shit thomo now your scraping the bottom of my barrel but if mem is ok theres a difference in the dia of the cog on the bottom some are a different diameter also the bush in the block are different too , but to me the look of the gear seems to have got some metal between that and the cam drive a mate had similar in a stock car and we worked out he had a new dissy on a old block with the large dia bush , its a bit hard to measure with out pulling it down , there is one way to prove it thats to make a lead slug and put it down the hole and give it a smack with a hammer and pull it out and measure it but dont drop it or you gotta pull it down cheers Don
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