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76 trans am 400


i am a chevy man & bought my wife a 76 ta, all originial. the car is auto & has no eng or drivetrain mods. car sat for 8 yr. i pulled plugs & wet the cyl. hand cranked about 20 times. installed the plugs, fresh fuel & started engine. drove around the lot. eng sounds good. i will pull eng soon & tear down for rebuild. want to have 350 to 400hp when done but i don't even know where to start for the right parts. trans will be gone thru & beefed up as well as rear gear change. i need lots of direction, can you help?? thanks in advance for any consistant & pertinent info. don

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deanzadon


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First I would Like to welcome you here it's good to have you and your Hot Rod here with us . Great Car to own 1976 Trans Am . That factory Engine can indeed be brought up to Around 375 H.P . It should have 4X or 6X Heads on it . So you can run them with a Good Valve Jobs done to them and some Mild Port Matching . Zero Deck the Block and go .030" over bore and some Forged Flat Top Pistons have the Cast Rods resized on the Large Ends with ARP Bolts installed for the Oil Pump run the Ram Air IV 60 PSI remake with the Hardened Pump Shaft . Intake I think with your Shaker Hood the Best bet for Fit and Performance would be a 1968-72 400-455 Cast Iron Stock intake with a Q-Jet of that same Time Frame . Your HEI can be shimmed and Curved with a Performance Module and High Volt Coil and Wires installed . I would also run Headers with 2 1/2" Pipes . For the Camshaft I will do some New Camshaft Spec checks and come up with a Good one . I had a 1977 T/A that was built kind of Like this that had the Old GTO Ram Air III 068 Camshaft . It ran well But was under Cammed . You will want a 2500 Stall Speed converter and 3.55 3.73 Rear Gear . Now you might have a 3.23 Stock . Also your TH-350 will need a good Rebuild and will be Tested by the Torque of that 400 Pontiac . See Pontiac went with the TH-350 1975 and Never because of the Lack of Floor board Room with the Cat converter Exhaust system . My 1977 T/A had a TH-400 out a Cadillac with 2400 B&M Converter with 3.23 Posi . It had Tall back Tires and Really would have Launched better with a 3.55 or 3.73 . But It did pull hard and ran Nose to Nose with them LS1 Late 90's Ram Air Trans Am's and Knocked out them Gen-2 LT-1 Impala's . Also I do what I can to Lighten them up and always have installed Frame Connectors on any F-Body car's .



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This is too cool!!! You save me sooo much time, frustration & mistakes!!! So glad I found you. I forgot to mention that this car will be daily driver(when we don't have all this snow on the ground) & it will have AC. Does that still work with what you've said so far. Also, please keep that in mind when considring the cam. Will that give me a 155 to 165 comp ratio? I will need to run it on good pump juice. This is likly to be a year long process as the car needs complete inside redo & super good paint, so no hurries on this end. thanks for your time!!! dd

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deanzadon


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With the zero deck and Flat tops with 6X Head's it should be just slightly over 9.1 C/R . I was thinking you might be running A/C and all your accessories . Pontiac's Like larger duration and shorter Lift Cams I will Look one up and do some P.C dyno checks on it . Also I would say run Poly Lock Rocker Nuts so you will have adjust-ability of the Valves this is important after decking and or milling Heads and will for sure add to the Performance of this Engine .

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