I have a 572 BBC pump gas motor I am building for my street car. It has a Mark IV Bowtie 10.2 block and I have a Merlin single plane intake with recessed distributor hole for using a stock style distributor with the tall deck block. I have a standard length MSD HEI distributor that does not have a slip collar. I dropped the distributor in and everything looks ok as far as I can tell but with the recessed hole its impossible to see for sure that the distributor collar is sitting on the intake or if its bottomed out somewhere else before the collar makes it to the intake. Is there a way to tell for sure? Where would the distributor bottom out first if the intake vs. collar were not right? i have a Melling M77 pump and a ARP oil pump shaft and a Lunati hyd roller cam. Thanks
Steve86GN
I'm not sure that that posted link is exactly what the op was asking. You don't want the dist. bottomed out anywhere. About .030 to .050 away from bottomed out on the pump shaft is ideal. If the engine is still on the stand, you can pull the main oil galley plug at the rear, shine a light in, and confirm that oil band on the dist is centered in the oil galley. If it is, and you can pull the rotor and shaft up a little while the housing is firmly on the intake, you should be ok. If it were bottomed on the shaft, there would be no upwards movement at the rotor.
This explains it very well good luck http://www.msdignition.com/uploadedFiles/MSDIgnitioncom/Products/distributors/85561_instructions.pdf
On my 509 I machined off factory pad on my HEI dist and used Moroso adustable slip coller Link here for product http://www.summitracing.com/search/?keyword=Moroso%20slip%20colar&dds=1 My dist would not engage oil pump. Good luck
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