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4.3 head swap

  #1  
Old 01-08-2013, 06:25 PM
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Default 4.3 head swap

Hey guys, I have a '93 1500 with the 4.3, my buddy suggested swapping the heads for the vortec heads to pump some more ponies into my motor.

Questions I have are; direct bolt on? and do the headers line up as well.

Anyone know anything about this?
 
  #2  
Old 01-08-2013, 09:31 PM
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I'm not sure about the 4.3L but I did it to the 5.7L and had to change out the intake (Obviously)
 
  #3  
Old 01-08-2013, 11:29 PM
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You will have to change the intake, but I think the manifolds are the same for the exhaust.
 
  #4  
Old 01-09-2013, 08:42 AM
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In the glove box of your 96 Chev.
You have a RPO build code list

Check and see if you have any of these RPO codes
RPO Name Displacement V6
LB4 4300 4,300 cc (4.3 L; 260 cu in)
L35 4300 4,300 cc (4.3 L; 260 cu in)
[8] LF6 4300 4,300 cc (4.3 L; 260 cu in)
LU3 4300 4,300 cc (4.3 L; 260 cu in)
[9] LG3 4300 4,300 cc (4.3 L; 260 cu in)
 

Last edited by In2Trux; 01-09-2013 at 08:44 AM.
  #5  
Old 01-09-2013, 08:50 AM
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Here is some Wiki history on your 4.3L engine that might change your mind on your possible mod, depending on which 4.3 you have.

V6

4300

Main article: Chevrolet 90-Degree V6 engine
The Vortec 4300 is a 90 V6 truck engine, replacing the Chevrolet 250 in light trucks and 200 cu in (3.3 L) and 229 cu in (3.75 L) 90-degree V6s in passenger cars. The 4300 is based on the 350 cu in (5.7 L) Chevrolet small-block V8, and first appeared in 1985 with the throttle-body injected LB4 in passenger cars; light trucks and vans used Quadrajet carburetors for 1985. In 1991, the limited-edition GMC Syclone featured a 280 hp (210 kW) and 350 lbft (475 Nm) turbocharged and intercooled LB4 with the first use of multi-point fuel injection on a Vortec V6. The central-port injected L35 (Vin 'W') debuted in 1992; the cylinder block was slightly changed, a balance shaft was added to remove minor vibrations, and better breathing yielded 200 hp (149 kW) . Another CPI engine, the LF6, joined in 1996 with the introduction of Vortec cylinder heads, while the LB4 was retired after 1998. In 2002, GM introduced a new multi-point injected LU3 engine, and a LG3 variant appeared soon after. This engine's origins date back to 1955, when the original Chevy small-block V-8 was introduced.
All Vortec 4300s use a cast iron block and heads with a 4 in (101.60 mm) bore and 3.48 in (88.39 mm) stroke, both of which are the same as a 350, which gives them a displacement of 262.39 cubic inches (4,299.8 cc). Connecting rods still measure 5.7 in (144.78 mm) although the rod journal diameter is 2.25 in (57.15 mm). 1992 and later cylinder blocks used a different timing cover since these engines used a balance shaft (some 1992 production cylinder blocks for the LB4 with TBI induction used the 'traditional' front timing chain cover from the small block Chevrolet). This change created a situation where most aftermarket timing chain alternatives do not fit. This is true of gear drives and double roller chains. They are pushrod (center camshaft) engines with two valves per cylinder and are produced in Tonawanda, New York and Romulus, Michigan. Power output of the new LU3/LG3 engines is 200 hp (149 kW) to 215 hp (160 kW) and 250 lbft (339 Nm) to 265 lbft (359 Nm).
4300 applications:
LU3 applications:
LB4 applications:
 
  #6  
Old 01-09-2013, 07:13 PM
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Wow! Thanks for all the info guys. Sounds like if I do it at all, it has to be a pre-92 just based on the timing chain config.

I'll post the RPO build code when I get it back at the end of the week from a buddy hauling some stuff. But sounds like maybe more of a hassle than it's worth.

Dang..........just.....need......more.....power!
 
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