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Jack Shaft · 03-13-2020, 10:31 PM

Building performance in any engine requires a balance.more compression? add more fuel,more exhaust better spark control...and a better cam.Look at it this way..a model a engine,stock flows at about 180 CFM..180 cubic feet of air flow. A stock Zenith,even a B zenith flows at about 80 CFM,your basically leaving half the fuel/air mixture out of the equation.Stromberg 97 flow rate matches the model A flow..compression increases are great but reduce your tolerance for timing deviation..in short,run a mechanical advance distributor,stop the hand work. Lastly,now that air flow ,compression and precise timing is nailed,open your exhaust some..

03-13-2020, 10:31 PM	#37
Jack Shaft BANNED Join Date: Dec 2019 Posts: 1,196	Re: High compression head choice. Building performance in any engine requires a balance.more compression? add more fuel,more exhaust better spark control...and a better cam.Look at it this way..a model a engine,stock flows at about 180 CFM..180 cubic feet of air flow. A stock Zenith,even a B zenith flows at about 80 CFM,your basically leaving half the fuel/air mixture out of the equation.Stromberg 97 flow rate matches the model A flow..compression increases are great but reduce your tolerance for timing deviation..in short,run a mechanical advance distributor,stop the hand work. Lastly,now that air flow ,compression and precise timing is nailed,open your exhaust some..