Greg Lib Posted March 3, 2021 Share Posted March 3, 2021 Hello, I have a problem with identifying my engine because I have the number 1185485 on the engine, which means 401, but after disassembling the engine, the pistons have a size of 4.09. I need new bigger pistons but I don't know where to find one. I do not know what this engine block is and where the difference comes from. . Link to comment Share on other sites More sharing options...
gungeey Posted March 3, 2021 Share Posted March 3, 2021 Its a 364, head castings not much meaning. whats the stamp below the left side of the thermostat housing? ...a couple letters maybe scrape some paint. Dont be discouraged yet, theres some mutants out there with hi-po parts Link to comment Share on other sites More sharing options...
drhach Posted March 3, 2021 Share Posted March 3, 2021 Check your measurements again. You just need one piston? Link to comment Share on other sites More sharing options...
Greg Lib Posted March 4, 2021 Author Share Posted March 4, 2021 I will try to check what the marking is there. it needs a whole set of pistons Link to comment Share on other sites More sharing options...
Greg Lib Posted March 4, 2021 Author Share Posted March 4, 2021 I have something like this Link to comment Share on other sites More sharing options...
Greg Lib Posted March 8, 2021 Author Share Posted March 8, 2021 does anyone know what engine it is and where I can find such pistons Link to comment Share on other sites More sharing options...
JZRIV Posted March 8, 2021 Share Posted March 8, 2021 (edited) Are there any other stamps on the valley pan surface that you have pictured above? Thinking the 3F may be the identifier which indicates a 1959 364. The piston part number seems to match up to a 364 based on internet search as well as the head number comes up as 364/401/425. Go to Teambuick.com tons of Buick engine numbers Edited March 8, 2021 by JZRIV (see edit history) 1 Link to comment Share on other sites More sharing options...
telriv Posted March 8, 2021 Share Posted March 8, 2021 I can have custom made Forged pistons for your engine. I will need to know ALL the specs. Tom T. Link to comment Share on other sites More sharing options...
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