Currrently run a 396, 11.1:1Cr, 232/242 110LSA lift .544/.560. Could I still run this cam w/ out problems if I decide to go blower and drop the compression? I shooting for 10-12lbs, how low do I need to drop the compression? The crank and rods are lunati forged and the pistons will be Ross if I decide to do this. Any other things I need to take into consideration? Do I need to go w/ different rings as to what I currently run now (Total seal)? What size inj will I need? I have 36's in now w/ 255 Racetronix fuel pump...is a inline necessary as I have one laying around new that I haven't installed.

Thanks for any and all assistance.

 

John, i think it's best to go with New pistons with lowered compression pockets (dish), that should bring it down pretty good but i'd use a calculator instead to calculate exactly what you have now and what you would need in order to reach your optimal CR (amount of CC for the pockets).
While your at it you can (actually SHOULD) also calculate your Dynamic CR using your cam specs and this will even more tell you what you would need to get.
I'd personally ditch the cam and get a specific custom blower grind for your setup, the $250 are NOT going to break the bank when your doing a SC setup including some internal work.

New rings will be best with the new pistons.

I'd shoot for 9.5:1 SCR with your setup and your boost aims. Your Walbro 255 should be FINE.

The injectors will be somewhere in the 5X lbs range but there are caclulators to figure it out too. Racetronix will advise you what you need and do the math for you !

 

Serg from what I've gathered I can go 42#'s and ditch the FMU. I can run the same cam but on a 115 LSA and as far as the CR I'm thinking 8.5:1 or 9.1. With a P1 it won't be enough so a D1 would have to be in order.

Thanks for the info. Anyone else have any comments?