KB243 Hyper Piston Confusion
Before I go inserting my foot in my mouth responding to a UEM Pistons representative, can someone tell me if I'm wrong here? I sent UEM an email asking if the compression height could be reduced by machining a KB243 piston shorter to achieve zero-deck clearance under a closed chamber cylinder head. Here's the response I received: "The deck of KB243.040 sits .012" below block deck @ TDC, on a stock LA/340 block. The .030" dome portion of the piston can safely be milled completely off , for use with a closed chamber head."
By my calculations 6.123(rod)+1.655(half stroke)+1.84(piston compression height)=9.618 assembly length. This is above the deck even with the UEM catalogs suggested OEM deck height of 9.599. Even the catalog indicates the piston is above the deck in that case. See screenshot attached.
My block before milling to flatten is 9.586". I was looking for a zero deck piston option for a street 340 without going to forged pistons.
Did the UEM rep look at a different piston, or am I thinking of this wrong?
Before I go inserting my foot in my mouth responding to a UEM Pistons representative, can someone tell me if I'm wrong here? I sent UEM an email asking if the compression height could be reduced by machining a KB243 piston shorter to achieve zero-deck clearance under a closed chamber cylinder head. Here's the response I received: "The deck of KB243.040 sits .012" below block deck @ TDC, on a stock LA/340 block. The .030" dome portion of the piston can safely be milled completely off , for use with a closed chamber head."
By my calculations 6.123(rod)+1.655(half stroke)+1.84(piston compression height)=9.618 assembly length. This is above the deck even with the UEM catalogs suggested OEM deck height of 9.599. Even the catalog indicates the piston is above the deck in that case. See screenshot attached.
My block before milling to flatten is 9.586". I was looking for a zero deck piston option for a street 340 without going to forged pistons.
Did the UEM rep look at a different piston, or am I thinking of this wrong?