1994 Silverado 5.7 Question (Full Version)

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1994 Silverado 5.7 Question

  

dmacy2007 -> 1994 Silverado 5.7 Question (6/29/2008 6:45:19 PM)

I Just bought this 94 silverado extended cab 5.7 truck and it just doesnt seem to have much power it only has 102k on it and has been very well taken care of. But I used to have a 1998 Silverado Z71 with the 5.7 Vortec in it and that truck had a ton of power and was an animal this 94 seems to lack the power that i used to have. I know the 94 is a throttle body and those suck but is it really that much of a difference???? If anyone knows please let me know I just am curious if there is something wrong with the truck. Like i said the power isnt bad but its nothing compared to the z71 i had. Also if i bought a vortec 5.7 would i be able to just drop it right in and no problems or is this going to be a serious project??? Thanks let me know if anyone has an idea about any of this.

  
87Moose -> RE: 1994 Silverado 5.7 Question (6/30/2008 7:16:06 AM)

try to run some cleaners through the system and see if that helps any.  Also, check the engine itself to see if anything is loose damaged etc.  You never know what might be the problem if there is any.  There is not THAT much of a difference in the two.  I have a 92 350 throttle body that can hold it''s own with my 95 Z71

bad2006z71 -> RE: 1994 Silverado 5.7 Question (6/30/2008 11:04:49 AM)

well the tbi 350''s were around 220 hp and the vortec 350''s were around 250-255hp. so a 30-35hp jump is a noticable difference. the tbi truly will feel less powerful. but they were good for their day.

you might look into what gearing you have. if the 98 had 3.73''s and the 94 has 3.42''s it will make a difference also.

i know my dad''s 03 with 3.73 gears feels a little more responseive off the line and towing than my 06 with 3.42''s. although i have 295hp vs his 285.

hydengr -> RE: 1994 Silverado 5.7 Question (7/1/2008 4:19:39 AM)

The non-Vortec TBI 350''s (pre 1996) were rated at 200 hp (310 ft-lbs torque).  The additional 50 hp from the Vortecs makes a huge difference in performance.  And, like bad2006z71 stated, differences in gearing may add to your performance woes.

Don''t beat-up the throttle body system to much unless you''ve spent a lot of time with carburetors.  The response from a (stock) throttle body compared to a (stock) carburetor setup was night and day, in its day...

At 102,000 miles, a good tune-up (if not already done) would certainly be in order.      

1990Kubota -> RE: 1994 Silverado 5.7 Question (7/1/2008 6:15:35 AM)

I can say that gears, intake, headers, and maintenanced tuneups are what give the 89-1996 C/K more power. That vortec is a strong motor and yeah a swap should be easy, but the other vehicles in that time range are better at pulling. Speed wise and power wise you have to do those upgrades

  

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