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drolston · 09-01-2017, 03:28 PM

Check what Flathead Jack has to say in his catalog regarding Power-Flow valves. 1.5 diameter, but the stem and underside of valve are shaved down to open the air passage. Not cheap at $16 per, but the theory is good. I also went with the cut down valve guides, again to clear the air passage. Engine runs great, but without before and after dyno test, it is impossible to quantify the performance benefit.

09-01-2017, 03:28 PM	#7
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,642	Re: 1.6 intakes, 1.5 exhaust. Any merit? Check what Flathead Jack has to say in his catalog regarding Power-Flow valves. 1.5 diameter, but the stem and underside of valve are shaved down to open the air passage. Not cheap at $16 per, but the theory is good. I also went with the cut down valve guides, again to clear the air passage. Engine runs great, but without before and after dyno test, it is impossible to quantify the performance benefit.