Holley EFI system. I want to use a Dual Sync distributor for SEFI. I dont know if these are approved. Is there any other option. I need the dual sync to have cam sensor and crank sensors built in .

PM sent

forgive me but what does SEFI stand for.
I am using that distributor for sequential port injection. Holley HP

"sequential port injection. Holley HP" Yes that it.

https://www.holley.com/products/fuel...arts/565-207BK

It looks not to be Marine approved.
​​​​​​​

you will gain little if anything going to SEFI, maybe a little cleaner idle...maybe

When you go sequential you are able to tune each cylinder individually at every RPM.

you may want to look into a hall effect crank trigger on the front of the motor. It is crank mounted and a larger diameter for precise measurement of the crank position.

THen what about the cam sensor needed for sequential?

^ then you could use a late model GM distributor for the cam signal (vortec 5.7).....many options

Started with the Accel dual sync roughly 16 years ago, not the best product but the only one at the time, run the Fast dual sync now for 8 or 10 years, very similar to the MSD / Holley, works great.