Thread: Holley 650 dp fuel inlet valve and seat, NEED HELP!!

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I was replacing them in the primary and secondary and got them mixed up which one is the primary and the secondary One has a H and the other HH.
Thanks Eric

Doesn't matter on the Holley Dual feed. I am dusting cobwebs of my brain about the H and HH. Orifice comes to mind for flow rates. Anybody else wants to jump in here, it would be appreciated. The standard needle and seat assemblies for these things have the same height and O-ring placement, so as for astectics are concerned, it doesn't matter because they will work in each hole. Just lube them with crc or wd-40 or what ever cranks your scooter before placing them in the hole.

There is a length diffrence one is longer then the other thats what getting me wery.

Thanks Nuck...I'm gonna hafta get out my holley books and refresh my memory. I just don't hav those old brain cells left to recall that info.

Can you post a picture? What you could have is both windows and holes.

most likley the longest one will go in the front, g forces ya know , that would be my guess and it is a guess

Originally Posted by krazziee

most likley the longest one will go in the front, g forces ya know , that would be my guess and it is a guess

In my Holley Carburetor Handbook the needle/seat assemblies are listed by flow rates with the "hole" type (also shortest) being used in low flow applications.