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Ol' Ron · 07-27-2010, 11:03 AM

I like the 258ci engine because the port valve area can feed this to a higher RPM. WITH POWER. Having run a number of Dyno ests on Flatheads, they all seem to fall off after 45-4800 RPM. Sure they'll turn 55-6000 but the torque is gone. Very long cams with hi lift, and you can push this up abit, But the ports are th limiting factor. That's why Kong Jackson and Dick landy built their 16 port blocks. In Landys case the engines were supercharged and produced over 500 hp.

Back in the real world we have to use what Henry gave us. Porting and reliving work well at hi RPM, but offer little in the way of performance in a street engine.
I have a 3 3/8X3 5/8 crank assy and if I can find it , I'll sell it Cheep. Tell us how it works.

07-27-2010, 11:03 AM	#36
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Boring a flathead I like the 258ci engine because the port valve area can feed this to a higher RPM. WITH POWER. Having run a number of Dyno ests on Flatheads, they all seem to fall off after 45-4800 RPM. Sure they'll turn 55-6000 but the torque is gone. Very long cams with hi lift, and you can push this up abit, But the ports are th limiting factor. That's why Kong Jackson and Dick landy built their 16 port blocks. In Landys case the engines were supercharged and produced over 500 hp. Back in the real world we have to use what Henry gave us. Porting and reliving work well at hi RPM, but offer little in the way of performance in a street engine. I have a 3 3/8X3 5/8 crank assy and if I can find it , I'll sell it Cheep. Tell us how it works.