Jahns use to offer high compression pistons for 216-235-261 engines.1956 is the year Chevy quit using shims on the main bearings and started using finished inserts.You would think that they would have done it in 1955 with all the other changes.(TECH TIP) get a FACTORY SHOP MANUAL for the year of car or truck engine you are working on.Those aftermarket repair manuals don't have enough information and what they do have is not always correct.A FACTORY MASTER PARTS CATALOG is also a must.A HOLLANDER EXCHANGE MANUAL used by wrecking yards can also come in handy.
EvilDr235
