has been retired to the farm for farm use but just minor body rust is all.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.