2.20 rod in a boosted hemi

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by bobt, Apr 13, 2018.

  1. bobt

    bobt Member

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    has anyone had any experience running a 2.20 rod in the hemis. pros - cons
     
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  2. rb0804

    rb0804 Member

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    We ran a big block Chevy rod for a long time in the KB olds stuff and then in the 481x. We ran some high 5.40’s around 260 towards the end. Some where in the 50-60 range in the manifold for boost. We never had any rod related failures, the only real pain is you cannot but just upper rod bearings for the Chevrolet. If you lean on it you end up with a bunch of extra lowers.

    Not sure how you arrived at the 2.20, what the stroke is, and if the radius is correct after it was cut; these things will determine the strength of your crankshaft more so than the 2.20 rod.
     
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  3. bobt

    bobt Member

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    thanks for the reply, looking at a new callies 4.350 that is on racing junk . it was built in 2006 and never used it is a forged unit not sure how it will stand up compared to a billet.
     
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  4. rb0804

    rb0804 Member

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    We ran non twist forged cranks during that time as well. Never hurt one that wasn’t our fault. That being said, forged cranks are pretty tough and reasonably priced. I actually prefer them over billets as I feel the grain structure of the metal is better.
     
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  5. Bjs344

    Bjs344 Member

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    I run a 2.10 rod in a BBC going low 6s at 2100 lbs. I feel like when I switched from 2.2 to 2.1 the upper rod bearing got a little easier to knock tension out of. They will loose tension in 20 passes with no squish where the 2.2 I think I would usually see a little squish before they would loose tension.
     
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