setting the timing on my 71 w/ 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Brentley · 07-01-2003, 12:27 AM

i am having problems setting the timing on my 71 with a 350 - stock - it has a miss in it -

Brentley · 07-01-2003, 12:33 AM

i have set the timing 10 times already - can somebody tell me what the problem is? i have had to pull the front of the motor back off (a motor that i have just built - 2 hrs max) the timing marks on the timing gears are aligned but the distributor is pointed towards the passenger's door - when number one piston is up, the distributor is pointing toward number but the timing marks are not together - the crank gear is at 12 o'clock and the cam gear is at 12 o'clock - is it a half turn out of timing? when one is up and the distributor is pointing at one do the timing points on the gears need to be the crank gear at 12 o'clock and the cam gear at 6 o"clock? please help me - it will run but with a great miss - it won't pull a hill but will idle decent - i am planning on taking it to a show in NC on Thursday so anyone can help please do!! thanks, Brent

chevyman1970 · 07-01-2003, 03:37 AM

Brent,
It sounds like you are setting your timing when your number six piston. The timing marks on your crank and cam should line up, cam mark shoud be at 6 o'clock and the mark on the crank shoud be on 12 o'clock. Piston number one and six are in top dead center when you line up the timing marks. Just remember to position the distributor pointing to the number one piston. When you say it is pointing towards the passanger side, then it is pointing to the number six piston. You might bring the number one piston to top dead center, but; since the number six piston is also in top dead center, you might have it 180 degrees off. Crank it one more revolution untill the timing marks line up. If you position the distributor right and it still back fires, then you might need to advance the timing or decrease the timing. You need to find out what is the best timing for the cam you are using. Some cams need to be around 10-12 degrees after top dead center. You could find out by calling the cam's manufacture. they would usually help you.
Well, I hope this information helps.

**CPNE** · 07-01-2003, 11:20 AM

ttt

07-01-2003, 12:27 AM	#1
Brentley Registered User Join Date: Jan 2001 Location: Chattanooga, Tn USA Posts: 19	setting the timing on my 71 w/ 350 i am having problems setting the timing on my 71 with a 350 - stock - it has a miss in it -

07-01-2003, 12:33 AM	#2
Brentley Registered User Join Date: Jan 2001 Location: Chattanooga, Tn USA Posts: 19	setting the timing i have set the timing 10 times already - can somebody tell me what the problem is? i have had to pull the front of the motor back off (a motor that i have just built - 2 hrs max) the timing marks on the timing gears are aligned but the distributor is pointed towards the passenger's door - when number one piston is up, the distributor is pointing toward number but the timing marks are not together - the crank gear is at 12 o'clock and the cam gear is at 12 o'clock - is it a half turn out of timing? when one is up and the distributor is pointing at one do the timing points on the gears need to be the crank gear at 12 o'clock and the cam gear at 6 o"clock? please help me - it will run but with a great miss - it won't pull a hill but will idle decent - i am planning on taking it to a show in NC on Thursday so anyone can help please do!! thanks, Brent

07-01-2003, 11:20 AM	#4
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	ttt __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

07-01-2003, 03:37 AM	#3
chevyman1970 Registered User Join Date: Jul 2002 Location: SAN PEDRO CALIFORNIA Posts: 62	Brent, It sounds like you are setting your timing when your number six piston. The timing marks on your crank and cam should line up, cam mark shoud be at 6 o'clock and the mark on the crank shoud be on 12 o'clock. Piston number one and six are in top dead center when you line up the timing marks. Just remember to position the distributor pointing to the number one piston. When you say it is pointing towards the passanger side, then it is pointing to the number six piston. You might bring the number one piston to top dead center, but; since the number six piston is also in top dead center, you might have it 180 degrees off. Crank it one more revolution untill the timing marks line up. If you position the distributor right and it still back fires, then you might need to advance the timing or decrease the timing. You need to find out what is the best timing for the cam you are using. Some cams need to be around 10-12 degrees after top dead center. You could find out by calling the cam's manufacture. they would usually help you. Well, I hope this information helps.



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