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Need some tips on tuning a '72 510 SSS engine with Dual Hitachi SUs


Will

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I lined the crank pulley up with the TDC mark and checked the cam gear - the dash on the plate lined up perfectly with the cam dowel, and the gear is set at dowel hole #2. (My cam gear isn't as pretty as the one in the picture - I had to block the chain, unbolt the gear and pull it a bit forward to see the dash! ...next time it would be nice to get one of the Japanese timing kits...)

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I'm wondering - I hear a clattering kind of sound - more through the carbs, but since there aren't too many moving parts in the carb, could I be hearing a crapped-out valve seat? The sound started since I got to Syracuse a few days ago.

 

Also, I had new hardened steel valve seats put into the head since the old bronze ones were beginning to sink. maybe one of them popped out?

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