Tight Piston Clearance, Not Model A

[Dodge]

Also remember there are no water jackets in the lower part of a Model A Motor they need
the clearance. Those Keith Black pistons are amazing, they don't grow much.
When they were first coming out with them they gave us pistons to play with. We ran
them all over the board, first loose, they were ok at .003 but started making noise at
.0035 and they didn't quiet down when they warmed up. Then we kept making them
tighter and tighter they really seem to like .001 to .0015 and thats in a race motor.
I took a while to figure out that the top ring needed a lot more clearance and thats
how they run them now.
They are strong also, one motor dropped a valve and it when right through the piston
leaving a round hole, dropping the valve into the crankcase. The rest of the piston was
intact with the rings still on it still going up and down. Another motor lost a radiator
hose and got so hot it seized up when the driver lifted his foot off the gas. After
the car cooled down it was started back up and the pistons didn't make any noise.
When the motor was torn down later there were no scuff marks on the pistons. These
were in at .0025
There is a Keith Black 283 piston that fits and a hemi piston that also fits a Model A Motor.
So have fun and clearance is your friend.......