The Ford Barn

theHIGHLANDER · 10-03-2022, 04:41 AM

I've always found that the basics will never fail you. Urban legends, old wives tales, "expert" inputs are often the good intentions that pave the road to hell. Basic rule 1 should be make a plan and stick to it. Don't seek addl input unless there's 1 specific task to address. Stay on point, follow your plan. Porting, what "looks fast" often is not. Look up what a boundary layer is in airflow and aerodynamics. To that end make your header or manifold bigger than the port opening. On the intake side the port in the block should be a wee bit bigger than the intake. It makes the reverse flow moment cleaner. If you're scratching your head rt now, consider the overlap in any cam. It creates a reverse pumping action when both valves are open, it does indeed go both ways. Any obstruction will create some blockage needed to keep the charge clean. While it's a more high RPM mod it will work at cruising speeds and net clean carbs and plugs when implemented. You can look this up and find that it isn't one of those urban legend, and in fact the one most common on that topic is to keep manifolds small and build back pressure and increase compression. How freakin silly is that? Go ahead and delve into it. Fascinating, and free too.

10-03-2022, 04:41 AM	#21
theHIGHLANDER Senior Member Join Date: Sep 2010 Posts: 492	Re: The perfect "street engine" I've always found that the basics will never fail you. Urban legends, old wives tales, "expert" inputs are often the good intentions that pave the road to hell. Basic rule 1 should be make a plan and stick to it. Don't seek addl input unless there's 1 specific task to address. Stay on point, follow your plan. Porting, what "looks fast" often is not. Look up what a boundary layer is in airflow and aerodynamics. To that end make your header or manifold bigger than the port opening. On the intake side the port in the block should be a wee bit bigger than the intake. It makes the reverse flow moment cleaner. If you're scratching your head rt now, consider the overlap in any cam. It creates a reverse pumping action when both valves are open, it does indeed go both ways. Any obstruction will create some blockage needed to keep the charge clean. While it's a more high RPM mod it will work at cruising speeds and net clean carbs and plugs when implemented. You can look this up and find that it isn't one of those urban legend, and in fact the one most common on that topic is to keep manifolds small and build back pressure and increase compression. How freakin silly is that? Go ahead and delve into it. Fascinating, and free too.