I have a RHS block bored to 4.165 and trying to figure out which crank size to use? 4.00. 4.125 or 4.250? This is my DD, and drive mostly freeway.

What suggestions do you guys have? I don't want to spin it to the moon either, that kills valve springs.

TIA

 

You could use the 4.125" easily, without issues.

 

If you're not planning on spinning it very high at all, I'd look into that 4.250 stroke crank and build a high compression ( pump gas friendly of course ), torquey as **** stroker motor!

I'm talkin about a stump puller! Something that'll yank your passengers molars or wisdom teeth out by the roots! Haha

 

Still have to figure out which length rod to use though.

 

Get the whole rotating assembly as a kit?

 

6.125.... a longer rod will have the piston pin 2 high or a really really short compression ht.