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Author Topic: 7028362 or 17057274  (Read 3095 times)

Offline knucklehead12

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7028362 or 17057274
« on: August 08, 2015, 02:50:15 PM »
I am rebuilding the original 400 in my 1968 GTO convertible and am trying to decide what to do with the carb. The car is a manual transmission.  I have a friend who gave me an 800 cfm Quadrajet 17057274 which is for an automatic 1977 LeMans. I am going to stroke the 400 to a 461 and figured I would need the 800 cfm.  Which carb would be best, the original or the other?
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Offline knucklehead12

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Re: 7028362 or 17057274
« Reply #1 on: August 08, 2015, 05:16:28 PM »
Or third option, keep looking for a manual trans carb that is 800 cfm?
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Offline Ethan1

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Re: 7028362 or 17057274
« Reply #2 on: August 08, 2015, 05:55:51 PM »
 I would go with the 17057274.
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Ethan

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Offline Frank400

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Re: 7028362 or 17057274
« Reply #3 on: August 08, 2015, 05:59:25 PM »
So would I.  One of the best ones, isn't that the one Cliff uses on his own car ?  I'm pretty sure it has the POE under the secondary air door instead of over, which is another plus.
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Offline knucklehead12

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Re: 7028362 or 17057274
« Reply #4 on: August 09, 2015, 04:42:44 AM »
Does it make any difference that it is for an automatic and I have a manual trans?  I assume I can change the linkage to get rid of the kickdown forthe auto trans. Besides that and figuring out the appropriate rod jet combo, is there anything else that would need to be done?
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Offline Ethan1

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Re: 7028362 or 17057274
« Reply #5 on: August 09, 2015, 05:58:37 PM »
Quote from: Frank400 on August 08, 2015, 05:59:25 PM
So would I.  One of the best ones, isn't that the one Cliff uses on his own car ?  I'm pretty sure it has the POE under the secondary air door instead of over, which is another plus.

 Yep, it sure is!
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Ethan

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Offline qjetsrule

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Re: 7028362 or 17057274
« Reply #6 on: August 12, 2015, 09:51:05 PM »
After watching what a prepped stock carb can do on this 68 firebird, you might want to go with the original carb. Check out this youtube video of a 68 firebird.

https://www.youtube.com/watch?v=nyyRoaeujiA
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Offline Frank400

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Re: 7028362 or 17057274
« Reply #7 on: August 13, 2015, 06:15:57 PM »
Quote from: qjetsrule on August 12, 2015, 09:51:05 PM
After watching what a prepped stock carb can do on this 68 firebird, you might want to go with the original carb. Check out this youtube video of a 68 firebird.

https://www.youtube.com/watch?v=nyyRoaeujiA

   Those guys in NHRA stock eliminator run the original carbs because they have no choice, that's what the rules are.  I'm not saying they're not doing a great job because they are, but if they could, I'm sure they would use a later model casting because they are better.
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Offline von

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Re: 7028362 or 17057274
« Reply #8 on: August 14, 2015, 02:34:35 AM »
Actually per NHRA rules they can use any Q jet as long as the venturi size (750 or 800 cfm) matches original.
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