Swapped Intakes Now Trucks isnt Running Right - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**DreamRyder1963** · 01-21-2014, 02:33 PM

I swapped the offenhauser 360 degree intake on my truck for a Edelbrock Performer EPS. The truck still runs but just barely. I have had tho advance the distributor well past where it was for the 360 intake. When you try to take off the truck bogs down and tries to stall. If you keep the rpms up you can take off but it shutters and jerks all the way through the gears. I think is also running rich. I starting to think that the jets are not stock in the carb (its a Holley 600). Anything else I'm missing?

geezer#99 · 01-21-2014, 02:48 PM

What was the original timing and what do you need to set it at to run right?

**LockDoc** · 01-21-2014, 03:03 PM

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Also, is it the same carb?

LockDoc

**DreamRyder1963** · 01-21-2014, 03:14 PM

It is the same carb. I do not know the exact numbers because the timing tab on my truck doesn't have numbers just notches. It was between the first and second notches with the 360. I do not know where it is showing on the tab right now. I was rushed yesterday. I do know that the vacuum advance is rotated further. The lines on the advance are at their limit. They were not like that originally.

**LockDoc** · 01-21-2014, 03:18 PM

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Sounds like you might have the dist. at least one tooth off. I would check that, re-check plug wires, and check for vacuum leaks. Maybe geezer will have some more ideas...

LockDoc

**DreamRyder1963** · 01-21-2014, 03:22 PM

I made sure I pulled and installed at TDC but I will double check. I thought vacuum leak so I sprayed car cleaner around the carb and intake gaskets. It didn't change the idle.

CC69Rat · 01-21-2014, 03:22 PM

Sounds like the dist is about two teeth off.

Pull the #1 spark plug and rotate the engine around to TDC. See there the rotor is pointing.. maybe post up a picture and well help you get it figured out.

With the engine at TDC the rotor should be 'pointing' at #1 (or relatively close)

Good place to start anyway

CC69Rat · 01-21-2014, 03:24 PM

^^ sorry for the double post there,.. I guess we were typing at the same time.

**DreamRyder1963** · 01-21-2014, 03:37 PM

Well I guess I know what I'm doing when I get home.

geezer#99 · 01-21-2014, 03:50 PM

You don't need numbers on the timing tab if you know each line on it is 2 degrees.
Plug the vac line to the carb, set your timing at 12 and see if that helps.
Check for vacuum leaks too.
Also one thing lots of people don't know about is that if you put a longer bolt in a bolt hole that has a pushrod lined up with it, that the longer bolt can interfere with the pushrod action holding a valve open causing poor running.
Also check the float level in your carb as a last resort if you find nothing else.

CC69Rat · 01-21-2014, 04:33 PM

The ole #5 and #7 spark plug wires getting crossed up could cause it too.

1,8,4,3,6,5,7,2 It's easy to get 5 and 7 crossed when you put things back together. Ask me know I know

**Ol Blue K20** · 01-21-2014, 04:57 PM

Quote:

Originally Posted by CC69Rat

The ole #5 and #7 spark plug wires getting crossed up could cause it too.

1,8,4,3,6,5,7,2 It's easy to get 5 and 7 crossed when you put things back together. Ask me know I know

X2 I have seen it more than once

**DreamRyder1963** · 01-21-2014, 10:00 PM

It looks like the Distributor was off a tooth. The truck is running much better now thanks for the help.

**LockDoc** · 01-21-2014, 10:03 PM

Quote:

Originally Posted by DreamRyder1963

It looks like the Distributor was off a tooth. The truck is running much better now thanks for the help.

Glad you got it sorted...

LockDoc

01-21-2014, 02:48 PM	#2
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,731	Re: Swapped Intakes Now Trucks isnt Running Right What was the original timing and what do you need to set it at to run right?

01-21-2014, 03:03 PM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: Swapped Intakes Now Trucks isnt Running Right - Also, is it the same carb? LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

01-21-2014, 03:14 PM	#4
DreamRyder1963 Senior Member Join Date: Jul 2012 Location: Knoxville, TN Posts: 499	Re: Swapped Intakes Now Trucks isnt Running Right It is the same carb. I do not know the exact numbers because the timing tab on my truck doesn't have numbers just notches. It was between the first and second notches with the 360. I do not know where it is showing on the tab right now. I was rushed yesterday. I do know that the vacuum advance is rotated further. The lines on the advance are at their limit. They were not like that originally. __________________ 1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/

01-21-2014, 03:22 PM	#6
DreamRyder1963 Senior Member Join Date: Jul 2012 Location: Knoxville, TN Posts: 499	Re: Swapped Intakes Now Trucks isnt Running Right I made sure I pulled and installed at TDC but I will double check. I thought vacuum leak so I sprayed car cleaner around the carb and intake gaskets. It didn't change the idle. __________________ 1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/

01-21-2014, 03:24 PM	#8
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,212	Re: Swapped Intakes Now Trucks isnt Running Right ^^ sorry for the double post there,.. I guess we were typing at the same time. __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

01-21-2014, 02:33 PM	#1
DreamRyder1963 Senior Member Join Date: Jul 2012 Location: Knoxville, TN Posts: 499	Swapped Intakes Now Trucks isnt Running Right I swapped the offenhauser 360 degree intake on my truck for a Edelbrock Performer EPS. The truck still runs but just barely. I have had tho advance the distributor well past where it was for the 360 intake. When you try to take off the truck bogs down and tries to stall. If you keep the rpms up you can take off but it shutters and jerks all the way through the gears. I think is also running rich. I starting to think that the jets are not stock in the carb (its a Holley 600). Anything else I'm missing? __________________ 1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/

01-21-2014, 03:18 PM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,771	Re: Swapped Intakes Now Trucks isnt Running Right - Sounds like you might have the dist. at least one tooth off. I would check that, re-check plug wires, and check for vacuum leaks. Maybe geezer will have some more ideas... LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

01-21-2014, 03:37 PM	#9
DreamRyder1963 Senior Member Join Date: Jul 2012 Location: Knoxville, TN Posts: 499	Re: Swapped Intakes Now Trucks isnt Running Right Well I guess I know what I'm doing when I get home. __________________ 1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/

01-21-2014, 03:50 PM	#10
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,731	Re: Swapped Intakes Now Trucks isnt Running Right You don't need numbers on the timing tab if you know each line on it is 2 degrees. Plug the vac line to the carb, set your timing at 12 and see if that helps. Check for vacuum leaks too. Also one thing lots of people don't know about is that if you put a longer bolt in a bolt hole that has a pushrod lined up with it, that the longer bolt can interfere with the pushrod action holding a valve open causing poor running. Also check the float level in your carb as a last resort if you find nothing else.

01-21-2014, 04:33 PM	#11
CC69Rat Registered User Join Date: Jan 2011 Location: Chattanooga TN Posts: 6,212	Re: Swapped Intakes Now Trucks isnt Running Right The ole #5 and #7 spark plug wires getting crossed up could cause it too. 1,8,4,3,6,5,7,2 It's easy to get 5 and 7 crossed when you put things back together. Ask me know I know __________________ Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 Currently underway 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet Sold 1985 Silverado Short Fleet Sold 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride)

01-21-2014, 10:00 PM	#13
DreamRyder1963 Senior Member Join Date: Jul 2012 Location: Knoxville, TN Posts: 499	Re: Swapped Intakes Now Trucks isnt Running Right It looks like the Distributor was off a tooth. The truck is running much better now thanks for the help. __________________ 1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/

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