70 Swinger 340

Vitamin c said

I'm taking a gamble on repairing the original block. One of the guys at the machine shop looked at it and said no way, and the other said no problem. It appears that the motor was rebuilt at some point in its life and had the pistons installed backwards with the valve reliefs in the wrong position. I've heard this was common practice for more power, not sure if that's true. install a big cam and KAPOW! Every piston had valve marks on the wrong side. The machine shop said for a mild build it should hold, we will see.

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Yes the pistons were installed upside down, seen that when I did the head gaskets. I think epoxy on the bottom of the cylinders will seal it with the new sleeve installed.

The damage occurred when I missed a 1-2 shift, no revvv limiter at that time. Valves Floated and 1 of them dropped....... All part of the game.

I always use a revv limiter now....... Unless it is on Nitrous, I either take it out or put the chip at 7400+ , of course this is not on a recipe for a stock engine! Lol on that set up the Limiter is only there if the driveline breaks. NOS and bouncing off the limiter is NOT good! haaaa