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Thanks for the help guys!! I pulled the valve cover and got the number: 3975950. Here's what mortec.com says about them...
3975950....68-70...oval...OPEN...396, 402 Truck, 366T, 427T
Now, how can I find out the cc of the combustion chamber??
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//JimmyBum//
`70 1/2T LWB GMC Sierra Grande; 402BB/TH400
`72 1/2T LWB GMC Sierra; 402BB/TH400
`88 Lincoln Mark VII LSC
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