I worked with Michael Doty to come up with a pulley and trigger wheel combo that fits with a stock water pump and keeps the stock pulley alignment.

This combination should work for guys who want a full featured EFI system but they want to keep the stock water pump and alternator and have a fairly stock looking engine.

That's something I may need. What damper options is it setup to work with?

It is designed to work with an ATI damper. The ATI damper is thicker than stock which is what is required to work with the shorter Doty pulley.

andy, what diameter are the water pump and crank pulleys ? TIA.

The Doty pulley is 5.75 OD but I don't think that is the correct way to measure a pulley. The actual drive portion of the pulley is smaller, maybe closer to 5 inches.

Yes, you need the pitch diameter. I don't know how to find it, though.
R.

Hi Andy, is this crank wheel the same part as the AR402DM you currently have on your website or is this a new part not yet available? Also do you have a part number for the Doty pulley?

Thanks,

Steve

This is a new part number that isn't on the website yet. The Doty pulley is also new and not available yet. He sent me a prototype and I built a few trigger wheels to prove out the concept but he hasn't built a production run of pulleys yet.

Thanks Andy, you guys got me really thinking hard about MPI and CnP on my current 512 low deck build.

Steve

I'm going to switch my street car over to EFI with CNP so I'll have these parts available in the near future. I still need to design up a sensor bracket for the combination since my existing ones are too short. Not a high priority project for me at the moment but I've got it on the list.