gas leak? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vtwinsport · 05-25-2009, 01:50 PM

Well here's something to consider for those ordering parts with a rebuilt engine. Went looking for the block casting number and Engine Code. Googled my codes and found that the core was cast in 1975. A few posts ago I noted that my harmonic balancer wasn't lining up with my timing cover marks on the tab when I used a TDC tool to find true TDC. It appears I have a timing cover from a later period than my core. This core type was cast from 68 to 79. I think the timing cover tab moved to the 12 oclock position from 80 on.

All that stated, my HB may have not slipped then. My TDC mark was around 3 oclock position but the tab was at 12. It was the wrong timing cover.
Thanks to O'rielly Auto parts for that.
FYI.

05-25-2009, 01:50 PM	#1
vtwinsport Registered User Join Date: Nov 2008 Location: edmonton, alberta Posts: 293	Re: gas leak? Well here's something to consider for those ordering parts with a rebuilt engine. Went looking for the block casting number and Engine Code. Googled my codes and found that the core was cast in 1975. A few posts ago I noted that my harmonic balancer wasn't lining up with my timing cover marks on the tab when I used a TDC tool to find true TDC. It appears I have a timing cover from a later period than my core. This core type was cast from 68 to 79. I think the timing cover tab moved to the 12 oclock position from 80 on. All that stated, my HB may have not slipped then. My TDC mark was around 3 oclock position but the tab was at 12. It was the wrong timing cover. Thanks to O'rielly Auto parts for that. FYI. __________________ 76 Silverado, 2wd, long box, 350/th350, 3.42 posi, edelbrock performer 64cc heads, edelbrock 1405, 2101 intake, Hedman Headers, Comp Cam XE262 http://beerbreadbike.wordpress.com/



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