#181  
Old 06-19-2019, 10:25 PM
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Stuart Stuart is offline
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Looks great!
  #182  
Old 06-20-2019, 02:35 PM
SD455DJ SD455DJ is offline
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Default Dyno Day Results

Well, the big 428 (actually 434 with a .035" overbore) did pretty well and leveled out at 432 hp at 5000 rpm and 502 lbft torque at 3700 rpm through the regular A-body/2nd Gen F-body RA manifolds with 2.25" outlets. Knowing the long branch factory manifolds (2.5" outlets) makes a few more hp & tq across the rpm range would put the hp to 435 and tq to 505. Dan is very satisfied with the results and called it a day after a dozen pulls. The motor never missed a beat and ended up liking 38-40 degrees total timing and the jetting he started out the day with (I'll have find out what that was). It lost power when they tried richer and leaner mixtures. The motor has 10.75 (+) actual compression and an 068 cam with 1.5 stamped rocker arms. Most runs showed the power peaking at 4800 rpm and hanging on at 490 hp (+) until 5300 rpm before dropping off. 428's are very impressive motors to say the least!

Dennis
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  #183  
Old 06-20-2019, 03:01 PM
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Okay, so first of all I stand super corrected and super impressed! I was 30HP short on my call. What heads are you using? So this would have been a 390 horse motor? I'm sure the bore and careful blueprinting of the motor made somewhat of a difference. But still, this is darn impressive. That big B-body is gonna hustle!
  #184  
Old 06-20-2019, 04:01 PM
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Paint is looking great and impressive dyno numbers!
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69 GTO 467, 850 Holley, T2, Edelbrock Dport 310cfm w Ram Air manifolds, HFT 245/251D .561/.594L, T400, 9" w 3.50s 3930lbs 12.10 @ 111, 1.76 60' still tweaking

The spare/old combo: 400 w 16 Heads, 750 Holley, T2, Comp HR 236/242D, 520/540L, RA manifolds, T400 w 3500 stall, 9" w 3.50, 3950 lbs, best of 12.93 @ 104
  #185  
Old 06-20-2019, 04:12 PM
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Oops, I see that I said 490 hp(!), I meant to say 430 hp from 4800 to 5300 rpm. The torque curve was super flat as well with 465 lbft.(+) torque from 3000 rpm to 4700 rpm!

Proximity_alrt - the heads are stock unported #16 big valve heads and ,yes, it is the 390 hp HO with the 068 cam being a 4-speed (M-21) 4.11 rear end Cat. The motor is a careful rebuild, but not an NHRA blueprinted effort by any means. It's meant to enjoy on the street, but turn respectable times at the Pure Stock Drags. It is not an "all-out" motor.

Dennis
  #186  
Old 06-20-2019, 04:14 PM
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Here's a clip form the Dyno display...

Dennis
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  #187  
Old 06-20-2019, 08:43 PM
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What do you plan to do with fuel? 10.75 actual compression and the relatively mild duration 068 cam sounds like 100plus octane needed.
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  #188  
Old 06-21-2019, 06:30 AM
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North - Dan ran 110 for the dyno runs and plans to blend fuels for the little time the car will be driven on the street. He has access to 110 just down the road. The Cat's main duty is for the Pure Stock Drags meeting the "advertised" specs for the motor. We're hoping for high 12's at 108 mph thinking it will weigh somewhere around 4000 - 4100 lbs. with driver and full tank of gas.

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  #189  
Old 06-28-2019, 07:21 AM
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Here's a few pictures of the post dyno 428HO with its proper long branch manifolds and the body post paint booth.

Dennis
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  #190  
Old 06-28-2019, 01:39 PM
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It's going to be a stunner.
  #191  
Old 06-28-2019, 02:52 PM
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I'm just going to put this out there: this is awesome and I'm super jealous. It's going to be gorgeous done and one fun ride.
  #192  
Old 06-28-2019, 08:19 PM
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Seen it last weekend.She's Green!
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  #193  
Old 07-03-2019, 10:55 PM
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Wet sanding now...getting a little closer!

Dennis
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  #194  
Old 07-16-2019, 12:51 PM
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Paint has been wet sanded and buffed, the interior painted black around the windows, and trunk spatter painted. Next is the door and quarter guts and glass installation while the front clip gets the treatment.

Dennis
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  #195  
Old 07-16-2019, 05:37 PM
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It's funny - I never cared much for Verdero Green back when these cars were new, but I like it quite a lot today. That thing sure looks nice.
  #196  
Old 07-17-2019, 06:57 AM
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Thanks Stuart! And the recognition goes to Scott Tiemann and his staff (Dan, Tim & Randy). They do awesome work!

Dennis
  #197  
Old Yesterday, 07:27 PM
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Dan's been busy installing the quarter glass, window mechanisms, taillights and PONTIAC letters on the tail panel.

Dennis
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