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#1
05-20-2023, 07:34 PM
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Chassis dyno numbers
Pulled the original 400 HO engine that was getting a little tired out of my 68 Firebird. In it's place put in a fresh build based on a '73 400 block with a 4.25 Eagle crankshaft, Comp 230/236 roller cam and 1.52 roller rockers. Pistons are Icon with a 30cc dish due to running a pair of stock, date correct 16 heads to keep it looking original along with a '68 intake manifold and RARE long branch exhaust manifolds. Kept the quadrajet but used a 800cfm model. Distributor has a Pertronix III module in it.
Numbers from the Dynojet were: 310 rwhp @ 5350 rpm 346 max torque @ 4450rpm Car was built as a fun street cruiser running on pump gas with 3.36 posi behind a TH200R4. |
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#2
05-20-2023, 11:12 PM
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Those a nice numbers. Should be a lot of fun.
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| The Following User Says Thank You to PAUL K For This Useful Post: | ||
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#3
05-21-2023, 06:23 AM
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Sweet numbers!
If your foot is as uncontrollable as mine you’ll be replacing the rear tires in no time!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
05-21-2023, 10:24 AM
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Did you do any tuning? Optimizing the AFR and timing could be worth another 20-30 hp/tq.
My 455 makes slightly higher numbers, but at lower RPM (less CR, smaller cam, so as expected). I've got a lower restriction exhaust, and a LOT of tuning (EFI & ignition control). My car is a '73 T/A clone, 3.08 gears and stock torque converter - it has ran 13.12 @ 103.2. With your lighter car and more gear, you should easily be in the 12's (with traction!).
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'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust My webpage http://lnlpd.com/home |
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#5
05-21-2023, 10:42 AM
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OP - thanks for sharing. That combo is very similar to my LeMans which has 16 heads and pistons with a 29cc dish. What is the cam lift and LSA?
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
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#6
05-21-2023, 12:08 PM
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Quote:
.573 I .578 E 112 LSA |
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#7
05-21-2023, 12:22 PM
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Quote:
Hope to get it to the track next weekend. Fingers crossed! |
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#8
05-21-2023, 03:37 PM
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Quote:
Looks similar to my old 455, iron headed(96 heads), hyd cam, qjet, RA manifold motor……was a decent street combo… ran somewhere in the 12’s at a 4000lb race weight
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
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