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Old 11-15-2004, 07:10   #1 (permalink)
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351c or 302c?

hi guy's first time on your forum it seems a top site,so here's my problem i've just bought a 351c (so i was told) but when i got it on to my engine stand and pulled the sump the crank has 302 on it,the casting number on the block is d2aeca which all my book's say it's an american 351c.

on ebay at the moment is a 302c crank,rod's and piston's(the rods are 6" long) from an aussie 302c and the seller is saying that it has been known for the 302c crank etc with the longer rod's and the flat top piston's the increase the torque and compression.

so what i need to know do any of you have casting number's that match the one on my block to see if it is a 302c or 351c and where it's from.

if it is an aussie 302c what kind of power are you guy's getting from them as none of the builder's in the uk have any idea,look forward to any help you can give
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Old 11-15-2004, 13:10   #2 (permalink)
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Re: 351c or 302c?

The blocks are physically the same. The crank casting is correct, if it says 302 that is what it is. The 351 has a 1/2" longer stroke and 5.7" rods to compensate. It has 351 on crank, maybe 4MA, 4MAB, or some other jiberish - these are typically American origin cranks.
The heads are different as well, closed chamber 2v for 302 and open chamber for 351 so they both ended up with around 9:1 compression.4v heads are around as well(can nearly put fist in intake ports)

Most people do not build up a 302c as the extra cubes of a 351c is hard to pass up, all of the extra torque. All you will need is a 351 crank, you can buy 351 pistons to suit the longer rod and you should have a set of closed chamber heads in your possession.

351c's will give you 300hp pathetically easy with the sky the limit for increases, money, money money.

What is it going in?
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Old 11-15-2004, 14:18   #3 (permalink)
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Re: 351c or 302c?

hi there cheer's for the info,it will be going in an 85 mustang(4 pot at the moment).
had a few people in the state's saying how good these block's are for building a race motor,measured the rod's on it today and they measure 6" center-center.
also removed the inlet manifold and there are a series of y's cast into it which i have been told confirm's it's an aussie 302c.

so that's all the info i have at the moment so it seem's i have a strong base to work from just need to find out how to get the best out of it.
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Old 11-15-2004, 14:21   #4 (permalink)
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Re: 351c or 302c?

here's the link http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT
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Old 11-15-2004, 21:30   #5 (permalink)
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Re: 351c or 302c?

Not all 351 cranks had 351 cast on them. Mine is free from all casting letters/numbers but on measuring is definitely a 351.
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Old 11-15-2004, 22:45   #6 (permalink)
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Re: 351c or 302c?

the engine builder that made my 302 clevo into 351told me that aussie motors had 302 or 351 cast into them and 4ma or 4mab cranks are better american cranks which is what i got from an importer.
i ended up using 351 crank, rods and heads although i was told later(hind sight is wonderfull)that i should have used 351 crank 302 rods with custom pistons and 302 heads cleaned up a little, the longer rod apparently helps the engine rev better i was told with a small loss in bottem end torque. heaps of stuff avail for these engines especially in australia
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Old 11-16-2004, 01:24   #7 (permalink)
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Re: 351c or 302c?

think i'm gonna work with this motor as i'm getting load's of praise for it.
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