I am considering replacing my Pro Drive 37 CDI power head which has 40 hours on a rebuild with Delta's Level 3 build with the Pro Drive 40 EFI. I know this is insane- but I've been called worse! What is the difference in performance between these two motors? From the speeds I am seeing posted, it doesn't sound like there is a big loss in power. BUT- I've been around long enough not to trust these numbers so I am curious to hear from people who owned something similar to my build and switched to the 40 EFI.

When I say Delta Level III I am including:

Delta Heads and Cam
Mikuni Carb
BPS Rockers and Push Rods
High RPM Colis
BPS Q Exhaust

I just went from a level 3 to a 40 and I lost 1.5 or so mph and I can’t snap on plane in 2 boat lengths with 3 guys in the boat like I could with my modded motor. I am impressed with the 40 but it isn’t as impressive as a motor with a new cam!

In my 40 GTR with exhaust and a few small upgrades, none of my "level 3" buddy's can pass me. Maybe it's the hull I'm running but my boat doesn't rarely get passed up

I said my buddy can pass me up, what I meant to say was "can't". Baggy can get more performance out of your prop for sure man. I run 28-29 with 4 people, dog, and full hunt load with my 2 blade

Modded CDI or non cdi trumps 40 efi all day, any day, don't care. The 40 is nothing more that a few things here or there but has a better stock profile cam.

Keep the modded block. You'll never recoup your money to make it worth wild.

Nope sure haven't man, just this 40. Maybe it's the boy, but either way, I am happy with it and get the performance I was hoping to get out of it

Nope sure haven't man, just this 40. Maybe it's the boy, but either way, I am happy with it and get the performance I was hoping to get out of it

Boat

You mentioned Jeremey built your boat- that wasn’t Jeremey DeCourt was it?

No, Jeremy Brasseaux out of breaux bridge