Q-jet pic of interest - Chevelle Tech
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post #1 of 18 (permalink) Old Oct 9th, 19, 8:53 PM Thread Starter
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Tom Terrific II
 
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Q-jet pic of interest

I've gotten several questions and requests about the 800 CFM Q lately. Here's a pic
of the difference the 750 and 800 CFM versions of the Q. Personally, I've flowed several Qs and would rate them as 730CFM but that rounds off to 750 and sounds better. In the real world you have to know what you're looking for and have good light to see the difference.
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post #2 of 18 (permalink) Old Oct 10th, 19, 6:07 AM
von
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Re: Q-jet pic of interest

Have you flowed the larger 800 cfm version?

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post #3 of 18 (permalink) Old Oct 10th, 19, 11:23 AM
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Re: Q-jet pic of interest

I have heard the 800 cfm versions were only on Cadillac's and Chevy trucks. Anyone know for sure?

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post #4 of 18 (permalink) Old Oct 10th, 19, 2:30 PM
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Re: Q-jet pic of interest

I believe it was around 1975 that GM went to the larger body with APT and up the size from 750 to 800 cfm. Some of the earlier 800 cfm units were on Pontiac 455 HO's, many of the Buick 430's and 455's. The Chevy trucks held on to the 750 cfm units through 1978 still using the divorced choke. A really good 800 cfm q-jet to get your hands on is carb # 10785212 used on mid to late 1980's HD emissions 454's and motorhomes.
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post #5 of 18 (permalink) Old Oct 10th, 19, 3:18 PM
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Re: Q-jet pic of interest

Quote:
Originally Posted by 1975TypeS-3 View Post
I believe it was around 1975 that GM went to the larger body with APT and up the size from 750 to 800 cfm. Some of the earlier 800 cfm units were on Pontiac 455 HO's, many of the Buick 430's and 455's. The Chevy trucks held on to the 750 cfm units through 1978 still using the divorced choke. A really good 800 cfm q-jet to get your hands on is carb # 10785212 used on mid to late 1980's HD emissions 454's and motorhomes.
What makes it desirable?

And - do you have any pics of your S-3?
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post #6 of 18 (permalink) Old Oct 10th, 19, 3:37 PM
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Re: Q-jet pic of interest

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What makes it desirable?

And - do you have any pics of your S-3?
They were set up from the factory for big block towing applications, and can be upgraded to performance easily. In normal driving they do not get as heavily into the secondaries improving the economy (mpg's) and low end torque.

I do have a couple pic of my S-3, pretty plain jane white



Will soon start a restoration, the body guy I am working with might have time to get to it this winter. In the mean time am deciding what direction to go with it.
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post #7 of 18 (permalink) Old Oct 10th, 19, 3:57 PM
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Thumbs up Re: Q-jet pic of interest

Good info to know - thanks!

Nice car - I've always liked those.

I really like what Justin has done with his, but YMMV.

https://www.chevelles.com/forums/11158444-post23.html

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post #8 of 18 (permalink) Old Oct 10th, 19, 4:19 PM
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Originally Posted by davewho1 View Post
Good info to know - thanks! <img src="https://www.chevelles.com/forums/images/smilies/thumbsup.gif" border="0" alt="" title="Thumbsup" class="inlineimg" />

Nice car - I've always liked those. <img src="https://www.chevelles.com/forums/images/smilies/biggrin.gif" border="0" alt="" title="Big Grin" class="inlineimg" />

I really like what Justin has done with his, but YMMV. <img src="https://www.chevelles.com/forums/images/smilies/wink.gif" border="0" alt="" title="Wink" class="inlineimg" />

https://www.chevelles.com/forums/11158444-post23.html
Thank you, I really appreciate it. The paint it beat and rough because I painted it when I was 17 and really didn’t do a great prep job. I cared more for performance. But, when I got the car when I was 15 it was stock with the exception of a 270h cam, and flowmaster dual exhaust. Had it’s original Quadra jet and everything.
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post #9 of 18 (permalink) Old Oct 10th, 19, 4:51 PM
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Re: Q-jet pic of interest

Very cool Justin!

Tom, I've searched for the big primary bore Chevy carbs for a while years back, and all I ever found was Olds/Buick ones with the inlet snout in front. I thought someone also told me the 800 cfms have 1 or 2 more screws in the top. "13 screw top"... maybe?

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post #10 of 18 (permalink) Old Oct 10th, 19, 5:51 PM
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Re: Q-jet pic of interest

Quote:
Originally Posted by 1975TypeS-3 View Post
They were set up from the factory for big block towing applications, and can be upgraded to performance easily. In normal driving they do not get as heavily into the secondaries improving the economy (mpg's) and low end torque.

I do have a couple pic of my S-3, pretty plain jane white



Will soon start a restoration, the body guy I am working with might have time to get to it this winter. In the mean time am deciding what direction to go with it.
I always liked those Laguna S-3's,very nice !!!
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post #11 of 18 (permalink) Old Oct 10th, 19, 8:27 PM
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Re: Q-jet pic of interest

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Originally Posted by dyno jonn View Post
I have heard the 800 cfm versions were only on Cadillac's and Chevy trucks. Anyone know for sure?
Chevy Trucks sure did, have the 800 Q-jet of a 454 from 1975 in the garage.
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post #12 of 18 (permalink) Old Oct 10th, 19, 8:33 PM
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Re: Q-jet pic of interest

Quote:
Originally Posted by 427L88 View Post
Very cool Justin!

Tom, I've searched for the big primary bore Chevy carbs for a while years back, and all I ever found was Olds/Buick ones with the inlet snout in front. I thought someone also told me the 800 cfms have 1 or 2 more screws in the top. "13 screw top"... maybe?
The bowl vent is at a 45* angle rather than flat
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post #13 of 18 (permalink) Old Oct 10th, 19, 8:38 PM
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Re: Q-jet pic of interest

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Originally Posted by GuysMonteSS View Post
I always liked those Laguna S-3's,very nice !!!
Guy
I have wanted one for years, fond this one two years ago! California car in Michigan, is original right down to all of the pollution equipment. Engine is showing it's age and is in bad need of a rebuild. I will most likely pull the original engine and trans and put in the corner of my shop, I have a 383 ready to be assembled, and a 427 short block already assembled, my son thinks I should do an LS swap!
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post #14 of 18 (permalink) Old Oct 10th, 19, 8:38 PM
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Re: Q-jet pic of interest

Doesn't have to be a 454 I have some 800's from 79 on up. One was off of my 84 truck with a 305. The latest is a 85.

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post #15 of 18 (permalink) Old Oct 10th, 19, 8:47 PM
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Re: Q-jet pic of interest

Quote:
Originally Posted by dyno jonn View Post
I have heard the 800 cfm versions were only on Cadillac's and Chevy trucks. Anyone know for sure?
Chevy Trucks sure did, have the 800 Q-jet of a 454 from 1975 in the garage.
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