Hi guys.

Im not sure if this is where I should have put this, but feel free to move it mods if need be.

Ok I am in the process of swapping in a Carbed 400 SBC, and the car was originally a 2.8 V6. My cam lift is .525/.525 but with my 1.6 RR its about .540/.540. I am running an Edelbrock Performer RPM Manifold & a 750 cfm Speed Demon Carb w/ Mechanical Seccondaries, and my question is what can I do about vacuum for my power brakes and such?


Thanks for any and all help, Im trying to get my car back on the road by graduation. We'll see if that can happen tho, Ive got 2 more weeks..

 

Most likely you won't have any problems with it. Remind me what your cam duration is (that's what matters, not lift).

 

Intake Duration at 050 inch Lift:248
Exhaust Duration at 050 inch Lift:248
Duration at 050 inch Lift:248 int./248 exh.
Advertised Intake Duration:294
Advertised Exhaust Duration:294
Advertised Duration:294 int./294 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.525 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.525 in.
Valve Lift with Factory Rocker Arm Ratio:0.525 int./0.525 exh. lift
Lobe Separation (degrees):110
Intake Valve Lash:0.022 in.
Exhaust Valve Lash:0.022 in.
Grind Number:CS 294S-10



Right off of Summits website, because I couldnt remember the duration. As for the fitting to use off the Intake what should I use? Im thinking Im going to need a decent size carb spacer for my Speed Demon to fit a fitting in there..

 

Hmmm, that is a lot of cam.

I don't believe the Speed Demon has both a PCV port and vacuum booster port. You could use the vacuum tap on the runner behind the carb.

 

I also have a Performer RPM manifold, and I used a 3/8" NPT to 3/8" hose barb 90 deg brass fitting in the runner right behind the carb. Clearance is tight but it fits, and gives you separate 3/8 barbs for PCV and brake booster.