quick timing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69heavychevy · 03-17-2008, 08:43 AM

tdc #1, should the cam gear be at 6 o'clock or 12 o'clock?

**El Jay** · 03-17-2008, 09:44 AM

I'm assuming you have the front off the motor, & it's a V-8.

The index mark on the cam shaft (big) sprocket should be @ 6 o'clock, & the index for the crank sprocket should be @ 12 o'clock.

There should be an imaginary vertical line from the center of the cam to the center of the crank that passes through both indices.

I hope this helps you.

El Jay

slammed1 · 03-17-2008, 09:54 AM

Also the crank keyway should be facing imaginary 2 o'clockfor top dead center.
Here is an illustration (disregard the "hemi" parts)

69heavychevy · 03-17-2008, 09:55 AM

thats what i thought, but i saw a write up on here on changing a cam. on there the guy said tdc #1 was with both marks on the sprockets pointing towards 12 o'clock. got me a little confused. thanks for clearing it up.

69heavychevy · 03-17-2008, 09:58 AM

finally got everything put back together, but hadnt fired it up. then i saw that and i was like oh oh, i really hope he's wrong.

slammed1 · 03-17-2008, 10:12 AM

from SuperChevy,the black arrows point to the dowels on the crank and cam in relation to marks.
http://images.superchevy.com/technic..._and_chain.jpg

03-17-2008, 09:44 AM	#2
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: quick timing question I'm assuming you have the front off the motor, & it's a V-8. The index mark on the cam shaft (big) sprocket should be @ 6 o'clock, & the index for the crank sprocket should be @ 12 o'clock. There should be an imaginary vertical line from the center of the cam to the center of the crank that passes through both indices. I hope this helps you. El Jay __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

03-17-2008, 09:54 AM	#3
slammed1 1972 Chevrolet SWB Join Date: Jan 2008 Location: FT Smith AR Posts: 512	Re: quick timing question Also the crank keyway should be facing imaginary 2 o'clockfor top dead center. Here is an illustration (disregard the "hemi" parts) __________________ My New thread with pics (not my build thread yet.) http://67-72chevytrucks.com/vboard/s...46#post2573646 1972 Chevrolet 1/2 ton short wide bed,68 frt clip Project. 1980 Camaro Inherited when father passed,68K Miles 2003 Ford Mach1 FUN as Hell!! 2002 Dodge Ram 5-8 slam Rolling BillBoard (Gone not forgot) 2004 Dodge Ram HEMI 10" lifted on 37's and 2wd.

03-17-2008, 09:55 AM	#4
69heavychevy Registered User Join Date: Jan 2007 Location: Garland,TX Posts: 431	Re: quick timing question thats what i thought, but i saw a write up on here on changing a cam. on there the guy said tdc #1 was with both marks on the sprockets pointing towards 12 o'clock. got me a little confused. thanks for clearing it up.

03-17-2008, 09:58 AM	#5
69heavychevy Registered User Join Date: Jan 2007 Location: Garland,TX Posts: 431	Re: quick timing question finally got everything put back together, but hadnt fired it up. then i saw that and i was like oh oh, i really hope he's wrong.

03-17-2008, 10:12 AM	#6
slammed1 1972 Chevrolet SWB Join Date: Jan 2008 Location: FT Smith AR Posts: 512	Re: quick timing question from SuperChevy,the black arrows point to the dowels on the crank and cam in relation to marks. http://images.superchevy.com/technic..._and_chain.jpg __________________ My New thread with pics (not my build thread yet.) http://67-72chevytrucks.com/vboard/s...46#post2573646 1972 Chevrolet 1/2 ton short wide bed,68 frt clip Project. 1980 Camaro Inherited when father passed,68K Miles 2003 Ford Mach1 FUN as Hell!! 2002 Dodge Ram 5-8 slam Rolling BillBoard (Gone not forgot) 2004 Dodge Ram HEMI 10" lifted on 37's and 2wd. Last edited by slammed1; 03-17-2008 at 10:18 AM.

03-17-2008, 08:43 AM	#1
69heavychevy Registered User Join Date: Jan 2007 Location: Garland,TX Posts: 431	quick timing question tdc #1, should the cam gear be at 6 o'clock or 12 o'clock?

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