I 'm running a 622ci bowtie splayed block, 4.625 bore, 4.625 stroke, callies crank, oliver rods lunati cam, gm high perf. alum. heads JE 10.5:1 pistons, jessel valve train and timing belt and MSD ignition, engine dynoed at 837hp@5800 rpm and 858ftlb@4700 rpm, boat is running mid 90's, I would like to get it over the 100 mark, I'm just about out of options for a natrally asperated motor, so what size of blower should I look for and what should I drop the compression to. I would think it wouldn't take much to push it to 1000hp, but I'm sure this is a position a lot of you have been in. ANY THOUGHT'S
Thanks in advance
larry

come on< I know someone has a recomendation, give it up.

well I would lower compression to 8.5:1 and drop a 12 or 1471 on....nice motor, I had a 10.5:1 632" NA motor a few yrs back. you can get 1000hp with low, low boost 4-6#.

You are not out of options....Another way you could probably get to 1000hp is to go with a set of Dart 18 degree 370 Oval ports, and cam change...problem is you have to get a sheet metal intake made for the 18 degree stuff....but those are awesome heads.

max 8.5 compression and whipple, procharger or vortec with an intercooler. With one of these you will get the most HP for lb of boost.

a 14/71 is what i had in mind, the pistons I have are new (less than 5 hrs) JE said they could cut them down to what I wanted, I don't want to run an intercooler if I can help it, I figure with lots of air and low boost (4-6) it should be ok, I've looked at the whipples, but not sure if 1 whould do it, and a quad with efi is big, big bucks, and I don't care for the blow through sys. fuel ingection is an option, but I'm an old carb guy.
thanks for the info guy's
I will take all I can get.
larry

Big blower, turning slow, at low boost will not need a chiller especially with Aluminum heads...

Why no chiller?

What Octane you going to use?
Big blower turning slow wont idle well and your plugs will load up quickly.

I was thinking a 14/71 also. 622CU/IN is a hell of a lot of motor to feed. I'd give the guys at PSI a call. I'm sure they will get you on the right road.


Darrell.

I agree with the 14/71,2 big doms also.I would think you could run it with out a innercooler, but I would dyno it to get a tune up on it,cheap insurance.

I would not cut the pistons , most of the higher compression pistons will have a thinner dome/piston top ...Most? But if they say there enough there ...the ring land needs to be .300+ down.espicaly if your not going with a innercooler.

I would call Marv at www.boostdaddy.com and look into a Blowershop blower,You can pick his brain also,

your prob going to need a blower cam also

I hope ya have a speedmaster