Stumped by a timing problem - Page 3 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**slomotion** · 04-23-2015, 06:31 PM

Thank you Mechanicalman.
Let me add one more item to look at.....if your distributor goes south again, pull it out, push the lock pin out of the drive gear, pull the gear off and replace your thrust washer on the distributor shaft. When the engine is running, your cam gear is trying to push the dist. shaft up because of the angle of the gear teeth. At lower RPM, it may not be noticeable, but at higher RPM the rotor may be striking the cap.

tranz am · 04-24-2015, 01:25 AM

Quote:

Originally Posted by MAC71

After the cap replacement the backfire is gone but it has a lean surge now but that's a jet change.
So before the rebuild with the points it had to have been the timing chain but the bad distributor cap looks to be the problem after the rebuild.

Thank you all for the help I would have never thought the cap

Glad to help with this. Sometimes its the small simple things that we just didnt think about.

Norgermish · 04-24-2015, 04:38 AM

It has been mentioned already but, I remember building a 396 for a lake boat. It ran great at Nacimiento Lake here in central ca. then he moved to Lake Tahoe and it ran like crap...it was the altitude

04-23-2015, 06:31 PM	#51
slomotion Old Duffer Join Date: Mar 2003 Location: Maine Posts: 1,822	Re: Stumped by a timing problem Thank you Mechanicalman. Let me add one more item to look at.....if your distributor goes south again, pull it out, push the lock pin out of the drive gear, pull the gear off and replace your thrust washer on the distributor shaft. When the engine is running, your cam gear is trying to push the dist. shaft up because of the angle of the gear teeth. At lower RPM, it may not be noticeable, but at higher RPM the rotor may be striking the cap. __________________ '68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve." Last edited by slomotion; 04-23-2015 at 06:56 PM.

04-24-2015, 04:38 AM	#53
Norgermish Registered User Join Date: Jan 2015 Location: Salinas Posts: 65	Re: Stumped by a timing problem It has been mentioned already but, I remember building a 396 for a lake boat. It ran great at Nacimiento Lake here in central ca. then he moved to Lake Tahoe and it ran like crap...it was the altitude



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