Now, just imagine if you had removed the 273's factory huge wrist pins and replaced them with 8 real light ones and then had the crank re-balanced removing the excess weight there too. A 273 would rev like a Yamaha R1.
Way back in the 1964 model year 273, Ma Mopar being cheap AZZ, used the 'OFF THE SHELF' forged Poly 318 crank. But the 273 piston is much smaller and lighter than the Poly teen's so they used a HEAVY wrist pin to match the 'BOB' weight to the 318's piston.
You can not put your little pinky finger inside the 273 wrist pin, the inside diameter is about 7/16 inch.
So replace those 8 heavy Scheduled 80 pipes and that removes a lot of 'Bob" weight. Then you can machine off a lot of weight off the counter-weights on the crank. Proper reduction can equal over 5 to 6 pounds less rotational weight.
