Any 4.3 v6 swaps? - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ericjon262 · 08-24-2014, 01:08 PM

I've been looking at a slightly different route myself, I'm going to run a 4.2 Inline 6 from a trailblazer in my '70 GMC.

brad_man_72 · 08-24-2014, 02:35 PM

Vortec 4.3v6 is a great engine if the 5.3 didn't get the same mileage and have100 more hp and just about the same ammount of modifications it would be a good choice for a swap. I honestly can't see how they could sell both engines in the same truck from the factory.

I had a 96 sonoma with a 4.3 that got about 16mpg, my 67 with a 5.3 gets about 17mpg pulling my boat.

Sammy · 08-25-2014, 08:03 AM

I considered using a 4.3 in my project truck. (It now sits in the corner of my garage taking up space.) Manifold clearance issues n the wire chasing nightmare changed my mind. Sm block towers for mounts appeared to work. The rear side of the block looks to be identical to a V8 also. I can't see using anything but a OD tranny or 6 speed manual behind it. On a good day my 97 blazer could manage 20 MPG if your foot wasn't too heavy. So dunno if there would be much savings in MPG in the swap and worth all the headaches maybe better off just doing a LS1 swap more desirable in the long run and becoming more common now days.

08-24-2014, 01:08 PM	#26
ericjon262 Registered User Join Date: Mar 2007 Location: Displaced Floridian/Bremerton, Wa Posts: 281	Re: Any 4.3 v6 swaps? I've been looking at a slightly different route myself, I'm going to run a 4.2 Inline 6 from a trailblazer in my '70 GMC. __________________ '06 2500 HD 4x4. manual transfer case, crank windows. '88 V10 Suburban 4x4,"The Pig Rig" L05, 700r4, NP208, 4x4 beater camper fun truck project. My trucks don't leak oil, they mark their territory.

08-24-2014, 02:35 PM	#27
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: Any 4.3 v6 swaps? Vortec 4.3v6 is a great engine if the 5.3 didn't get the same mileage and have100 more hp and just about the same ammount of modifications it would be a good choice for a swap. I honestly can't see how they could sell both engines in the same truck from the factory. I had a 96 sonoma with a 4.3 that got about 16mpg, my 67 with a 5.3 gets about 17mpg pulling my boat. __________________ 67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project,

08-25-2014, 08:03 AM	#28
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Re: Any 4.3 v6 swaps? I considered using a 4.3 in my project truck. (It now sits in the corner of my garage taking up space.) Manifold clearance issues n the wire chasing nightmare changed my mind. Sm block towers for mounts appeared to work. The rear side of the block looks to be identical to a V8 also. I can't see using anything but a OD tranny or 6 speed manual behind it. On a good day my 97 blazer could manage 20 MPG if your foot wasn't too heavy. So dunno if there would be much savings in MPG in the swap and worth all the headaches maybe better off just doing a LS1 swap more desirable in the long run and becoming more common now days. __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

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