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  #31 (permalink)  
Old 07-01-2010, 08:36 AM
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yes i beleive so

in the US the trannys got sold in bulk and in canada they used up the old stock on the T/As but not the camaros. the camaros started coming with 5 spds

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  #32 (permalink)  
Old 07-01-2010, 08:37 AM
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A Muncie set up for a torque tube from the factory would be a find. Thanks for the heads up.
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Old 07-01-2010, 08:51 AM
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Quote:
Originally Posted by 77'Omega
Now a 4.3 i do know, i have mine in my s10 runing low 13's but not constantly on stock intake and heads with a jet programmer and kb 350 flat top pistons zero decked block milled stock heads. but if you want a good 4.3 engine it needs to be 96 and newer,the LF6, produced in 1996 with the introduction of Vortec cylinder heads and a balance shaft that helpt get rid of vibrations which can make it more efficient and reduce the risk of blowing it at higher rpms.but this particulare one was discontinued in 98.All Vortec 4.3s use a cast iron block and heads and 4 in bore and 3.48 in stroke, both of which are the same as a 350, which gives them a displacement of 262.39 cubic inches . Connecting rods still measure 5.7 in although the rod journal diameter is 2.25 in
The Vortec heads used on the balance shaft engines are the best to use but they present problems with the use of a TBI manifold. I certainly did not want to use a balance shaft engine. i could not even find a Cloyes roller timing set or a high lift camshaft for a balance shaft V6 engine.

My 1991 4.3L V6 TBI engine has Speed Pro L2256F-30 forged pistons. The un-cut 1991 V6 heads are the same as the ones used on the Syclone and Typhoon. My heads have 69 CC combustion chambers using Ferrea 2.02"/1.600" SS dish head, unshrouded valves. The compression ratio is 9.7:1 which only permits the use of 93 octane Texaco/Mobil with Techron to prevent detonation and keep the injectors clean. I tried 87 octane but the ESC would not permit it. The old low-tech SP power forged pistons have a compression height of 1.563" which is about .020" closer to the heads than OEM and cast rebulder pistons. The heads were perfectly flat corner to corner so it was unecesary to mill more than a 0.005" clean up. The block was perfect as well. The MSD Pro Billet distributor fit perfect. I replaced the MSD red cap with a NAPA black distributor cap so every thing appears to be OEM to the uneducated eye. The OEM distributor would have probably worked just as well.

Thanks to the Comp Cams 09-412-8 short duration roller cam with 0.500" valve lift and only 39 deg. valve overlap, the engine is still computer compliant and performs as planned using Comp Cams ovate valve springs. However, if I want to get a better ET than 15.00 seconds, I may seek some of your advice on choosing and installing a computer chip, especially if I choose to install those pricey Edelbrock headers and a 454 TBI. I don't know how free flowing exhaust system will effect the O2 and EGR. I have two spare OEM intake manifolds I am sending one to the machine shop next week to see if the throttle bores can be opened to 2.00". That will be necessary in order to acept the 454 TBI without using a funky adapter plate. I have been given some advice that if I install a 454 TBI on The Blazer with a 4L60 transmission, it may turn out to be a re-programming nightmare. I have not secured a good 454 TBI yet so I may not follow through with that idea. I may resist the temptation to follow "More's Law" .... "If some is good - MORE is better".

Last edited by MouseFink; 07-01-2010 at 09:15 AM.
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Old 07-01-2010, 12:04 PM
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with 454 injectors you will wash out the rings and get a programmer that will reprogram the o2 sensors if not available you can get a programmer that omits one but this could have a negative efect on performance,its better to have functioning O2 sensors with a engine code than no sencors at all, plus an engine code doesn't always mean its not working,its just out of the computers factory acceptance spec. Hell advancing your timing can trip a code and engine light.
454 injectors put out way too much fuel. i tried a 454 tbi system on a 327 and all i got was a trashed engine, but you might try a bigger throttle body with say 60# injectors and go frome there but at this point you WILL NEED a programmer ir your computer will be pissed at you. Also look into after market Throttle bodies,if you think your selection on carbs are good on a v8,there are soooo many different throttle bodies ou there and you get to pick your injectors and air flow alowance and on and on and... you get the pic.
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Old 07-01-2010, 12:10 PM
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Quote:
Originally Posted by 77'Omega
with 454 injectors you will wash out the rings.....
......454 injectors put out way too much fuel. i tried a 454 tbi system on a 327 and all i got was a trashed engine,
it ran like crap so i was just going to drive it to town,eat and drive home and by the time i was headed back (KNOCK,KNOCK,KNOCK,SLAM,SLAM,SLAM) and that was all she wrote. I like to experiment but im not trying that again! and i just thought i would fore warn you. and the Throttle body it self isnt that great even if you just wanted to run your injectors on it, none of them give that nice even spread the aftermarket ones are designed to do.

Last edited by 77'Omega; 07-01-2010 at 12:21 PM.
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