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Re: Swapping a 69 Chevy body onto a 97 Cummings chassis
They're 7mm. 9mm were the non intercooled 89-91 engines. They were prone to cracking there by the injector bore. Different than the navistar or 53 blocks due to inferior casting and/or low nickel content.
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Tony
1985 GMC K2500 restoration Project: Rust, White & Blue
1989 Chevy R3500 CC Cummins & 4X4 swap some day...
1989 Burb (D60, 14BFF, 12V, NV4500, NP205, 37" tires in progress)
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