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Old 02-24-2005, 03:08   #1 (permalink)
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351/302 Cleveland.. What bits?

I have two complete motors, a 351 and a 302..

What pistons, crank, rods and heads should I use from which have what effect .. I only want one workin motor...

My guess is 302 rods with 351 crank and 302 heads... etc

I like revs, but am willin to sacrafice if I can make extra power by increasing the capacity....

Anyone know plenty about this to inform me of the best combo?
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Old 02-24-2005, 03:26   #2 (permalink)
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Re: 351/302 Cleveland.. What bits?

You won't increase capacity. You need to run a stroker crank to do that. 302 rods supposedly are good for a few more rpm than 351 rods. Use the 302CC heads.

I run 351 rods/crank and rev it too.

Brenden
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Old 02-24-2005, 04:03   #3 (permalink)
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Re: 351/302 Cleveland.. What bits?

Quote:
Originally Posted by brenx
You won't increase capacity. You need to run a stroker crank to do that. 302 rods supposedly are good for a few more rpm than 351 rods. Use the 302CC heads.

I run 351 rods/crank and rev it too.

Brenden

As I understood the longer 302 rods mean longer at TDC and hence slightly more power (same as old trick of putting pistons in backwards). Seems strange to me that ford would design the 302 rods stronger even though they are longer hence more reciprocating mass (which really would be 2/5s of fa).

With heads this is still something I am baffled by, as I understand there were only 4 std heads ever made 2v or 4v open or closed chambers. I presume that when people recommend 302 heads that they are recommending 2v closed chambers for more comp and more reasonable ports. Is this the case?? If this is then head selection would depend on pistons available to suit the longer 302 rods.

Am interested to hear comments
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Old 02-24-2005, 04:08   #4 (permalink)
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Re: 351/302 Cleveland.. What bits?

Thats the case with the heads. With a cams thats got about 230 or so @50 you can run 302 rods with flat tops without issues but it's very borderline. 2V CC head is a better street head that does well on the strip. The 4V CC head is better for the strip and not the street. Is the common concensus.

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Old 02-24-2005, 04:46   #5 (permalink)
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Re: 351/302 Cleveland.. What bits?

Quote:
Originally Posted by blackxbhardtop
With heads this is still something I am baffled by, as I understand there were only 4 std heads ever made 2v or 4v open or closed chambers. I presume that when people recommend 302 heads that they are recommending 2v closed chambers for more comp and more reasonable ports. Is this the case?? If this is then head selection would depend on pistons available to suit the longer 302 rods.

Am interested to hear comments
Not if you have 351 crank and rods, with 302cc heads. This stills seems most popular.
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Old 02-24-2005, 04:53   #6 (permalink)
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Re: 351/302 Cleveland.. What bits?

Cool, thanks for that.

Whats the story with the rods? I have seen your past posts so its obvious you know what you're talking about. I didn't bother with 302 rods when I built my motor years ago as I was lead to believe that you had to buy pistons with the gudgeon pin higher in the skirt, which weren't easy to come by back then.

But if the rods are stronger then the double whammy of more power and more revs deserves a serious rethink as I am planning to do a piston change for turbos down the line anyway.
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Old 02-24-2005, 06:05   #7 (permalink)
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Re: 351/302 Cleveland.. What bits?

It seemed a few years ago the 302c rods seemed to be the rage. On the other hand, i have come across good articles where of very recent times, some of the top engine builders are now going back to the shorter rod.
I believe there is little difference in it really, with slight benefits both ways.
I too went the 351c rod, because they came with the crank. It made it an easy decision.
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Old 03-01-2005, 05:38   #8 (permalink)
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Re: 351/302 Cleveland.. What bits?

Well That helped alot. I am still at square one... I am still confused heh... I have a 302 and a 351... So using 302 Heads and keep everything else 351cc I'll make a little more power??

What if I used 351 crank, with 302 rosds? Do I need new pistons? (probably need new pistons anyway)
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Old 03-01-2005, 15:56   #9 (permalink)
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Re: 351/302 Cleveland.. What bits?

Black XB-I don't think the 302 rod is actually much stronger its the rod aspect ratio that allows for higher revs due to less stress on the rod and reduced load placed on the bores/piston skirts, obviously reduced friction increases max rpm and power.

Bottom line is that you will need to spend up on good valves, valvesprings and roller rockers that are needed for a "I like revs" type of motor. Std rods are good for 6k easy and with (stock)2v heads you won't be making power much above that anyway and with the std rod you have good low end TQ. If you have the money then go for 302 rod personally I don't think it really matters. You won't be sitting on 6000rpm all day but if it was going to be raced or doing heaps of burnouts then consider it.

I think you will need to open up the closed chamber 2vs otherwise your comp will be too high.
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Old 03-02-2005, 20:41   #10 (permalink)
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Re: 351/302 Cleveland.. What bits?

Quote:
Originally Posted by MakoZH
Well That helped alot. I am still at square one... I am still confused heh... I have a 302 and a 351... So using 302 Heads and keep everything else 351cc I'll make a little more power??

What if I used 351 crank, with 302 rosds? Do I need new pistons? (probably need new pistons anyway)
Ask 10 people and you will get 10 answers. Work out who you trust the most and pm them for some help.
I would use the 351 crank/rods and 302c heads. Easy.................
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