Thread: Need our engine experts to help me out.

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were is the piston to wall at ?

If you mean are the pins moved up into the piston for the longer stroke, yes, the pin is pretty high and the pistons are very short, compared to the stock sbf pistons I'm used to.

John, sorry, I just noticed your post in there. I think the pistons are in right because they had a notch that goes to the front on each one and I installed it that way.

Pat, I didn't check piston to wall.....I know I should have but I'm not that sophisticated in these things. I just trusted that the block is 30 over and that is what kit I got.

The more I think about it the more I think my backfire bent something. It really backfired and even blew the rubber plugs off of the vacuum ports on both carbs. I got it somehow 180 out of phase for the restart after the galley plug incident, and when we cranked it the thing backfired out the carbs and flames out the headers. I bet I bent something.

I'm going to tear it down and I bet I find some damage caused by my dumbness. The noise in the engine was not there the first time we ran the motor for 5 minutes, it was only there after the galley plug/backfire thing. I could slightly hear the knock even with open headers after I put the motor back together, so I think whatever happened happened the second time around.

Don