q jet ,4 jet jets - Page 2

Mark Yacavone · 04-14-2015, 12:56 AM

Quote:

Originally Posted by ZASKO

if you need a different jet, use what yu have a drill out if going larger.

Z, I'm sure you've done it or you wouldn't have mentioned it..as have I, in a pinch on some weird application.
But, seeing jet holes are broached, not drilled, one could get into some strange flow characteristics there, I would think.

Billy Nees · 04-14-2015, 07:08 AM

Quote:

Originally Posted by Mark Yacavone

Z, I'm sure you've done it or you wouldn't have mentioned it..as have I, in a pinch on some weird application.
But, seeing jet holes are broached, not drilled, one could get into some strange flow characteristics there, I would think.

What Mark said!

Dwight Southerland · 04-14-2015, 08:28 AM

Most of the 4gc carbs from about 1958 up that I have seen used the chamfered entry jets. Some exceptions I remember were from marine applications. 'Back in the day' we collected jets from old carburetors and could resize them a few thous and it seemed to work okay. Cal Custom and EelCo sold sets of Rochester jets, but they were all flat entry and the holes were drilled and they did not work. I chased a .3 et loss for a couple of weeks once that was due to using those jets. I think I threw them all away or gave them to Kenny Faulk or somethin'.

Talk to Deano.

04-14-2015, 08:28 AM	#13
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,002 Likes: 64 Liked 783 Times in 195 Posts	Re: q jet ,4 jet jets Most of the 4gc carbs from about 1958 up that I have seen used the chamfered entry jets. Some exceptions I remember were from marine applications. 'Back in the day' we collected jets from old carburetors and could resize them a few thous and it seemed to work okay. Cal Custom and EelCo sold sets of Rochester jets, but they were all flat entry and the holes were drilled and they did not work. I chased a .3 et loss for a couple of weeks once that was due to using those jets. I think I threw them all away or gave them to Kenny Faulk or somethin'. Talk to Deano. __________________