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Discussion Starter #1
We made 4 pass's last night and after every pass the distributor cap was lifted up, it bent the spring clips that hold it on the distributor. We straightened them up and put some zip ties across the top of the cap to help but it would still bend one side or the other. Its a 468 BBC running a toilet. New motor, old combination that was used before, just a new block.
Idea's ?
 

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Pontiac aficionado
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Why would you even use the spring clip style?

Why didn't you just take the extra time and cut them off and use the screws supplied by MSD. Might want to also drill a small 1/8" hole in the side of the cap too. ;)
 

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Discussion Starter #7
Why would you even use the spring clip style?

Why didn't you just take the extra time and cut them off and use the screws supplied by MSD. Might want to also drill a small 1/8" hole in the side of the cap too. ;)
I don't remember seeing any screws supplied when we bought the distributor. Definitely have to check that out.

As far as fitting to the block, no we did not. But it's on the list of items to check now.
 

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how old are the check valves on your evac? could be building press instead of pulling?
 

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How much does the shaft move up and down in the housing?

If it isn't crankcase pressure blowing the cap up it's the shaft rising and pushing the cap up. If vertical shaft movement is the culprit, the rotor and the cap should show signs of contact.
 

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Try looking into the oil pump and drive rod. It likely is pushing the whole mess up, i am thinking if the cap lifted by itself without the rotor coming with it there would've been some nasty ignition stuff going on, and the rotor is at the other end of the oil pump/distr drive shaft assemblies. If the distr drive was lifting by itself (like running up on the distr gear) engine timing would have gone thru a big change and oil pump drive might have come out of the groove. So it sounds like the whole mess is moving upward. Let us know what you find, interesting problem and we can all learn something. Good luck, oj
 
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