Lifetime Premium Member
Join Date: Oct 2017
Location: Traverse City, MI
Re: Stock 400 short block rpm limits
Several years ago my son grabbed one of my 400 short blocks and dropped in a Blazer. I had three at the time that were stock rebuilds (cast pistons, stock rods, cast rings) for when an engine was needed (his definition of needed is a lot lower than mine)! Take a 19-year old "young adult", add 400 cubic inches that belong to someone else, bolt on a set of rebuilt heads and upgrade the cam, then see how many 4-wheel burn out you can do! Despite my cringing, it held together @ 6,000 RPM on many occasions!
My son put about 15,000 miles on that engine that way before I got it back. Still had 55psi oil pressure, did not smoke nor did it make any funny noises. I cannot say they will all hold together that well, but that one sure did!