So im to the point where im cutting valves for the head im working on. I cut the valves on my 289 and it was recommended that i cut them at the specific angles (45 intakes/44 exhaust) and include a 30 degree angle higher up on the seating surface. Will i find any benefit with this on the intake valves on the b18c1 head? I gauged it and the exhaust valves just didnt have enough space to do it anyways, but at least on the intakes it would work. Any advice?

 

30,45,60 on head and 45,35 back cut on valve is the stock valve angles for a GSR IIRC

 

I could have sworn there was a thread on backcutting valves the other day. My machinist plays with angles from 28-32.


Edit: Here it is
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/back-cutting-stock-valves-2508292/

 

thanks, i guess i didnt catch that one. i guess my machine can only cut 45/44 and 30/29

 

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