Here are the engine spec's for Kaase's 509.
Bore 4.310
Stroke 4.350
combustion chamber 37 cc's
Intake valve 2.23
Exhaust valve 1.72
Intake port volume approx. 310 cc's
Intake port flow at .500 366 cfm@28" .600 394cfm .700 410cfm peaked at
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Exhaust port flow at .500 244cfm@28" .600 266cfm .700 275cfm peaked at
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Jon told me that he did very little porting to the intakes and almost no porting to the exhaust. Where he did most of his work to the heads was in the combustion chambers; he did not comment on valve position. I do know for sure that he did not cant the valves for two reasons. One, I personally seen the valve covers off, and two, the rules do not allow it. Jon would not take a chance of being disqualified for that.
Jon's intake looked a great deal like the inside of our ported Victor that we are currently using on a customers 510 cu.in. combo with the Tiger heads.
To my surprise when I flowed the head with the ported Victor, the head actually liked it a great deal in the mid lift ranges. The upper lift range had minimal or no effect. Looks like all the talk about the Victor not being able to keep up with the Tigers is fallacy.
I would like to take a moment to thank Bob and Frank for bringing this great product to market. I spent alot of time and money designing and developing this head. These things do not just happen over night or, like some would like to think, even in a year or two. This should be an example for everyone out there that if we work together, we can achieve anything.
Don Johnston
DCI MOTORSPORTS LLC