Hap Jones pistons 3mm 250

[sixtiescycle]

And another piston problem question. Anyone ever had a problem with these hitting the head?

[LOUD MOUSE]

What part of the piston hits the head?. .....lm

And another piston problem question. Anyone ever had a problem with these hitting the head?

[sixtiescycle]

The outside edge. At TDC should the outer edge of the piston be flush with the top of the sleeve, these are above it.

[LOUD MOUSE]

How much.
More than the fire ring will cover?. ......lm

The outside edge. At TDC should the outer edge of the piston be flush with the top of the sleeve, these are above it.

[sixtiescycle]

I didn't measure but it must have been higher than the ring as it was together and torqued when I rolled it through.

It's about back together with a .010" thicker base gasket and a slight bevel on the edge of the head. We'll see what happens now.

[LOUD MOUSE]

You did use a 3mm over head gasket. ........lm'

I didn't measure but it must have been higher than the ring as it was together and torqued when I rooled it through.

It's about back together with a .010" thicker base gasket and a slight bevel on the edge of the head. We'll see what happens now.

[sixtiescycle]

Definitely, 3mm Rocky gasket. Problem is now solved as it rolls through freely at TDC. The thought occurred to me that the cylinder may have at one time been decked so I measured the height of it and three other cylinders, all were the same. I have another piston kit and hope I will not have this problem when the time comes to use it. I will make note of this so I won't forget to check it!