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recurving the remanufactured 1976 duraspark distributer i just got. I got the 925D mr gasket recurve springs. I tore the distributer apart to find i had the 13L and the 18L slots. But i noticed something on the "pin" that the spring attaches too. Its a BLACK PLASTIC bushing that fits over the pin to limit the travel of the slot thus decreasing the slot width. Are these bushings suppose to be plastic? that seems weak and i would think it would wear with use. From what im told u should weld the tabs to get the slot width u want but this bushing essentially makes my 13L slot a 10L slot which is perfect.
so if you guys say these bushings are suppose to be plastic and will not wear "fast" then i would put the mr gasket springs on and assemble it back together. Just want to know if the plastic bushing is good to go.
here are some measurements i took..
13L slot = .488"
10L slot = .410"
stock metal pin width (no bushing)= .149"
stock metal pin with bushing = .223"
so the plastic bushing thickness is = .074"
subtract the bushing thickness to the 13L slot width and i get a new slot width of .414" which is super close to the .410" slot width of the 10L.
im planning to run a 241/249 lunati cam with 10.5:1 compression. figure i would max mechanical centrifugal timing at 35degrees total and run 15 degrees static at idle which is why i wanted the 10L slot. the mr gasket recurve springs should allow max advance below 3000 rpms as well.
so if you guys say these bushings are suppose to be plastic and will not wear "fast" then i would put the mr gasket springs on and assemble it back together. Just want to know if the plastic bushing is good to go.
here are some measurements i took..
13L slot = .488"
10L slot = .410"
stock metal pin width (no bushing)= .149"
stock metal pin with bushing = .223"
so the plastic bushing thickness is = .074"
subtract the bushing thickness to the 13L slot width and i get a new slot width of .414" which is super close to the .410" slot width of the 10L.
im planning to run a 241/249 lunati cam with 10.5:1 compression. figure i would max mechanical centrifugal timing at 35degrees total and run 15 degrees static at idle which is why i wanted the 10L slot. the mr gasket recurve springs should allow max advance below 3000 rpms as well.