The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post

project76 · 12-27-2005, 05:59 PM

The previous owner had #1 on the cap different than you do now. Finding #1 at TDC on compression stroke is easier with 2 people. One can hold there finger over the spark plug hole, while the other cranks little by little till you feel the compression blowing your finger off the hole. That will get you pretty close to where #1 should be on the cap. Sticking a screw driver in the spark plug hole, will determine how far up in the bore the piston is so you can get it damn near dead on, if you have to rotate it by hand the last few inches.

12-27-2005, 05:59 PM	#3
project76 Registered User Join Date: Nov 2004 Location: Cecil County Maryland Posts: 135	Re: backfiring, finding TDC The previous owner had #1 on the cap different than you do now. Finding #1 at TDC on compression stroke is easier with 2 people. One can hold there finger over the spark plug hole, while the other cranks little by little till you feel the compression blowing your finger off the hole. That will get you pretty close to where #1 should be on the cap. Sticking a screw driver in the spark plug hole, will determine how far up in the bore the piston is so you can get it damn near dead on, if you have to rotate it by hand the last few inches. __________________ Brandon project 67 swb bagged on 20" Coddingtons Last edited by project76; 12-27-2005 at 06:01 PM.