4.3L Performance on a budget
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4.3L Performance on a budget - 4/28/2008 1:29:56 PM
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Brian Mooney
Posts: 3
Joined: 4/28/2008
Status: offline
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Hello, I was looking at the 350 conversion, and am kind of interested in it, but not the way gas prices are going. I've got an 02' Blazer LS. I'm wanting to upgrade the motor a bit, maybe put some cams in it and/or intake manifold, bore the throttle body possibly, is there anyone that knows anything about this? Can i even buy some mild cams or an intake manifold?
My car has 64,000 miles on it, and is slower than dog  poop. I was even thinking about buying my friends Nitrous kit for $125.
Would this be a solution, how much can you necessarily spray on these motors safely?
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RE: 4.3L Performance on a budget - 4/28/2008 7:12:32 PM
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swartlkk
Posts: 13748
Joined: 5/1/2005
From: Waterloo, NY
Status: online
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Welcome. I will suggest that you browse through the forum for a bit and maybe try some searches to see what others have tried. The topic of nitrous on these motors has been covered fairly well by 02Vortech. Cams have been covered most recently in a few threads, but the cost might be a bit prohibitive...
Let us know if you still have some questions after reading through a few threads and please try to link to those threads that you have read so we don't duplicate previously suggestions.
Good luck and keep us posted.
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Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: 4.3L Performance on a budget - 5/1/2008 9:23:25 PM
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95LS
Posts: 150
Joined: 3/23/2008
Status: offline
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my advice would be to start with the small stuff. headers,exhaust,throttle body,cai, and then work on the bigger things (cam,heads.....) that is if you dont want to do a engine swap. i think youll be better off in the long run that way.
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found out i have a LT ( couldn''t remember if it was LS or LT when i made this )
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RE: 4.3L Performance on a budget - 5/5/2008 2:53:14 PM
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SmokeU
Posts: 246
Joined: 11/7/2007
Status: online
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i would go with the engine swap
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RE: 4.3L Performance on a budget - 5/22/2008 12:01:04 PM
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The A Team
Posts: 136
Joined: 5/22/2008
Status: offline
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quote:
ORIGINAL: SmokeU
i would go with the engine swap
x2 i think i have done pretty much every bolt on with mine and i have NOT noticed any power improvements. Millage i think went up about 2-3 mpg though  to a remarkable 19 mpg. 
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RE: 4.3L Performance on a budget - 8/14/2008 5:52:02 PM
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97ssblazer
Posts: 78
Joined: 8/12/2008
Status: offline
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i have done alot too.. cant seem to get mch more out of mine either... try a hypertech tuner, k&n intake and exhaust... thats what i did and i beat stock blazers...
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RE: 4.3L Performance on a budget - 8/15/2008 12:09:52 PM
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Duntov
Posts: 163
Joined: 2/29/2008
Status: online
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Unfortunately, the 4.3L TBI was at optimum power output when it came off the factory assembly line. Very little, if any, power improvements can be made with buget aftermarket modifications. The 4.3L TBI engine needs all the low end torque it can muster and if a hotter cam is installed such as a GM marine cam or a aftermarket cam with higher valve lift and longer valve duration, you will only succeed in killing what little low end torque the 4.3L engine possesses.
The improvements you can make to the 4.3L engine is for durability by using the following parts:
Ross #90459 +.030" OS, 350 Chevy V8 forged aluminum pistons with .0035" skirt clearance; Cloyes 9-3100C timing set; GM-12363753 2.02" x 4.880" intake valves; Melling #10555 oil pump; .750" ID Melling #259S or Sealed Power #224-14263 4WD pick up screen assy.; Melling IS-55E steel oil pump drive shaft; Comp Cams #7940 High-Tech 5/16" x 7.200" chromemoly pushrods; Crane 270-99148-2 rocker studs with 3/8"-24 top x M10-1.5" bottom threads which will replace stock screw-in rocker studs or install V8 GM-12495497 rocker studs, 3/8"-24 top x 7/16"-14 bottom threads which will machining to replace OEM pressed-in rocker studs; GM-3927142 valve springs with 110 lb. @ 1.700" seat pressure; GM-14011051 guideplates; Eagle H-beam CRS570063D, 5.700" steel 4.3L V6 or resized OEM 5.700" 4.3L V6 rods with SB Chevy ARP bolts and you must totally internally balance the engine. For more horsepower and torque use nitrous oxide or install a turbocharger.
The power limitations of the 4.3L V6 is why GM installed turborchargers on the 1991 Syclone and 1992 Typhoon engines and did little else.
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1991 S10 Blazer 4-dr, auto., 4x4, 4.3L TBI
Competely original. My Blazer even has 1991 air in the spare.
Restored 1963 Pontiac Catalina Sport Coupe, Richmond ST-10 4-speed, 421 H.O., 370 HP tri-power, 3.64:1 Saf-T-Track, HD Police Option
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