Alright. Thanks guys!

 

What pump driveshaft are you guys using with the M-10555 Pump?

 

My melling select pump came with a new shaft.

 

did it happen to include a part number with the paperwork?

right now i have the bad design pump (M-55HV) Not by choice i'll deal with that later, And the IS-55E Driveshaft and im wondering if it will work with the M-10555 pump.

 

Before I ordered my Melling Select HV pump, I called the Melling tech support line. The guy I spoke to suggested that I not use the drive shaft that comes with the model 10550 HV pump but to use their chrome moly drive shaft instead (P/N 12550), which I ordered at the same time. As I remember, it was something like $10-$12 from Summit.

 

Thank you, Just contacted George there and he told me the samething. Now i will order a new pump/pickup & Driveshaft.

 

I used the 'regular' tube size canton version #20-020, I believe the 5/8".
Anyway, I have over 1500 road racing miles on the engine using 40 & 50 wt oils screaming around the track between 3500rpm & redline for laps on end. no problems what so ever. so, no, I don't think the 3/4" pickup is necessary

 

Whats wrong with the shaft that comes with the oil pump?

 

Thanks for the input. Im also wondering if there is a noticeable difference from using a bigger inlet.

According to melling the best pump they have with the 25% Increased volume is the 10555 and that needs a 3/4'' Pickup so thats why i was switching from the 5/8ths to 3/4

 

George didn't say, All he said is that is the one they recommend to use with the Hv pump

 

I run a 5/8" pickup in my setup, no difference as far as i can tell.

 

Not sure which one comes with that pump, but some of them come with a plastic coupling which is considered a weak point.

 

The one that came with mine is all steel.