Some advice on 8BA pistons

[Diavolo]

Pistons should be matched to the stroke. The rod is the same and the crank stroke will push the wrist pin higher in the bore. If you are using a 4" (255) crank, you need the matching pistons for the 4" stroke. If you don't, you will have a bad day.

If you look at the selection from Summit Racing, you will see that the only stroke offered is 3.750. Here is the link. http://www.summitracing.com/search/p...rd-flathead-v8 You need pistons for 4.000 stroke with the 4" crank.

Seek another vendor, maybe reds? I personally would go with a machinist that knows flatheads and let them buy the pistons according to my preference and do the machine work.

[flatford39]

Originally Posted by Diavolo

Pistons should be matched to the stroke. The rod is the same and the crank stroke will push the wrist pin higher in the bore. If you are using a 4" (255) crank, you need the matching pistons for the 4" stroke. If you don't, you will have a bad day.

If you look at the selection from Summit Racing, you will see that the only stroke offered is 3.750. Here is the link. http://www.summitracing.com/search/p...rd-flathead-v8 You need pistons for 4.000 stroke with the 4" crank.

Seek another vendor, maybe reds? I personally would go with a machinist that knows flatheads and let them buy the pistons according to my preference and do the machine work.

Thank you...That's what I thought. Look's like I will give Van Pelts a call in the AM.