Bounty

i just ripped apart my motor and was wondering how to tell if its a 351 or 302. i cant find 351 stamped on it anywhere, wondering where it is stamped if it is, how else i can work out if its a 351 and if aftermarket cranks have 351 stamped on them.

thanks

__________________
XF Ute. 351. LSD 9" 4wdics. Manual. Lowered. Tinted. All Elec. 16" mags. Huge "doof doof".

silicon

The stroke of a 302 is 3", 351 is 3.5". Put a ruler beside crank measuring the offset between mains centre to a centre of a conrod main.

Otherwide if it is a factory motor; go off the rod centre to centre length. 302 =6.030" and 351 = 5.7"

TruBlu351

If it has already been rebuilt, there's a possibility it's a 351 fitted with 302 rods with short deck pistons.

Just something else to check before making a snap.

Some poor bugger just posted that he found 7 x 351 rods and a 302 rod in his rebuilt motor!!

Give your crank a good degrease to possibly reveal the stamps.

__________________
XE Falcon
393 Tremec TKO 9"

jg66me

All 302C cranks have "302" cast on them. US 351 cranks will have "4MA" or "4MAB" stamped on the front web. All Australian 351 cranks have "351" cast on them.

Hope this helps

Steve

__________________
Cosmic Blue XA GT Hardtop,
Tropical Gold Landau,
Neptune Blue XC 5.8 Fairmont Hardtop,
Pine N Lime XC 5.8 GS Fairmont Wagon,
Apollo Blue 75 ZG Fairlane 50th Anniversary.
Brooklands Green 83 Capri Mk3 2.8i
Green EL Fairmont Ghia (The wifes).
Black BA XR6 Ute
Fordson Super Major Tractor
Fordson Super Dexta Tractor
Ford D1211 tray truck
Yes, I like Fords.

silicon

My brother's crank has neither 351, 302 , 4MA or 4MB on it. It is a 351 crank.

4Vman

it will be a late version american cleveland crank, they had no markings on them

__________________
F6: the fastest factory 4 door falcon in the world!

silicon

It has some the same size as the 4MA stampings and in the same location. I haven't wrote down what they are though. Motor is in/from a XB.

RPO-083

The 'better' US cranks were 4MA and 4MAB. Pretty sure the poverty packs had '2H' on them, but I can't be 100% on that.

Bottom line, if it has the capacity (302/351) it is Aus, if it has a code, it is US. Us never had a 302 clevo, so it will be a 351.

landau37

Hi what is the difference between 4ma and 4mab, also i see there is a 4mab crank on ebay that started at $250. becouse its out of a gt phase 3 do the gt ones have a mark on them to say they are gt.

xdclevo

I personally think they are all the same, including the std cast one, with 351 cast into it. I think they will all handle the same power, but back to the question.
How i see it is there is the 4MA crank, and there is 4MB which is exactly the same thing that had a hardness test, maybe as quality control?
Could be all crap, but all 351 cranks are strong. Fact.
Use what ever you can get cheapest is good condition.