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Old 06-08-2025, 01:15 PM
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OCMDGTO OCMDGTO is offline
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Join Date: Sep 2014
Location: Ocean City Md
Posts: 1,348
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Quote:
Originally Posted by Sprocket View Post
I do not think that you will need much cam to run low-mid 13's. You will want as much lift as you can run to take advantage of the round port heads. Not exactly apples to apples, but here is what I used to run in my '70 Grand Prix: 455 +0.030", 4X small chamber heads unported but improved valve job and Ferrea valves, Q-jet, Edelbrock RPM intake, Ultradyne 223/231 .463/.485 110LSA hydraulic flat tappet cam, GTO-style RAIII exhaust manifolds, 2.5" full length, mandrel exhaust with x-pipe, TH400, 13" converter, 3.42 rear. That combo ran consistent 13.00 in 106-degree heat with fuel starvation at the top end. My car is an a/c car, full trim, spare in the trunk, with no lightening done. Times were with 28" MT et-streets.
Sprocket,
What's it run now with all the changes in your signature?

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Chris D
69 GTO Liberty Blue/dark blue
T400, 9" w 3.50s, 3905lbs

461, 850 Holley, T2, KRE 310s, Comp HR 236/242D .572/.594L, RA manifolds, 11.53@114, 1.55/60

The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, Howard HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60'
  #2  
Old 06-08-2025, 09:38 PM
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Sprocket Sprocket is offline
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Join Date: Nov 2006
Location: Fort Worth TX
Posts: 247
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Originally Posted by OCMDGTO View Post
Sprocket,
What's it run now with all the changes in your signature?
Haven't gotten it to the track yet, but it has significantly more power, especially 3500 rpm and beyond. Will report when I do.

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'70 GP Model J
467 Butler ported Edelbrock D-ports
Torker II intake with Holley Sniper 2
CompCams 236/242 hydraulic roller
Tribal Tubes tri-y headers full 3" stainless exhaust
TH400, 3.50 9" CurrieTrac, 245/35-20 Front, 275/35-20 Rear
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