Carb size ?

GTX JOHN · 10-09-2020, 05:15 PM

Carbs still need to be the original Specs/Dimensions including boosters/Throttle blades. have

I prefer the Edelbrock Replacement Q Jets.
I have several in great shape and even NOS.!

I believe a 750 must replace a 750
and 800 replace a 800.

You can easily look down the throat to see the difference.

Believe it or not = I used to race a National Recording Holding 86 Ram 100 with
a Q jet.

Billy Nees · 10-09-2020, 05:23 PM

Quote:

Originally Posted by GTX JOHN

Carbs still need to be the original Specs/Dimensions including boosters

Yeah, I wish that this were true John but look at all of the replacement Holleys that have "down-leg" boosters. The only thing that matters anymore is throttle bore and venturi size.

Jeff Stout · 10-09-2020, 05:49 PM

Thanks for the response. Saves my testing that idea.

GTX JOHN · 10-09-2020, 09:03 PM

Quote:

Originally Posted by Billy Nees

Yeah, I wish that this were true John but look at all of the replacement Holleys that have "down-leg" boosters. The only thing that matters anymore is throttle bore and venturi size.

Really?

Glad I still have a lathe and my moto tools

Does fuel inlet position still matter?

I think we are going to find a tenth!

Billy Nees · 10-10-2020, 07:32 AM

Quote:

Originally Posted by GTX JOHN

Does fuel inlet position still matter?

Not since they let the Edelbrock Q-Jets in.

GTX JOHN · 10-10-2020, 04:25 PM

Quote:

Originally Posted by Billy Nees

Not since they let the Edelbrock Q-Jets in.

Thanks .....The price just doubled on all mine =
Better than the Stock Market!

Dave Noll · 10-10-2020, 04:42 PM

Quote:

Originally Posted by GTX JOHN

Really?

Glad I still have a lathe and my moto tools

Does fuel inlet position still matter?

I think we are going to find a tenth!

Careful though. I slowed mine down .3 doing that in the wrong area.

GTX JOHN · 10-10-2020, 10:46 PM

Quote:

Originally Posted by Dave Noll

Careful though. I slowed mine down .3 doing that in the wrong area.

Thanks Dave:

Fortunately I have almost 200 Thermoquads on the shelf. Plus
25 Q Jets.

When my son Jon was about 5 = I gave him a big high sided
garden wagon and a Wallet full of $5.00 Bills when we went to the
Pomona Swap meet every month. Then he would spend the weekmend
trying to buy every Thermoquad he found for $5.00. A few of the
Mopar racers on this site still remember seeing him every month and selling him a few.
He is pretty familiar with them by now 25 years later.

Dave Noll · 10-13-2020, 08:51 PM

200? Wow , I was considering myself kinda lucky having 5 virgin Holley boosters. That's after I've ruined 2 already, they M i g h t be saveable.

Love that story.
Curious, I know the primaries are small, are TQ's very good on fuel mileage? Without getting driveability issues?

GTX JOHN · 10-14-2020, 04:15 PM

For a carb and not FI they we pretty good on MPG for
the 70's. If you got the rear Air Door adjustment dead correct
they were pretty fair on drivability. However not so much the
71 first year versions only 340s. They were recalled and replaced
with the different metering 72 version for drivability issues=
Although I prefer the 71 for the race track if can find them and
the unique jets and other stuff.

10-09-2020, 05:15 PM	#1
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,736 Likes: 2,808 Liked 2,488 Times in 698 Posts	Re: Carb size ? Carbs still need to be the original Specs/Dimensions including boosters/Throttle blades. have I prefer the Edelbrock Replacement Q Jets. I have several in great shape and even NOS.! I believe a 750 must replace a 750 and 800 replace a 800. You can easily look down the throat to see the difference. Believe it or not = I used to race a National Recording Holding 86 Ram 100 with a Q jet. __________________ John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 10-09-2020 at 08:58 PM.

10-09-2020, 05:49 PM	#3
Jeff Stout VIP Member Join Date: Dec 2001 Location: phoenix Posts: 1,489 Likes: 66 Liked 706 Times in 283 Posts	Re: Carb size ? Thanks for the response. Saves my testing that idea.

10-13-2020, 08:51 PM	#9
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,681 Liked 240 Times in 112 Posts	Re: Carb size ? 200? Wow , I was considering myself kinda lucky having 5 virgin Holley boosters. That's after I've ruined 2 already, they M i g h t be saveable. Love that story. Curious, I know the primaries are small, are TQ's very good on fuel mileage? Without getting driveability issues? __________________ Dave Noll, EF/S ,?/SA 6526

10-14-2020, 04:15 PM	#10
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,736 Likes: 2,808 Liked 2,488 Times in 698 Posts	Re: Carb size ? For a carb and not FI they we pretty good on MPG for the 70's. If you got the rear Air Door adjustment dead correct they were pretty fair on drivability. However not so much the 71 first year versions only 340s. They were recalled and replaced with the different metering 72 version for drivability issues= Although I prefer the 71 for the race track if can find them and the unique jets and other stuff. __________________ John Irving 741 Stock 741 Super Stock