392 Hemi - Blown - Which System

BoredStroked · 02-24-2007

Hi: I'm building a 6-71 blown 392 Hemi, big Donovan heads, big cam, etc.. Should make somewhere aroung 750 HP at 8 lbs boost. Anyway, was wondering what configuration to use:

1) First running the engine with dual BG 650 carbs

2) Future: May switch over to a FAST XFI with 60 - 80 lb injectors - probably in a retro Hilborn 4-port injector.

This is a street rod -- with a 7535 MSD controller. I'll already have a MAP sensor to drive timing retard, etc..

What would you guys recommend? Should alcolhol be injected above the rotors or below. What size nozzles? Any info will help.

Thanks a bunch! Dale

Rocket468 · 02-26-2007

I don't see many 392 hemi around. They are a pretty hard motor to come by. Injecting before will not harm your 6-71 they are intended to have fuel pass thru them.

I would recommend going with our progressive kit and running a m10 nozzle on each carb spacer "dual nozzle" . The progressive kits really allow for it to adjust with your boost vers just being off or on as the base setup.

02-24-2007	#1 (permalink)
BoredStroked Water Injection Newb Year: 1957 Make: 392 Hemi Model: Chrysler Join Date: Feb 2007 Posts: 1	392 Hemi - Blown - Which System Hi: I'm building a 6-71 blown 392 Hemi, big Donovan heads, big cam, etc.. Should make somewhere aroung 750 HP at 8 lbs boost. Anyway, was wondering what configuration to use: 1) First running the engine with dual BG 650 carbs 2) Future: May switch over to a FAST XFI with 60 - 80 lb injectors - probably in a retro Hilborn 4-port injector. This is a street rod -- with a 7535 MSD controller. I'll already have a MAP sensor to drive timing retard, etc.. What would you guys recommend? Should alcolhol be injected above the rotors or below. What size nozzles? Any info will help. Thanks a bunch! Dale

02-26-2007	#2 (permalink)
Rocket468 DevilsOwn Staff Year: 2000 Make: Pontiac Model: Grand Prix Join Date: Apr 2005 Posts: 1,107	Re: 392 Hemi - Blown - Which System I don't see many 392 hemi around. They are a pretty hard motor to come by. Injecting before will not harm your 6-71 they are intended to have fuel pass thru them. I would recommend going with our progressive kit and running a m10 nozzle on each carb spacer "dual nozzle" . The progressive kits really allow for it to adjust with your boost vers just being off or on as the base setup.