BAD-HABIT

Switching over to the SBC Vortec RPM Air-Gap after using the standard vortec performer for my 358 SBC. Any thoughts? Seems like a solid 10-20 hp gain from 3500-5500 compared to the performer and yet still very close under 3500...Everything written seems very positive....

BH

bobby daniels

Yep BH they are very close in power until you really turn ths motor then the air gap will do better ,it should like a one inch open hole spacer also

BAD-HABIT

Bobby....I was reading a buildup of a GM crate 383 in Hot Rod magazine with the same heads and compression ratio I have the cam was considerbly smaller though. They mentioned that while the spacer is usually good for some extra hp on most intakes on SBC's on the RPM-Air-Gap that they actually lost 25ft lbs of torque and about 10hp......They noted that that was unusuall. My motor is running a Comp Cams XM 270 Roller 218/224 with .493/.505 lift. With the Performer intake I was pushing about 360hp. Power max's out at about 5400......I have a 1" 4 hole spacer so I will try with and without....
Thanks

BH

bobby daniels

yep I read that same acticle but I thought you would have a bigger came in the boat and it should help ,but just advise

FlyFast

Dear Bad

I have an air gap on my sbc. I really like it. I went from a stock intake to the air gap and my motor came alive. I run full closed cooling and my vortec sbc has been trouble free for the year + that I have had it. My closed cooling has a couple inch perko strainer scoop on the bottom of the hull that gives me lots of cooling water and keeps my block pressure around 5 psi. I think as long as you don't over pressure the intake gaskets and make a milkshake it is the way to go. I have heard that they have some better intake gaskets now than they did when I did my engine. Get the best intake gaskets that you can find.