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Elsie72 · 11-13-2007, 05:10 PM

Update - Well, it turns out that the dented valve cover was more than just superficial damage. There were bent valves on the #1 and #7 holes causing some sticking and what-not. GM pulled the head and sent it to the machine shop for new valves and guides, and I'm back on the road. I guess that's what the 12 month warranty is for. I spent the morning tuning up the vacuum advance, swapped in a lighter vacuum secondary spring, andd trimmed out the idle mixture screws some. Now the truck runs very strong, and I'm a happy camper again!

11-13-2007, 05:10 PM	#8
Elsie72 Chinook Arch Join Date: Feb 2005 Location: High River, Alberta, Canada Posts: 218	Re: Engine Swap Progress Update - Well, it turns out that the dented valve cover was more than just superficial damage. There were bent valves on the #1 and #7 holes causing some sticking and what-not. GM pulled the head and sent it to the machine shop for new valves and guides, and I'm back on the road. I guess that's what the 12 month warranty is for. I spent the morning tuning up the vacuum advance, swapped in a lighter vacuum secondary spring, andd trimmed out the idle mixture screws some. Now the truck runs very strong, and I'm a happy camper again! __________________ 1972 GMC 1500 Custom - Bought used by Grandpa in '74, currently back on the road after a long hiatus. Elsie's truck 2.5" dual exhaust with Hooker Aero Chambers Holley 670 Street Avenger Edelbrock Performer RPM on GMPP 290HP 350 ECE drop 3.5/5