PCV on a 86 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sapmap · 10-10-2003, 10:04 AM

I recently got a 1986 GMC 1/2 ton with a 350. All smog has been removed, along with the PCV.
Is the PCV required.
The port on the carb is plugged, and the valve cover has a breather stuck in the hole where the PCV used to be.

**old Rusty C10** · 10-10-2003, 10:26 AM

dont know where ya live but ya may not get past inspection without all that stuff. I know here in my area ya wont

784X4GUY · 10-10-2003, 10:41 AM

i know here in Pheonix you wont get through emissions if you dont have your pcv valve hooked up to the carb. Just buy a new one with some hose and rehook it up

**Captkaos** · 10-10-2003, 10:53 AM

Also if you don't run one, you will have oil all over your valve covers unless the push it breather is REALLY tall.

Frank-id · 10-10-2003, 11:21 AM

A PCV aka positive crankcase valve is required for a health engine. This valve allows any internal pressures to be vented thru the carb. In many cases after removing the hoses and valve the engine will begin to leak oil at the front or rear crankshaft seals. The valve also provides some valve stem lube as the internal vapors are saturated with oil. Some oil vapor makes carbon on the vales also. The systed is designed to draw fresh outside air into a rocker cover vent. The air displaces the internal block air and is drawn into carb base and burned. It is desirable to have a slight vacumm in the block. Carb base bolts should be checked occasionally for tightness, as this is also a good place for poor a seal.

10-10-2003, 10:04 AM	#1
sapmap Registered User Join Date: Oct 2003 Posts: 4	PCV on a 86 350 I recently got a 1986 GMC 1/2 ton with a 350. All smog has been removed, along with the PCV. Is the PCV required. The port on the carb is plugged, and the valve cover has a breather stuck in the hole where the PCV used to be.

10-10-2003, 10:26 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,300	dont know where ya live but ya may not get past inspection without all that stuff. I know here in my area ya wont __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

10-10-2003, 10:41 AM	#3
784X4GUY Did someone say MUD? Join Date: Aug 2003 Location: Pullman,WA Posts: 1,089	i know here in Pheonix you wont get through emissions if you dont have your pcv valve hooked up to the carb. Just buy a new one with some hose and rehook it up __________________ Im in the market guys...so keep ya eyes peeled -------------------- Mini trucks are for guys who cant get it up!

10-10-2003, 10:53 AM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Also if you don't run one, you will have oil all over your valve covers unless the push it breather is REALLY tall. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

10-10-2003, 11:21 AM	#5
Frank-id Registered User Join Date: Sep 2003 Location: Twin Falls, Idaho Posts: 73	Engine breathing A PCV aka positive crankcase valve is required for a health engine. This valve allows any internal pressures to be vented thru the carb. In many cases after removing the hoses and valve the engine will begin to leak oil at the front or rear crankshaft seals. The valve also provides some valve stem lube as the internal vapors are saturated with oil. Some oil vapor makes carbon on the vales also. The systed is designed to draw fresh outside air into a rocker cover vent. The air displaces the internal block air and is drawn into carb base and burned. It is desirable to have a slight vacumm in the block. Carb base bolts should be checked occasionally for tightness, as this is also a good place for poor a seal. Attached Images __________________ Chevy stepper 400sb 350 turbo



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