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Jetting for a 390 cfm double pumper?
https://www.slantsix.org/forum/viewtopic.php?t=39640
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Author:  ChYmAiL [ Mon Mar 29, 2010 7:28 pm ]
Post subject:  Jetting for a 390 cfm double pumper?

Hi there US Slanters!

I build my new slant for my GTX... and used a 390 cfm double pumper... Do you have any info on a near there main jet info for this? I´m using a 270/280 cam with 108 lobe center line, bigger valves, etc.

I´m using now #58 in primaries and #60 in secondaries... secondaries seem short... (no power valve there)

Here is a small video I took...

http://www.youtube.com/watch?v=6gqfxrzprQw

Cheers!!!!!!!

Author:  AndyZ [ Tue Mar 30, 2010 5:05 pm ]
Post subject: 

I have close to the same jetting on mine. Comp Cam 264. I used a lighter seconary spring to get then to open a little sooner which helped with the transition. Hope this helps.

Author:  ChYmAiL [ Tue Mar 30, 2010 8:20 pm ]
Post subject: 

Thanks Andy! Mine´s a Double pumper... not vaccum secondaries... but seems i´m near...

Author:  AndyZ [ Wed Mar 31, 2010 12:12 pm ]
Post subject: 

Cool! Keep me posted on your progress. Good luck!

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