340 crank with 318 harmonic balancer?
BTW, I'm running a 1965 273 harmonic balancer on my 340. Also a 1965 273 timing cover. Reason being it's a late 340 block (71) and its original timing cover and damper have the timing marks in the wrong place for an early cast iron water pump and radiator - at least if you don't want the timing marks hidden by the lower radiator hose. According to my white book, damper pn 2658458 was used on 273, 318 and 340 from 66 through 69 (with the short cast iron water pump and driver's side lower radiator hose). The 64-65 273 damper has a different part number, but will fit 318/340, at least if you use a 273 crank pulley. For some reason there is another 66-67 318 damper, pn 2658459. Have no idea why (C body maybe?).
Yes. And if you keep on running it, the damper will eventually just come apart. Not good.
BTW, I'm running a 1965 273 harmonic balancer on my 340. Also a 1965 273 timing cover. Reason being it's a late 340 block (71) and its original timing cover and damper have the timing marks in the wrong place for an early cast iron water pump and radiator - at least if you don't want the timing marks hidden by the lower radiator hose. According to my white book, damper pn 2658458 was used on 273, 318 and 340 from 66 through 69 (with the short cast iron water pump and driver's side lower radiator hose). The 64-65 273 damper has a different part number, but will fit 318/340, at least if you use a 273 crank pulley. For some reason there is another 66-67 318 damper, pn 2658459. Have no idea why (C body maybe?).
