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Ok so the guy I got this truck from said it had a 351 modified but when I run the VIN it just shows a 351, so by looking at the picture is there any surefire way to tell if this is a 351 modified?
Curiosity has finally gotten to me and I just want to know if anything can definitely identify a 351 modified?
Ok so the guy I got this truck from said it had a 351 Modified (351M), but when I run the VIN it just shows a 351, so by looking at the picture is there any surefire way to tell if this is a 351 modified?
4th digit of the VIN is the engine code. 1977/79 F100/350: H = 351M; S = 400.
If a 351, the VIN will only decode to a 351M .. because the 351W wasn't available in F150/350 & Bronco until 1981. Not available in any year F100.
351M/400 have 8 valve cover bolts per side. There is no timing cover per se, just a flat engine cover plate.
The fuel pump bolts to the left (drivers) side of the block, its bolt pattern is at 6 & 12 o'clock.
Hmm, funny I don't even have to think about details when I look to know the difference but another big one is where the thermostat is located. Not on the intake manifold is M engine. And slightly off topic the info to help tell a 351W from a 302 is also the thermostat. If you could reach the bottom thermostat bolt with a socket and extension, its a 351. If you could only reach it with a wrench, then 302.
Hmm, funny I don't even have to think about details when I look to know the difference but another big one is where the thermostat is located. Not on the intake manifold is M engine. And slightly off topic the info to help tell a 351W from a 302 is also the thermostat. If you could reach the bottom thermostat bolt with a socket and extension, its a 351. If you could only reach it with a wrench, then 302.
Sight misinformation there. Only the 351M is actually referred to as the "M". The 335 engine family also included the 400 ( a stroked 351M but technically not called an M even though many refer to it that way) and also the 351 Cleveland, or 351C. All part of the 335 series and all have the thermostat sitting down on the block.
Unless you want to call a Ranchero a pickup, no pickups were ever produced with a 351C.
Sight misinformation there. Only the 351M is actually referred to as the "M". The 335 engine family also included the 400 ( a stroked 351M but technically not called an M even though many refer to it that way) and also the 351 Cleveland, or 351C. All part of the 335 series and all have the thermostat sitting down on the block.
Unless you want to call a Ranchero a pickup, no pickups were ever produced with a 351C.
Don't forget the the 302C not a North American offering but still part of the 335 Series family.
Sight misinformation there. Only the 351M is actually referred to as the "M". The 335 engine family also included the 400 ( a stroked 351M but technically not called an M even though many refer to it that way) and also the 351 Cleveland, or 351C. All part of the 335 series and all have the thermostat sitting down on the block.
Unless you want to call a Ranchero a pickup, no pickups were ever produced with a 351C.
400 (1971) came first, 351M (1975) is a destroked 400.
10-08-2017, 07:47 PM
