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#1
07-23-2022, 03:28 PM
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https://m.youtube.com/watch?v=Nrgx5LA6TQI
Check out this video Richard Holdener just posted on a 2GC vs 4 barrel dyno test on a stockish 400 that showed a huge gain. His engine has 62 big valve heads and 1-5/8 headers. Cam was unknown but had smooth stock type idle.
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
| The Following User Says Thank You to TCSGTO For This Useful Post: | ||
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#2
07-23-2022, 03:53 PM
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One other advantage to swapping the Q Jet is that the primary side of the carb is more efficient at fuel atomization than the 2 bbl is. The intake manifold is also more efficient as it has more height.
I've swapped plenty of 2 bbl Pontiacs for a 4bbl without a cam change, and they respond to the better intake tract. Yes you'll get more out of the combination with all the attendant other parts, but Pontiac made thousands of cars with 4 bbl intakes, single exhaust and log manifolds over the years. The 3.42 axle is going to drastically alter your fuel mileage, but if you're fine with that reduction, that's fine. It all depends what you want as an end result as to how you modify your car.
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Brad Yost 1973 T/A (SOLD) 2005 GTO 1984 Grand Prix 100% Pontiacs in my driveway!!! What's in your driveway? If you don't take some of the RACETRACK home with you, Ya got cheated    
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#3
07-23-2022, 04:42 PM
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#4
07-23-2022, 05:14 PM
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Quote:
__________________
68 GTO,3860# Stock Original 400/M-20 Muncie,3.55s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
| The Following User Says Thank You to TCSGTO For This Useful Post: | ||
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#5
07-23-2022, 06:35 PM
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Quote:
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#6
07-23-2022, 06:45 PM
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__________________
68 GTO,3860# Stock Original 400/M-20 Muncie,3.55s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
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#7
07-23-2022, 07:24 PM
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Quote:
Sent from my SM-N950U using Tapatalk |
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