2818-1 metering blocks

[John P.]

I'm looking for pictures of the primary (4094), and secondary (4099), metering blocks. Both sides if possible.

I'm finding some surprises as I rebuild the carb on my 65 L76, and would like to confirm that these are correct, or some unoriginal, but correctly stamped metering blocks. Of particular concern is the power valve on the secondary side with no vacuume source, and no idle restrictions on the primary side. Just seems odd...

Thanks in advance!

John

[Timothy B.]

Re: 2818-1 metering blocks

John, I can't help with pictures but the idle restrictors on the metering blocks are pressed in and should be located low and feed by a larger hole from the main well.

[John P.]

Re: 2818-1 metering blocks

John, I can't help with pictures but the idle restrictors on the metering blocks are pressed in and should be located low and feed by a larger hole from the main well.

Yes, the secondary block has brass restrictions pressed in, but the primary does not. I'm thinking that the primary should have .031 restrictions.

Thanks

[Timothy B.]

Re: 2818-1 metering blocks

John,

.031 sounds right, is the primary block tapped for 6-32 thread. If not you can tap and install brass 6-32 set screws drilled at .031 and you should be good to go. How about the emulsion bleeds, there should be two on each side of the main well with a deeper hole inside approx .028.

[John P.]

Re: 2818-1 metering blocks

John,

.031 sounds right, is the primary block tapped for 6-32 thread. If not you can tap and install brass 6-32 set screws drilled at .031 and you should be good to go. How about the emulsion bleeds, there should be two on each side of the main well with a deeper hole inside approx .028.

Thanks Timothy,

That sounds like a good plan for the idle jets. The block does have the proper looking emulsion bleeds plus one more higher up. I've attached a pic of the primary block.

What is your take on the power valve in the secondary? My understanding that most Holleys do not use power valves in the secondary. Since there is no vacuume source, the power valve is open all of the time The same thing could be accomplished with lager jets. I'm considering placing a blank in the secondary block power valve opening. The current jet size is 76, which is the specified size.

Thanks,

John