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B21 rods in 75 B20 engine 120-130 1965

posted by  Blue Horse on  Mon Nov 6 10:44 CST 2006
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last visit: Mon Apr 8 17:57 CST 2013
[RELATED]

I prefer the older B20s with the 6 bolt crank. (69-73) they always seemed to be of better quality, in terms of the block itself. 74s in particular are prone to rapid and uneven cylinder wear. I had a 75 on which the top deck of the block had warped out of true. Nothing like this ever seemed to occur in my experience with a dozen or so 6 bolt engines.

The 6 bolt engines rev better too, as the rods are lighter. They are still plenty strong---never had a problem with them as long as the bearing shells were in good shape and the oil pressure was adequate.

Perhaps the best combo is a 71-73 short block (don't know exactly why, they just seem to be more durable tahn 69-70) and a 74-75 head with the biggest valves ever used as original equipment and hardened seats from the factory.






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