Opel Forums - View Single Post - Side By Side Cylinder Head Comparisons/ RallyBob's Performance Suggestions

RallyBob · 03-17-2002

I've never had a problem with turning them down. And yes, I've experimented with different valve sizes over the years. 1.72, 1.78, 1.80, 1.84, 1.85, 1.88, 1.92, 1.94 and even 1.97 for the intake side. Exhaust side I've done 1.45, 1.50, 1.55, 1.60, 1.625. Depends on cyl. head type, application, engine displacement, bore diameter, etc.

Bob

03-17-2002	#33 (permalink)
RallyBob Project 1450 supporter... Join Date: Mar 2002 Location: Pleasant Valley, CT Posts: 6,552 Classified Rating: 0% (0)	I've never had a problem with turning them down. And yes, I've experimented with different valve sizes over the years. 1.72, 1.78, 1.80, 1.84, 1.85, 1.88, 1.92, 1.94 and even 1.97 for the intake side. Exhaust side I've done 1.45, 1.50, 1.55, 1.60, 1.625. Depends on cyl. head type, application, engine displacement, bore diameter, etc. Bob Last edited by kwilford; 06-12-2005 at 12:30 AM..