Found a nissan 90 for really cheap running. Fast Fred, I was wondering if you anyone you know ever ported one of these big cube motors?? 77cu is alot!
Found a nissan 90 for really cheap running. Fast Fred, I was wondering if you anyone you know ever ported one of these big cube motors?? 77cu is alot!
, does it have the divider in the sided transfer ports? is there a exhaust re-leaf hole in the cyl wall?
Part one of "Secrets of the OMC Mod 50" : http://www.boatracingfacts.com/forums/showthread.php?t=2052
I am assuming that is does. I will try double check tomorow.
No problem - I've exhaust and finger ported one Yam 90, one 70, and one 50. All run very stout once you port and run the compression back up. With high porting, a custom head must be built (best), or weld up the chamber on the existing head and re-shape: Problem is the aluminum doesn't weld very well and you end up with pocks. Looks bad, but the engine doesn't seem to care....
Tim
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