Nick: Sort of hard to say at this point as the first conversion I added a whole 2nd fuel system to the car so it increased by about 300 Lbs once it was fueled up.
My fuel capacity even with just the LPG tank in this time is +20 litres so there's almost 50 lbs and the LPG tank is very thick...
Another reason the knock goes away is at higher rpm you have enough Oil pressure to keep the Hydraulic Wedge (Oil doesn't compress so if you pump enough in the bearing should never touch the crank) in place so no knock.
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