Manifold vacuum port question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

e rock · 05-20-2007, 11:57 PM

Vehicle: 71 K20 350/465

The motor I just pulled out had just one (5/16"?) port on the rear of the intake that fed the power brake booster. The new motor going in has a vacuum port (is that even the right word? I've been searching for pics, but apparently I'm using the wrong word.) that has 2 smaller tubes out the side (1/8"?). From recent threads, I think I'm convinced to using the manifold vacuum for the dizzy's VA, but will the other one be ok to use for the brakes?

It sounds like I'm going to have to buy a vacuum reserve canister anyway due to the cam I'm running, so maybe the small port size isn't as big a deal?

Thanks,
Eric

05-20-2007, 11:57 PM	#1
e rock Registered User Join Date: Nov 2006 Location: Monroe, WA Posts: 87	Manifold vacuum port question Vehicle: 71 K20 350/465 The motor I just pulled out had just one (5/16"?) port on the rear of the intake that fed the power brake booster. The new motor going in has a vacuum port (is that even the right word? I've been searching for pics, but apparently I'm using the wrong word.) that has 2 smaller tubes out the side (1/8"?). From recent threads, I think I'm convinced to using the manifold vacuum for the dizzy's VA, but will the other one be ok to use for the brakes? It sounds like I'm going to have to buy a vacuum reserve canister anyway due to the cam I'm running, so maybe the small port size isn't as big a deal? Thanks, Eric



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