SCJ lift/cfm specs.

Hi everyone.
What would be a optimum cfm rate/per lift rate on a Kaase SCJ head, say at 700 lift? Dont want to turn it over 7,200 rpm. Head needs a cleanup and 3 angle valve job. Just want to keep it a minimum massage bolt together deal using the stock valve springs for now. Bore is .080, flattop, 13:1 com, 4.14 stroke.
Thanks.
Al

Most of the SCJ stuff I've messed with peaked well before .700" lift.

The P-51 has as good of CFM per rate of lift you will find on a conventional head.

Not sure what your after, but that head with a good multi angle vale job and bowl clean up will be very good just like it is and hard to improve upon.

Give us more info on what your wanting to do.

Thanks for the replies fellas.
Its for my Maverick. Reason I wanted to stay at 700 lift, was on account of the valve springs. Was just wanting to keep it simple for now. Probably should have bought P-51's.
Keith Fulp went 9.90 on 700 lift @t 4,000lbs. So I figured high 8's should be possible for my cars weight (2,300-2500 lbs.
Looking for some numbers on cfm/ lift that would be optimum using stock valve springs without going hog- wild on then.
Trying to balance things out with velocity/lift cfm's
Thanks. Al

72mav wrote:Thanks for the replies fellas.
Its for my Maverick. Reason I wanted to stay at 700 lift, was on account of the valve springs. Was just wanting to keep it simple for now. Probably should have bought P-51's.
Keith Fulp went 9.90 on 700 lift @t 4,000lbs. So I figured high 8's should be possible for my cars weight (2,300-2500 lbs.
Looking for some numbers on cfm/ lift that would be optimum using stock valve springs without going hog- wild on then.
Trying to balance things out with velocity/lift cfm's
Thanks. Al

By 'stock' do you mean the 1243 PAC springs? That come with the SCJB heads these days?

Which springs do you have? The roller or flat tappet?

72mav wrote:Hi everyone.
What would be a optimum cfm rate/per lift rate on a Kaase SCJ head, say at 700 lift? Dont want to turn it over 7,200 rpm. Head needs a cleanup and 3 angle valve job. Just want to keep it a minimum massage bolt together deal using the stock valve springs for now. Bore is .080, flattop, 13:1 com, 4.14 stroke.
Thanks.
Al

Piston speed is the "demand" that needs to be satisfied. Based on demand then you can calculate what you need for CFM.

Stock roller springs.

Straubtech wrote:

72mav wrote:Hi everyone.
What would be a optimum cfm rate/per lift rate on a Kaase SCJ head, say at 700 lift? Dont want to turn it over 7,200 rpm. Head needs a cleanup and 3 angle valve job. Just want to keep it a minimum massage bolt together deal using the stock valve springs for now. Bore is .080, flattop, 13:1 com, 4.14 stroke.
Thanks.
Al

Piston speed is the "demand" that needs to be satisfied.  Based on demand then you can calculate what you need for CFM.

So how do we figure piston speed?

http://www.csgnetwork.com/pistonspeedcalc.html

That should work for you.