ok stroker guru's, gig this one
A 4" stroker has less dwell time due to higher piston speed.
MT here's something to ponder.
The SB Mopar stroker that uses a 4" stroke and 6.123" rods has a rod ratio of 1.53"
The 454 Chevy uses a 4" stroke and a 6.135" rod for a rod ratio of 1.53"
So it seems the stroked Mopar is in the same range of a stock 454 Chevy and the 454 lasted good.