Pete Phillips Posted August 24, 2017 Share Posted August 24, 2017 Does anyone know if the 198 V-6 pistons are interchangeable with the 215 V-8 pistons in the compact Buicks? I suspect they are not. The 198 pistons are just about impossible to find. Link to comment Share on other sites More sharing options...
Frank DuVal Posted August 25, 2017 Share Posted August 25, 2017 (edited) According to that new highly accurate database, aka Wikipedia , you would have better luck with 264 cu in pistons. Why? Bore and stroke: 198 3.625 x 3.1875 215 3.5 x 2.8 225 3.75 x 3.4 264 3.625 x 3.2 Now I have no idea if the pin diameter or height to top of piston, shape, etc are the same for 264 and 198 pistons. But, 215 and 198 are a definite no go. Edited January 21, 2018 by Frank DuVal Had numbers transposed. (see edit history) Link to comment Share on other sites More sharing options...
NTX5467 Posted August 25, 2017 Share Posted August 25, 2017 Aside from the items mentioned, WEIGHT is another key thing to be concerned about. That affects the engine's "balance" situation. The compression height can relate to how tall the piston is, but ALSO the skirt length and configuration (which relates to crankshaft counterweight clearance). NTX5467 Link to comment Share on other sites More sharing options...
nerdymonkey1010 Posted January 19, 2018 Share Posted January 19, 2018 (edited) ive been wearing myself out as well trying to research this for weeks. the 198 is 3.625" bore by 3.200" stroke. it has a 1.850" compression height and a .875" pin. the 215 bore is too small. only 3.500" the 264 as mentioned above will not work because it has a huge dome piston with a 2.25" compression distance. so far the closest I can find is a Ford 223cid inline 6. 1.84"CH 3.66" bore, but the pin diameter is .905" which would require boring out the connecting rods Frank, your numbers are mixed up. the 215 and 225 are swapped Edited January 19, 2018 by nerdymonkey1010 (see edit history) Link to comment Share on other sites More sharing options...
Beemon Posted January 19, 2018 Share Posted January 19, 2018 Might be easier to spin a 264 piston in a lathe to cut the dome off than to hack up some connecting rods. I do not know if you can get from 2.25" to 1.850" easily, but couldn't hurt to try before permanently altering your also very rare connecting rods. Link to comment Share on other sites More sharing options...
NTX5467 Posted January 20, 2018 Share Posted January 20, 2018 How much you can cut the dome will depend upon the shape of the underside of the piston crown area. It's probably NOT flat, but the contours basically match what's on the top side. Which means "not a good idea" as a thin spot would result at the peak of the dome. NTX5467 1 Link to comment Share on other sites More sharing options...
Frank DuVal Posted January 21, 2018 Share Posted January 21, 2018 Woops, I have the corrected numbers in my post now. Link to comment Share on other sites More sharing options...
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