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four of my pistons on my six are slightly facing slightly to between 11:00 o clock and 12:00has anybody here ever seen anything like this before. this engine was rebuilt before I purchased last year and was sitting for quite some time. the pistons are all marked std and no ridge in the walls. Dave

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If you're just referring to where the size or piston number is stamped on the piston as compared to the centerline of the block, those markings are not a reference indexing mark. On some pistons you'll also see an arrow to indicate which way the piston installs (which side the expansion slot faces) but these likewise are not precise markings.

Owen, thank you for the reply, this was puzzling me. I have a friend that works and owners old cars , dodge brothers and Nash. He said also that if the rist pins were bad it would be rapping. I have a rough running engine at off idle speeds, my next check will be the hominic balancer. New motor mounts, clutch Assembly, went through distribator twice, adjusted valves, oil pressure 35, compression all good, timing good, I don't know what ealse it could be. Thank you Dave

Try a new KNOWN TO BE GOOD condenser. Make sure that no plug wires of CONSECUTIVEE firing cyclinders are touching each other at any point (unless they run thru a metal tube).

Check the wire INSIDE of distributor that runs from points to side wall of distributor for any broken insulation or broken wire inside of insulation..

The "ruff runningg just off iddle" sounds like a bad condensorr or even bad coil.

What is the NUMBER on the spark plugs??? Too cold of a sparrk plug will cause ruff running on throttle tip-in.

Simpler stuff than tearing the head off, but your troubleshooting doesn't mention the fuel system. Did you ensure the carb was in good condition? What about the fuel tank and fuel lines? Sometimes people rebuild an engine but don't put the same amount of care into the fuel delivery system.

I learned this lesson the hard way. I had a Willys Wagon that someone had swapped a Chevy 265 V8 into. Put a new carb on it, and it would idle perfectly but wouldn't make any power or run smoothly off-idle. The fuel line was clogged - I fixed that and it ran great!

Good luck, and please let us know what the culprit is.

Ok the distributor bushing are tight new points and condenser and new inner hot wire. New coil and wires also. Plugs are all burning clean, Reconditioned gas tank, new sending unit, new fuel lines with glass bowl filter, fuel pump and clean rebuilt carberator. No vacuum leaks and vacuum advance is good. Has plenty of power and runs and starts good ! I also wanted to replace the head gasket to make sure all was well. Putting in new studs to make sure all is good thair, I know I don't have to but that's me. Nice guality studs fram kanter. I will get there. Thanks guys, Dave