Many a little 21 stud engine was cast aside in favor of their bigger brothers, 59a and 8ba engines, but the truth of the matter is they can be built into nice little street engines as Walt, Brian, and others have said, that will run their hearts out for you. Anybody who has ridden in my Avatar '35 Sedan can tell you how well it runs. This engine is basically stock except for 0.030" over bore and milled heads for higher compression. I'm not going drag racing with it, but it sure gets this old man anywhere I care to go and as fast as I care to get there
.