4.3 or 305 in a 4x4 from the factory???

Chevy_Finatic79 · 06-24-2008, 07:25 AM

this may be a dumb question but did GM ever use a 4.3L or a 305L in a full size 4x4 truck application.

I know the 4.3 and 305 came in 2WD applications but not sure about using one in a 4x4

Just really wondering if a 305 will hold up to 4x4 demands

z07 · 06-24-2008, 08:49 AM

One of the most successful 4x4 engines ever made was the AMC 4.0 L found in Jeeps. I've seen them pull not only themselves but other 4x4's out of trouble. So if a Jeep can pull itself and a full size out of the mud then I think a 4.3 or 5.3 could certainly take care of itself alone. I never saw a dealer order a full size 4x4 with a 4.3 but a customer could order one. I don't know if it is still true but custom ordering a truck was totally different than a car in that the customer could build any combination he wanted leaving off things like a bed, bumpers etc.

Hayden · 06-24-2008, 12:51 PM

My 94 W/T 1500 4x4 came with a 4.3l but I swapped it for a decently built 350 that i still need to work out the fuel delivery problem. has to be the carb

mudseeker · 06-24-2008, 02:49 PM

my 97 has the 305 in it.

z07 · 06-24-2008, 02:53 PM

Quote:

Originally Posted by Hayden

...I still need to work out the fuel delivery problem. has to be the carb

Was there any concern with using the high pressure fuel pump from the FI 4.3 on the new 350 with a carb?

Hayden · 06-24-2008, 04:25 PM

The fuel pump isn't a high pressure pump. Well for the holley it is but it puts out only 14 psi. (4.3 was TBI not CPI) but when I put a pressure regulator on it and set it for 7 psi it seems like it didnt get enough gas. Idle is inconsistnent and timing jumps around. I'm gonna buy a new carb and dial that in since the holley sat for a few years and dont want to tear it apart. I do have the fuel running from tank pump into the pump on the engine with the return line hooked up and put the regulator close to the carb. I think i'm going to tear the engine apart because the guy who built it wasn't a smart guy. I actually think the cam is off a few degrees

Sneakysportsman · 06-25-2008, 07:24 AM

Log onto Autozone and look up a certian year GM truck and it will tell you what percent was V6 or V8

436'd skylark · 06-25-2008, 05:50 PM

the 305 came in thousands of 1500 and 2500 4x4 trucks..

wojeepster · 06-25-2008, 05:52 PM

I have a fullsize longbed 4x4 1987 4.3 liter throttle body fuel injection. I love my truck. (V10)

06-24-2008, 07:25 AM	#1 (permalink)
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 432	4.3 or 305 in a 4x4 from the factory??? this may be a dumb question but did GM ever use a 4.3L or a 305L in a full size 4x4 truck application. I know the 4.3 and 305 came in 2WD applications but not sure about using one in a 4x4 Just really wondering if a 305 will hold up to 4x4 demands __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 5.7 Liter/THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

06-24-2008, 12:51 PM	#3 (permalink)
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 362	My 94 W/T 1500 4x4 came with a 4.3l but I swapped it for a decently built 350 that i still need to work out the fuel delivery problem. has to be the carb __________________ There Is No Replacement For Displacement

06-24-2008, 02:49 PM	#4 (permalink)
mudseeker Moderator Join Date: Feb 2006 Location: michigan Posts: 3,079	my 97 has the 305 in it. __________________ proud member of the 200k mile club http://s89.photobucket.com/albums/k2...eeker/smilies/ boys never stop playing with toys

06-24-2008, 04:25 PM	#6 (permalink)
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 362	The fuel pump isn't a high pressure pump. Well for the holley it is but it puts out only 14 psi. (4.3 was TBI not CPI) but when I put a pressure regulator on it and set it for 7 psi it seems like it didnt get enough gas. Idle is inconsistnent and timing jumps around. I'm gonna buy a new carb and dial that in since the holley sat for a few years and dont want to tear it apart. I do have the fuel running from tank pump into the pump on the engine with the return line hooked up and put the regulator close to the carb. I think i'm going to tear the engine apart because the guy who built it wasn't a smart guy. I actually think the cam is off a few degrees __________________ There Is No Replacement For Displacement

06-25-2008, 05:50 PM	#8 (permalink)
436'd skylark Senior Member Join Date: Mar 2007 Location: Buffalo Ny Posts: 610	the 305 came in thousands of 1500 and 2500 4x4 trucks.. __________________ Joe 89 K2500 Chevy, Wee-Oh-five 285K miles, completly rebuilt needs a motor, bad 1962 IHC Scout All Wheel Drive (Scout speak for locking axles) 152 ci, dana everything else

06-24-2008, 08:49 AM	#2 (permalink)
z07 Senior Member Join Date: Feb 2008 Posts: 148	One of the most successful 4x4 engines ever made was the AMC 4.0 L found in Jeeps. I've seen them pull not only themselves but other 4x4's out of trouble. So if a Jeep can pull itself and a full size out of the mud then I think a 4.3 or 5.3 could certainly take care of itself alone. I never saw a dealer order a full size 4x4 with a 4.3 but a customer could order one. I don't know if it is still true but custom ordering a truck was totally different than a car in that the customer could build any combination he wanted leaving off things like a bed, bumpers etc.

06-25-2008, 07:24 AM	#7 (permalink)
Sneakysportsman Senior Member Join Date: Jun 2007 Posts: 199	Log onto Autozone and look up a certian year GM truck and it will tell you what percent was V6 or V8

06-25-2008, 05:52 PM	#9 (permalink)
wojeepster Senior Member Join Date: Nov 2005 Posts: 79	I have a fullsize longbed 4x4 1987 4.3 liter throttle body fuel injection. I love my truck. (V10)

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