PCV/ Vacuum Help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LongSixEight · 01-29-2010, 10:16 AM

I got my old motor in the truck and running yesterday and now its time to work out the details. Motors a .040 327,11:1 forged pistons, Solid cam .558 lift, Heads are Dart 215's cnc ported and matched to a single plane bowtie intake, with GMPP rockers and pushrods and a 750hp Holley. My questions are with a single big port on the carb for vacuuum how does everyone plumb their PVC and power brakes? This combo has very little vacuum, havent had a gauge on it yet. Dont really want to drill and tap intake. Do I ....

1. Spacer with vacuum port for brakes and Pcv to carb.
2. Pcv to aircleaner base and brakes to carb.
3. Either option with a vacuum reserve canister in line before booster.

Im sure Im not the only one with this problem. Just looking for the easiest soution.

Marv D · 01-29-2010, 03:44 PM

With 11:1 I wouldn't think your on the street all that much (or have a lot of cash around for drum fuel) Have you considered a header evac system? or a vacuum pump? Vacuum helps with cylinder sealing by keeping crankcase pressure down, keeps the motor nice and dry and clean. I run a Aerospace pump on my Nova and simply LOVE it. Doesn't get too crazy and collapse the pan (BIG issue if you running a wet sump pan)

If the 11:1 isn't going to be issue and your on the street, I highly suggest a PCV,, even if you have to convert to a manual master cylinder. I tun manual brakes on my 66 with 72 truck disks on the front (75% of your stopping power) and just Willwood disks on the rear. It will stuff your nose in the windshield if you want.

Or, one of the vacuum canister kits for cars with low vacuum. Then you can port in wherever you want. A buddy even bought one of the electric vacuum pump / canister kits. It worked OK but myself,, I'd go manual before I went to all that headache.

LongSixEight · 01-29-2010, 04:27 PM

The truck is going to be 50/50 street and track, just a toy. I thought about converting to a manual master cylinder too and that is what I will probably do. I have a parts truck with a manual mc so I should have any parts I need to convert it. Any idea of what parts wont interchange with the swap.

**Captainfab** · 01-29-2010, 10:06 PM

If you're running power steering, you could convert your brake booster over to hydroboost. Just another option.....

mixermike · 02-01-2010, 10:17 AM

i just went through this on my 57. i have a big block with a big cam and low vacuum.i have a reserve vacuum cannister between the brakes and the motor with only one vacuum port off the carbs.i just put a plastic tee in the line and ran it to my pcv.some people said it would not work and some said it would.it works great for me,i think the key is having the reserve cannister.if it does not work for you your only out a couple bucks for the tee and hose.easier than drilling another hole

LongSixEight · 02-01-2010, 10:49 AM

I think I will try that first, with the tee and canister. And if that doesnt work Ill switch master cylinder to a manual one. Any pics of your set-up?

01-29-2010, 10:16 AM	#1
LongSixEight Registered User Join Date: Sep 2009 Location: Wamego, KS Posts: 40	PCV/ Vacuum Help I got my old motor in the truck and running yesterday and now its time to work out the details. Motors a .040 327,11:1 forged pistons, Solid cam .558 lift, Heads are Dart 215's cnc ported and matched to a single plane bowtie intake, with GMPP rockers and pushrods and a 750hp Holley. My questions are with a single big port on the carb for vacuuum how does everyone plumb their PVC and power brakes? This combo has very little vacuum, havent had a gauge on it yet. Dont really want to drill and tap intake. Do I .... 1. Spacer with vacuum port for brakes and Pcv to carb. 2. Pcv to aircleaner base and brakes to carb. 3. Either option with a vacuum reserve canister in line before booster. Im sure Im not the only one with this problem. Just looking for the easiest soution.

01-29-2010, 03:44 PM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: PCV/ Vacuum Help With 11:1 I wouldn't think your on the street all that much (or have a lot of cash around for drum fuel) Have you considered a header evac system? or a vacuum pump? Vacuum helps with cylinder sealing by keeping crankcase pressure down, keeps the motor nice and dry and clean. I run a Aerospace pump on my Nova and simply LOVE it. Doesn't get too crazy and collapse the pan (BIG issue if you running a wet sump pan) If the 11:1 isn't going to be issue and your on the street, I highly suggest a PCV,, even if you have to convert to a manual master cylinder. I tun manual brakes on my 66 with 72 truck disks on the front (75% of your stopping power) and just Willwood disks on the rear. It will stuff your nose in the windshield if you want. Or, one of the vacuum canister kits for cars with low vacuum. Then you can port in wherever you want. A buddy even bought one of the electric vacuum pump / canister kits. It worked OK but myself,, I'd go manual before I went to all that headache. __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

01-29-2010, 04:27 PM	#3
LongSixEight Registered User Join Date: Sep 2009 Location: Wamego, KS Posts: 40	Re: PCV/ Vacuum Help The truck is going to be 50/50 street and track, just a toy. I thought about converting to a manual master cylinder too and that is what I will probably do. I have a parts truck with a manual mc so I should have any parts I need to convert it. Any idea of what parts wont interchange with the swap.

01-29-2010, 10:06 PM	#4
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: PCV/ Vacuum Help If you're running power steering, you could convert your brake booster over to hydroboost. Just another option..... __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

02-01-2010, 10:17 AM	#5
mixermike Registered User Join Date: Jan 2008 Location: Post Falls, Idaho Posts: 606	Re: PCV/ Vacuum Help i just went through this on my 57. i have a big block with a big cam and low vacuum.i have a reserve vacuum cannister between the brakes and the motor with only one vacuum port off the carbs.i just put a plastic tee in the line and ran it to my pcv.some people said it would not work and some said it would.it works great for me,i think the key is having the reserve cannister.if it does not work for you your only out a couple bucks for the tee and hose.easier than drilling another hole

02-01-2010, 10:49 AM	#6
LongSixEight Registered User Join Date: Sep 2009 Location: Wamego, KS Posts: 40	Re: PCV/ Vacuum Help I think I will try that first, with the tee and canister. And if that doesnt work Ill switch master cylinder to a manual one. Any pics of your set-up?



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