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Old 10-28-2020, 05:51 PM
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Half-Inch Stud Half-Inch Stud is offline
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11" converter might be fine. Sure your got 1st on pull-away!p?

Electric pusher pump and Q-JET and i think your in the high 12s.
+0.1 sec per 100 Lb, so 12.8 ET would be SMOKING.
See signature for compares

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Old 10-28-2020, 07:12 PM
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What part of the country are you in? Do you run at higher elevations?

It seems like you’re down on power a little. Should be able to turn over 100mph with that combo. Before you spend money you might not have to, make sure you have full throttle. Also get softer springs for the vacuum pod on the Holley 750 and see if opening the secondaries sooner helps. And check fuel delivery like mentioned above.

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68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
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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Old 10-28-2020, 09:05 PM
74GP455 74GP455 is offline
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What part of the country are you in? Do you run at higher elevations?

It seems like you’re down on power a little. Should be able to turn over 100mph with that combo. Before you spend money you might not have to, make sure you have full throttle. Also get softer springs for the vacuum pod on the Holley 750 and see if opening the secondaries sooner helps. And check fuel delivery like mentioned above.
I’m in NY, on long island. Tracks are in NJ.

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Old 10-28-2020, 09:10 PM
74GP455 74GP455 is offline
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Originally Posted by Half-Inch Stud View Post
11" converter might be fine. Sure your got 1st on pull-away!p?

Electric pusher pump and Q-JET and i think your in the high 12s.
+0.1 sec per 100 Lb, so 12.8 ET would be SMOKING.
See signature for compares
Def in first, I manual shift it. Been thinking about going to q-jet for a while. And an RPM intake too.

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Old 10-30-2020, 07:53 PM
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Call Cliff.

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Old 10-30-2020, 09:33 PM
74GP455 74GP455 is offline
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Call Cliff.
I actually tried to send him some kind of link through this forum to have him take a look at my post but couldn’t seem to figure it out. I’ll try to google a number for him. Thank you

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Old 10-30-2020, 11:33 PM
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I actually tried to send him some kind of link through this forum to have him take a look at my post but couldn’t seem to figure it out. I’ll try to google a number for him. Thank you
www.cliffshighperformance.com 1-740-397-2921 Cliff answers the phone!

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Old 10-31-2020, 12:14 AM
74GP455 74GP455 is offline
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www.cliffshighperformance.com 1-740-397-2921 Cliff answers the phone!
Thank you!

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Old 10-30-2020, 08:49 PM
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72LuxuryLeMansLa. 72LuxuryLeMansLa. is offline
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Def in first, I manual shift it. Been thinking about going to q-jet for a while. And an RPM intake too.

I'm no expert, but I start here...

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