What 335 is it
Junior User
Joined: Aug 2004
Posts: 81
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From: Huntsville, AL
one simple way is the bell housing bolt pattern on 351M and 400 are the same as a 460. a 351C has the same as a 302. some of the other guys can give you some more specific details but thats a quick way if the motor is out of the truck.
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
There is no 400M, it is a plain 400. The only engines with letter designations are the 351's.
Engine Identification:
======================
351C/M/400 335 series: 8 bolts in rectangular valve covers. Timing chain housing is part of block. Thermostat housing on block. Exhaust bolt holes diagonal.
351M/400 335 series: intake is 10.7" wide the 351C is narrow.
The difference between the 351M and 400 is the stroke and is internal. There is no identification from the outside.
Others:
351W/302/5.0L 6 bolts on trapezoidal valve covers. Thermostat housing on intake. Exhaust bolt holes horizontal.
429/460 385 series: 7 bolts in rectangular valve cover
352/360/390/427/428 FE series: Intake goes under valve covers.
Engine Identification:
======================
351C/M/400 335 series: 8 bolts in rectangular valve covers. Timing chain housing is part of block. Thermostat housing on block. Exhaust bolt holes diagonal.
351M/400 335 series: intake is 10.7" wide the 351C is narrow.
The difference between the 351M and 400 is the stroke and is internal. There is no identification from the outside.
Others:
351W/302/5.0L 6 bolts on trapezoidal valve covers. Thermostat housing on intake. Exhaust bolt holes horizontal.
429/460 385 series: 7 bolts in rectangular valve cover
352/360/390/427/428 FE series: Intake goes under valve covers.
Senior User
Joined: Apr 2002
Posts: 155
Likes: 0
From: KC Metro
If its a 351m/400 then they will appear the same on the outside, as Torque1st said. You'll need to measure the stroke
3.5" for the 351m
4" for the 400
If is a stock engine out of a truck then its a 351m/400 - 351c was never a pickup truck option, unless you consider the Ranchero a pickup:P
-Pentekno2
3.5" for the 351m
4" for the 400
If is a stock engine out of a truck then its a 351m/400 - 351c was never a pickup truck option, unless you consider the Ranchero a pickup:P
-Pentekno2
Junior User
Joined: May 2004
Posts: 79
Likes: 0
the carb is the easiest way to tell. with the whole 4v intake system & carb.. you need to check the stroke tho like they said. the cleveland has differend heads too, if you check on the inside of them you should be able to tell by the enormous intake valve. i dont know i might be talking out my butt so correct my guys if im wrong, but i think that would be the easiest ways. the 400 i think has a much smaller intake valve than the 351 because it was built in mind of the new emissions era. but again im not sure, if im not corrected i guess its right.
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Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
Originally Posted by 67fastbackfreak
the carb is the easiest way to tell. with the whole 4v intake system & carb.. you need to check the stroke tho like they said. the cleveland has differend heads too, if you check on the inside of them you should be able to tell by the enormous intake valve. i dont know i might be talking out my butt so correct my guys if im wrong, but i think that would be the easiest ways. the 400 i think has a much smaller intake valve than the 351 because it was built in mind of the new emissions era. but again im not sure, if im not corrected i guess its right.
BTW aussie 2v closed chamber heads don't have anything cast on the corners, and were actually used on 302 clevelands with 4 barrel intake cast iron (which is one way to run a 4 barrel carb on a 351c 2v engine using a factory manifold)
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Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
yep there is such a thing as a 302C it's an austrailian only engine (thus aussie heads), has a 3" stroke instead of the 351s 3.5", and I actually made one to race in the mud drags this last year till I blew it up. if you watch on evilbay, there is a couple of guys that sell the 6.03" long rods for the cleves, and/or the cranks for them.
and usually don't send guys to other sites but for some great info on these engines try. WWW.351cleveland.net and there is another one too that is mainly and aussie board, but if you go to tht site, and check on the links board you will find it.
and usually don't send guys to other sites but for some great info on these engines try. WWW.351cleveland.net and there is another one too that is mainly and aussie board, but if you go to tht site, and check on the links board you will find it.
