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rear end Posted By: hurst On: 04-01-2008 @ 19:05:16 Reply | Edit just bought governor-lock style posi unit and 4.30 gears off ebay for my 88 formula 400 bottom end with tbi top end cant wait to get them and install! goodbye 2.73 single wheel! Posted By: Pocket On: 04-02-2008 @ 00:33:19 Reply | Top | Edit I dont think a 400 crank will fit in your 305... All that ignored, the TBI unit wont be big enough to feed it as it can barely handle the 305 The 4.30 gear ratio is going to KILL your gas mileage and top end power Are you sure any of those mods are a good idea? -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: hurst On: 04-02-2008 @ 18:00:31 Reply | Top | Edit no, the whole bottom end of the motor is a 1974 chevy 400, just the heads and intake and throttle body are off of the original 305, runs fine now, but you can tell that the gears suck, dead out of the hole, dont really care about gas mileage, at most, it is a weekend car, really love drag racing. Posted By: hurst On: 04-02-2008 @ 18:01:43 Reply | Top | Edit i do plan on installing bigger injectors and/or bigger throttle body, and posibbly in future if they are not enough, i will dump the computer and go carburetor Posted By: hurst On: 04-02-2008 @ 18:02:50 Reply | Top | Edit as far as gas mileage, i drive a 3/4 ton silverado hd every day to work! Posted By: roubenbird On: 04-02-2008 @ 21:06:06 Reply | Top | Edit What's the word I'm looking for? Oh yeah, detonation. And I think that you'll need to machine the heads for steam holes. I could easily be wrong though. -- Being rebuilt, It'll take a while: 
WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction,now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73),TPI heads, 1.6 roller rockers 15.543 @ 88.21mph Posted By: Pocket On: 04-03-2008 @ 02:06:38 Reply | Top | Edit You do realise that the 305 TBI swirlports are the WORST heads made by GM? And you put them on a 400 SBC? And THEN you mounted the factory 305 TBI unit ontop of it all? Ill bet your stock old 305 was stronger than this... thing What a mismatch from hell How to fix it: Get better heads Stockers from the 400 atleast, 350TPI heads would be cheap too, maybe vortecs Get better intake Any 4bbl intake will fit and can be matched to any of the above heads Get the TBI adapter plate and you're all set Get better TBI unit For a performance build, go with a holley or Stock TBI off a 454 Get a better engine management system EBL (cheap stock retrofit), Holley, DFI, etc Anything is better than stock Get a real cam On your own here Once you get the motor up to specs you can worry about gear selection Or you can be one of those guys who buys 5 different gear sets because hes always changing stuff and the old set doesnt work well with the new combo again -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: Archangel On: 04-03-2008 @ 08:10:57 Reply | Top | Edit You should get at least a cheap set of 882 or 993 heads. Get a Victor Jr. intake and Holley and your set. Be sure to use a .015" head gasket if you want at least an acceptable CR with the 400 heads. Better yet if you can get them milled. These heads are cheap, and so is the intake/carb setup. Good luck. New flat-tappet cams are dirt cheap. You won't believe the increase in horsepower. --  '91 SuperRammed GTA
"What does matter is that the current GTA carries on the idea of the first Trans Am proudly and deservedly. It's still the most mature and sophisticated ponycar. It still has character. It still has muscle. And it's still worthy of the name." Car Craft, 1991 My mods here: http://www.cardomain.com/id/erpichon Posted By: Pocket On: 04-03-2008 @ 14:52:00 Reply | Top | Edit Match the head chambers to the stock CR of the engine before you start worrying about very minor CR changes from special thickness head gaskets New flat-tappet cams are dirt cheap Thats because they are old technology There is a very good reason 99% of all new internal cams are rollers -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: hurst On: 04-04-2008 @ 19:18:18 Reply | Top | Edit ok thanks but the car is already running anytime i want it to, just run it on the weekends, and it was a hell of an improvement over the 305 bottom end Posted By: hurst On: 04-04-2008 @ 19:19:11 Reply | Top | Edit already put a compu cam in Posted By: hurst On: 04-04-2008 @ 19:20:04 Reply | Top | Edit stock 350 heads i used have better compression than the 400 74 model Posted By: Pocket On: 04-05-2008 @ 02:46:13 Reply | Top | Edit If you say so -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: 91gtaws6 On: 04-16-2008 @ 04:10:47 Reply | Top | Edit I like how he mentions "i do plan on installing bigger injectors and/or bigger throttle body, and posibbly in future if they are not enough, i will dump the computer and go carburetor". I thought that the TBI was the injector and TB in one, or was i mistaken? Why ruin a perfectly good SBC 400 with a TBI intake, I mean atleast keep it close to what GM used go 4 barrel. Posted By: Pocket On: 04-16-2008 @ 12:36:11 Reply | Top | Edit They have larger TB's and injectors for TBI units just like port injected units like your TPI -- "If you have complete control over the damned thing, you're not going fast enough." - Carrol Smith Posted By: hurst On: 04-17-2008 @ 19:39:48 Reply | Top | Edit guess what 91gtaws6 i'm not stuck in the 70's am willing to venture into the realm of fuel injection. i guess you are not Posted By: hurst On: 05-02-2008 @ 19:47:47 Reply | Top | Edit bottom end went out of the 400, now am building a 305 aluminum rods .030 over, dome keith black pistons, if it doesnt run the way i like, it will be my daily driver!
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