SBC torquey tbi build or? - Chevelle Tech
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post #1 of 6 (permalink) Old Dec 21st, 16, 8:48 PM Thread Starter
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Jeff
 
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SBC torquey tbi build or?

Okay, so it's winter and I get these wild hair ideas about giving my old 91 V3500, square body, straight front axle Chevy pickup, a new lease on life with a little more power in the towing department, as I intend to get a tilt deck trailer and haul my 64 Elky to the Vegas strip soon. Truck is rust free and has 125k miles on it. I've driven it long distance ,multiple times, and it has never let me down. It just doesn't have a whole lot of towing pwr being a 5.7 tbi.

Here are some of my options:

1. It's currently a 350 tbi, yeah I know, pretty wimpy in a srw 1 ton 4wd. Should I build a 400 sbc and run the tbi system? I thought about a dart shp block and build a 400 or 421 torque monster? Truck does have a kind of rare combo with 4L80-E and NP205 T.C. The OD makes it nice on the freeway for sure. Will do 80mph with the 4.10 gears no problem, empty.

2. I do have a high mileage,complete but running 91 454 Gen V tbi from a K3500 truck. It would have to be rebuilt, and I would probably just stroke it with a cast 4.25 crank and make a 489/496 torque monster?

3. Find a 12 valve Cummins and do the conversion? Could be pricey, if done correctly?

4. Lastly, and I've been in denial about this one. Sell the truck and step into something more modern, like a 3/4 ton Duramax, Powerstroke or Cummins?

Jeff

64 El Camino Pro street, 496, T-400, 9" 3.73


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post #2 of 6 (permalink) Old Dec 22nd, 16, 8:32 AM
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Re: SBC torquey tbi build or?

Man this is a tough one...
Not sure if there is a right or wrong answer, but since you added a new truck in the mix you have to decide if mpg is an issue or not.
Its set up for a small block, so why not build one?
Well a big block can make more torque...
So do you want to go looking for engine accessories to drop that big block in?
yes, build the big block
no, build the small block
If MPG is an issue, do your want to fight to get the cummins in there?
yes, go for it!!!
no, Go buy a new truck!!!
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post #3 of 6 (permalink) Old Dec 22nd, 16, 9:52 AM
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Re: SBC torquey tbi build or?

SB 400 would do the job pretty good, but I might suggest using TPI intake instead of TBI. TPI will produce more torque, what you need for towing. Otherwise the 454 will tow better than the SB. I did a 92 454 TBI into a 79 Dually, vast improvement over the 350 in it. The 454 did have an Edelbrock TBI intake, headers, Comp Cams TBI camshaft and tuning of the ecu. That engine pulled almost as well as the 8.1L I have in my Suburban. Power fell off around 4500 rpms, but that is common with TBI setups.

Diesel would be the best, but swaps can be quite costly, probably better to buy a newer Diesel truck.
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post #4 of 6 (permalink) Old Dec 22nd, 16, 4:06 PM
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Jim
 
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Re: SBC torquey tbi build or?

Cummins swap would nice, how about a Duramax swap should bolt up to your trans.
Number 4 would be the deal as long as you stay GM.

Jim

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post #5 of 6 (permalink) Old Dec 22nd, 16, 6:42 PM Thread Starter
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Jeff
 
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Re: SBC torquey tbi build or?

Appreciate all the replies. I believe I'm leaning towards #4 and getting something newer. I'd hate to sell my 91 because you never seem to get what they're worth, at least when I'm selling stuff. LoL Might just keep it for a wood/dump truck.

Jeff

64 El Camino Pro street, 496, T-400, 9" 3.73


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post #6 of 6 (permalink) Old Dec 22nd, 16, 7:09 PM
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Allen
 
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Re: SBC torquey tbi build or?

Man that Cummins swap would be cool.

However, maybe a built for low rpm range torque 496 would be the easier/cheaper route to big time towing power.

New trucks are sure nice but there is something very cool about a older well maintained truck still doing the work!

But.... for practicality and to do what you need (a 64 on an open trailer) a 383 (again built for low rpm tq) would do the job and save some bucks........

Dang, did I mention that the Cummins would be cool?
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