Trans am 1/4 mile estimation
Thread Starter
Junior Member
Joined: Jan 2014
Posts: 24
Likes: 0
From: Marine IL
Car: 1987 Pontiac Trans AM
Engine: 357 SBC 400hp / 420tq +100-150 shot
Transmission: 700r4, B&M shift kit, Stall.
Axle/Gears: Posi BW 9 bolt, 3.70 gears.
Trans am 1/4 mile estimation
Hello, just wondering what people think my car will run. I plan to take it to the local track here in st Louis soon but i was just wanting to know what to expect. If anyone else wants to post specifications on this thread for an estimate as well i don't mind!
*400 - 410 hp / 430 - 440 tq. *flywheel.
*700r4 with B&M shift-kit, and 2500 rpm stall. shifts at 5900 to 6100 rpm.
*posi 9 bolt with 3.70 gears.
*car has no ac, no interior, jack, and tire removed, weighs around 3240 lbs.
* full length sub frame connectors.
*lakewood drag shocks.
*aluminum drive shaft, box tubed lower control arms, etc.
Engine modifications listed below in case someone wants them.
engine- 357ci, 10x10 balanced eagle crank, forged aluminum pistons, speed pro rods, gasket matched performer rpm intake, crower slotted "race" lifters, comp pushrods, comp 1.52 roller tip rockers, 4 bolt mains, 1.94 valves, ported 68cc heads, 9.4 to 1 comp., Short tube hedman headers to flowmaster y pipe.
Howard's racing camshaft (street cam) NON ROLLER.
------------Valve lift----degrees of duration------
intake----- .480 ------- 285* -------
exhaust--- .488 ------- 289* -------
Lobe center 108 intake C/L 104
*i know lots of these threads already exist i just didn't want to hijack someone's. any knowledge is appreciated. i'm wanting a bottom 13 high 12 car. from what I've seen it should be possible but i wanted to be sure before got my hopes up!
thanks!
*400 - 410 hp / 430 - 440 tq. *flywheel.
*700r4 with B&M shift-kit, and 2500 rpm stall. shifts at 5900 to 6100 rpm.
*posi 9 bolt with 3.70 gears.
*car has no ac, no interior, jack, and tire removed, weighs around 3240 lbs.
* full length sub frame connectors.
*lakewood drag shocks.
*aluminum drive shaft, box tubed lower control arms, etc.
Engine modifications listed below in case someone wants them.
engine- 357ci, 10x10 balanced eagle crank, forged aluminum pistons, speed pro rods, gasket matched performer rpm intake, crower slotted "race" lifters, comp pushrods, comp 1.52 roller tip rockers, 4 bolt mains, 1.94 valves, ported 68cc heads, 9.4 to 1 comp., Short tube hedman headers to flowmaster y pipe.
Howard's racing camshaft (street cam) NON ROLLER.
------------Valve lift----degrees of duration------
intake----- .480 ------- 285* -------
exhaust--- .488 ------- 289* -------
Lobe center 108 intake C/L 104
*i know lots of these threads already exist i just didn't want to hijack someone's. any knowledge is appreciated. i'm wanting a bottom 13 high 12 car. from what I've seen it should be possible but i wanted to be sure before got my hopes up!
thanks!
Last edited by JordanStoltz87; Jun 8, 2014 at 05:07 PM.
Thread Starter
Junior Member
Joined: Jan 2014
Posts: 24
Likes: 0
From: Marine IL
Car: 1987 Pontiac Trans AM
Engine: 357 SBC 400hp / 420tq +100-150 shot
Transmission: 700r4, B&M shift kit, Stall.
Axle/Gears: Posi BW 9 bolt, 3.70 gears.
Re: Trans am 1/4 mile estimation
Mid 12's would be great, what would a set of radials do to my et? Are they worth it?
Senior Member

Joined: Mar 2007
Posts: 574
Likes: 2
From: Muscatine IA
Car: 91 Firebird Formula
Engine: 383
Transmission: built 700r4
Axle/Gears: 4.11, 9inch
Re: Trans am 1/4 mile estimation
id say high mid to high 12s. that's about the power my old stroker motor put out and I ran countless 13.0's ive got a bit more car then you tho. ways in at a hefty 3450lbs giver or take. I call it 3700 with me in it.
Senior Member

Joined: Mar 2007
Posts: 574
Likes: 2
From: Muscatine IA
Car: 91 Firebird Formula
Engine: 383
Transmission: built 700r4
Axle/Gears: 4.11, 9inch
Re: Trans am 1/4 mile estimation
radials are only goin to matter if your spinning. if you can hook up on street tires there wont be a difference.
Thread Starter
Junior Member
Joined: Jan 2014
Posts: 24
Likes: 0
From: Marine IL
Car: 1987 Pontiac Trans AM
Engine: 357 SBC 400hp / 420tq +100-150 shot
Transmission: 700r4, B&M shift kit, Stall.
Axle/Gears: Posi BW 9 bolt, 3.70 gears.
Re: Trans am 1/4 mile estimation
<p><p>&lt;p&gt;&amp;nbsp;&lt;/p&gt;</p></p>
<p><p>&lt;p&gt;That's what i was hoping to hear. I would be more than happy with anything near high / mid 12s. Especially seeing as I'm probably going to run a 100 shot soon. (not actually a big nitrous guy but I figured I'll try it.) It's a street car so i only plan to build it so much. And i guess I'll hold off on radials until i take it down then. It would suck to buy them and not gain anything!&lt;/p&gt;</p></p>
Thread Starter
Junior Member
Joined: Jan 2014
Posts: 24
Likes: 0
From: Marine IL
Car: 1987 Pontiac Trans AM
Engine: 357 SBC 400hp / 420tq +100-150 shot
Transmission: 700r4, B&M shift kit, Stall.
Axle/Gears: Posi BW 9 bolt, 3.70 gears.
Re: Trans am 1/4 mile estimation
Sorry for any html code im on mobile and im pretty clueless to how it works!
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