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Ol' Ron · 06-02-2017, 08:18 PM

I don't think you can improve the ports for a street engine. Plus there is more to porting than just making it bigger. One of the best running street engines was in Richarrds from fls 276 53 HT. with atock ports I drove the car and was surprised at the performance. All this porting and other mods to combustion chambers happen over 4000 rpm. I do believe the port matching is a good idea, but have no knowledge to prove it one way or another in our flatheads What does help in the CR of the combustion chamber and the piston to head clearance. I believe that is more important in a street engine than porting..

06-02-2017, 08:18 PM	#296
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,861	Re: New block I don't think you can improve the ports for a street engine. Plus there is more to porting than just making it bigger. One of the best running street engines was in Richarrds from fls 276 53 HT. with atock ports I drove the car and was surprised at the performance. All this porting and other mods to combustion chambers happen over 4000 rpm. I do believe the port matching is a good idea, but have no knowledge to prove it one way or another in our flatheads What does help in the CR of the combustion chamber and the piston to head clearance. I believe that is more important in a street engine than porting..