Question: Assuming two engines make the same peak HP, what's more stressful on a bottom end? a) 7500 RPM with a 3.75 stroke (451) b) 6500 RPM with a 4.25 stroke (511)
Not meant to be a quiz; I'm curious about what's more likely to put the hurt to a marginal block.
Personally I think bob-weight will play a bigger hand than stroke - in the last 511 I built - we got the bob weight below 2200 grams using the 7.1 rod and a 4.25 crank in an stock RB block - I also believe in aluminum main caps. The first 511 stroker I built with stock rod journal and rod length had a bob-weight of almost 2500 grams - it beat the stock main caps to death even with studs.
If its a light weight assembly and well balanced and not running into detonation- 7500 RPM does not seem to make much difference
