Fits all smallblock, 426 Hemi, and big block Mopars
If you've had trouble with unstable idle, detonation, spark scatter etc., this hardened steel collar can sometimes resolve the issue. Slips on distributor shaft to keep oil pump / distributor drive shaft / gear firmly "planted" in the block. This takes out "bounce" between the distributor shaft and drive gear (in block) , preventing gear from moving upwards as oil pump torque varies as each gerotor lobe builds pressure.
Fits all big block (383-400-440), LA and Poly small blocks, and 426 Hemis. Not needed on 318 / 360 Magnums (i.e., '92-93 up) - they are crank-triggered ignition.
Detailed instructions included.
Add low-cost S&H per calculator (see tab above); shipped worldwide.