. If your 1928 Chevy is model AB passenger car, it came with INVAR aluminum pistons. If you have a LO or LP one ton truck, it came with Cast iron pistons tho the rest of the block is like 28 passenger cars. Please look at page #233 of the following web site provided by GM. <https://www.gm.com/content/dam/comp...mation-kits/chevrolet/1928-Chevrolet.pdf>. .
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