allmost impossible to read timing tab - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Cramitthefrog · 11-13-2011, 11:25 AM

It sounds like you are hooked up to manifold vacuum and it is pulling more advance at idle. Try the ported side and also pull off the cap and make sure everything is moving freely. On my gas 400 motor I am running 8 BTDC and a total of 34 at about 3000 rpm with the vaccum advance unhooked. I also verified TDC by pulling #1 spark plug and inserting a wire so when someone rotates the motor over you can feel exactly when it has hit TDC, then check the mark. That is how I found out my mark was not on.

MalibuSSwagon · 11-14-2011, 03:37 AM

I never had a problem reading the stock timing tab. Had to clean it first of course. I just looked straight down where you see the little tube right above it, perfect. Was able to read timing and adjust the dizzy myself.

oily · 11-14-2011, 04:50 PM

Anybody know what the little tube is for?

kikkegek · 11-15-2011, 06:09 AM

Quote:

Originally Posted by oily

Anybody know what the little tube is for?

I was told it is to hold some tool, but havent got around to finding it...

anybody?

motornut · 11-15-2011, 11:42 AM

i thought it just put you reading it at the right angle,not from the side

11-14-2011, 03:37 AM	#2
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	Re: allmost impossible to read timing tab I never had a problem reading the stock timing tab. Had to clean it first of course. I just looked straight down where you see the little tube right above it, perfect. Was able to read timing and adjust the dizzy myself. __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi

11-14-2011, 04:50 PM	#3
oily Registered User Join Date: Oct 2010 Location: Vancouver BC Posts: 57	Re: allmost impossible to read timing tab Anybody know what the little tube is for?

11-15-2011, 11:42 AM	#5
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: allmost impossible to read timing tab i thought it just put you reading it at the right angle,not from the side __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350

11-13-2011, 11:25 AM	#1
Cramitthefrog It's always something Join Date: Jan 2011 Location: Carson City N.V. Posts: 59	Re: allmost impossible to read timing tab It sounds like you are hooked up to manifold vacuum and it is pulling more advance at idle. Try the ported side and also pull off the cap and make sure everything is moving freely. On my gas 400 motor I am running 8 BTDC and a total of 34 at about 3000 rpm with the vaccum advance unhooked. I also verified TDC by pulling #1 spark plug and inserting a wire so when someone rotates the motor over you can feel exactly when it has hit TDC, then check the mark. That is how I found out my mark was not on. Last edited by Cramitthefrog; 11-13-2011 at 11:31 AM.



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