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Old 03-16-2004, 04:08 PM   #1
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just a thought on rods

the 96-04 rods are crappy, simply put. at the neck at the small end, it gets narrower... i'm not sure why they actually made them smaller, but they did. we didn't bother measuring them because they really need to go if you plan on building building any motor, n/a or boost/n2o.

we took a look at 94-95 3.8 rods and they are not bad. they look at first identical to 351 rods. so... we measured stock 351w truck (cast) rods and were surprised to see them only be 5 thousandths wider and 7 thousandths thicker than the 94-95 rods. the 351 guys vouch for those rods up to 500rwhp, so for our 6 cyls that'd be somewhere around 400 for us. my friend is more knowledgeable than myself, but it's safe to say 94-95 rods are good to at least 350rwhp+ and the 351's to 400rwhp+. all in all, unless you're going just crazy with your 3.8, find some good used 351w rods and convert from pressed to float pin, shave the outside ridge off, and be happy... i doubt you'll ever break one. it'll save you several hundred if you decide to build a motor. forged 351w rods aren't cheap, and will last longer than the block will for sure. and you can have 351w rods drilled and polished off for cheap... the rods themselves are almost dirty cheap. they will be going in my motor unless i happen upon some forged that are a good deal.

and if you're not going to rev the crap out of it, a 4.2 crank will still hold up fine... i guess i'll make another thread about comparisons of 3.8 (blah) and 4.2 (nice) and SC (forged, real good!).
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Old 03-16-2004, 07:24 PM   #2
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351 rods are ~.080" longer too, don't over look that fact!

I could have told you these things but U never asked
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Old 03-16-2004, 07:28 PM   #3
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i was just sandblasting some intakes and piddling around a friend's machine shop. i want a machine shop!
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Old 03-16-2004, 08:57 PM   #4
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blast the rods too bead blast is best they say...
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Old 03-17-2004, 10:31 AM   #5
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If you are going to have the motor apart anyway and replace rods then I am guessing you will do pistons as well. Might as well just get the 351W Eagle I or H beam rods and get the pistons in the correct size to use them.

I know I wouldn't feel comfortable using a set of stock 94-95 rods shotpeened or not in a high hp/tq application.
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Old 03-17-2004, 12:45 PM   #6
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h beams seem a little like overkill to me, the block would probably crack long before those rods would. i am getting free block work and a friend will help me build it, and the budget is tight, so i'm thinking just a good 400rwhp capable motor will be fine. and yes of course i am going with pistons.
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