340 build

1930 said

Ok thanks, is there really so much that has to be changed to do this procedure for a piston that is below deck, like I had mentioned the 340 is already at the machine shop, its tough to find a good machine shop in this area, they know they are good and they are gonna tell me to go pound sand if I ask for my shiz back to make some measurements.

Id like to not make another mistake on another engine so Id like to learn the procedure on the 440 which is the only other engine I have avail to me now.

Seems like its prob. something simple that could be changed within your procedure to make it work for a piston that is below deck but you tell me, maybe it just isn't that easy

Click to expand...

It is easy;real easy. Just put a spacer of known thickness on top of the piston, in the very center, that is thicker than the negative deck height. Then after measuring the new positive deck height, subtract the spacer height and Presto! there it is; the negative deck height to at least two maybe three decimal places.
For example;
If your pistons look to be .150" down in the hole. You put a spacer on there that is exactly .250 thick. You measure the deck height in the normal way with the keystock spanning the center of the hole on the wrist-pin axis. You measure it to be .098 up. Then you subtract the spacer thickness from that and get MINUS .152. Your piston is down in the hole .152 inch. Minus means down in the hole.

If you had used a .200" spacer, the deck ht would have measured .048, and subtracting .200 from that would get you MINUS .152, same number.

Down in the hole is not automatically a bad thing.