Thread: BBC 336781 Heads?

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well the small cam will work better with the low CR . and the small ports may slow you down BUT .... you need more cr to go with more any thing as i see it .so i not shure how nuts your going with port work there no need for it. good 4 angle on intake valve seat. full radius one angle on ex seat with some short side radius on the port that about it .you could use bigger valves 2.190/1880 .but porting work may hurt low speed tq less he has numbers to back up the work . i like the ideal of a smaller port with a bigger valve to pick up port speed on a lower rpm engine . the cam that marine bbc used with small port heads low pro intake .and iron log ex was the 500/500 222/234 @050 on 115 and this engine made 330 hp so it a great cam for low cr and small heads .so with headers and intake should not be hard to get it to 375+ hp or could try Erson e120020 232/239 549/558 110 adv 6 so on 106 or i may think about this cam kit elign e1117pk 549/558 232/239 110lc 440 hp marine cam looks alot like erson # 120020