new needle valves

[brichter]

I ordered some needle valves and seats from McDonald and when they arrived, I noticed that the ends of the needle valves was flat instead of sharp to fit the taper of the seat. Have they changed the design or did they send me the wrong needle valves.

[Bob McCarty]

BR, They were having problems with the quality of viton needles (sticking, leaking, etc.) . Morgan told me that they spent over a year testing this design. If you look in the bottom of the needle seat, you'll see a small raised ridge that the flat pad seals against. Someone (I think Gary Dotson) mentioned that these were similar in design to an old Holley needle and seat.

[Gary Dotson]

An aftermarket supplier had those available for Holley carbs. quite a few years ago. I encountered a few of them while doing carb. rebuilds. I guess they worked o.k. I tried one that I got from Morgan, in an "H" last year and I couldn't make it seal. I gave up on it and put the original needle & seat back in. All is well!

[Bob McCarty]

Personally, I still think the steel needles are best, but they are expensive.

[SONNY]

YUP---can't beat the good ole steel ones!

[Don McCombs]

Personally, I still think the steel needles are best, but they are expensive.