new motor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Dobok · 12-01-2012, 12:19 PM

Since I need to build a new motor and I have a 4 bolt main 350 block what is the consensus for the size I should build and why !!! It is going in a 91 chevy silverado(reg. cab)that is going to be lowered and attaches to a 700r4 tranny with a posi 3.42 gear rear. Well fellas--What do you think !!!!

BarryB · 12-01-2012, 01:40 PM

Well this is a broad question. What are your real intentions for the truck. a DD, a toy a dd with some towing ability? For a DD I would probably go with a mild built 350. for efficiency and dependability.dd with nice towing ability, a mild cammed 350 or even 383 for the torque added for making towing easier. toy, stroked cammed up 383 because they have plenty torque for smokin the tires.

LynnJr · 12-02-2012, 06:38 PM

Dubok
Torque is king in any truck so if you already have all the parts a 350 would make good sense.
That said if your crank needs grinding go 383 and never look back.You can get a new crank for pennies more than grinding your original crank and You can feel the difference very easily in the seat of your pants.
I have a 90 GMC K1500 and put a 400 smallblock in it out of a station wagon while my engine was at the machine shop being rebuilt.
The old 98,000 mile 400 was a much better motor than my brand new 350.
If you are running the factory TBI you can't put much of a cam in your 350 at all so cubic inches are your best most reliable friend.
Lynn

12-01-2012, 12:19 PM	#1
Dobok Registered User Join Date: Oct 2011 Location: St.Andrews,Manitoba, Canada Posts: 276	new motor Since I need to build a new motor and I have a 4 bolt main 350 block what is the consensus for the size I should build and why !!! It is going in a 91 chevy silverado(reg. cab)that is going to be lowered and attaches to a 700r4 tranny with a posi 3.42 gear rear. Well fellas--What do you think !!!!

12-01-2012, 01:40 PM	#2
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: new motor Well this is a broad question. What are your real intentions for the truck. a DD, a toy a dd with some towing ability? For a DD I would probably go with a mild built 350. for efficiency and dependability.dd with nice towing ability, a mild cammed 350 or even 383 for the torque added for making towing easier. toy, stroked cammed up 383 because they have plenty torque for smokin the tires. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

12-02-2012, 06:38 PM	#3
LynnJr Registered User Join Date: Nov 2012 Location: santa rosa,california Posts: 650	Re: new motor Dubok Torque is king in any truck so if you already have all the parts a 350 would make good sense. That said if your crank needs grinding go 383 and never look back.You can get a new crank for pennies more than grinding your original crank and You can feel the difference very easily in the seat of your pants. I have a 90 GMC K1500 and put a 400 smallblock in it out of a station wagon while my engine was at the machine shop being rebuilt. The old 98,000 mile 400 was a much better motor than my brand new 350. If you are running the factory TBI you can't put much of a cam in your 350 at all so cubic inches are your best most reliable friend. Lynn



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.