Need some help with 350 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Alderson95 · 06-10-2011, 07:46 PM

I have a 96 chevy z71 with a 350 vortec. I was woundering can i put a 383 crank in the truck as a direct replacement of the 350 crank. I will have the 383 crankshaft balanced and what not just wounderin if it would work.
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92GMCDriver · 06-10-2011, 07:55 PM

I dont think it would work. you have to get the blocks machined to fit the bigger crank because of the longer stroke. if not the counterweights will hit the block.

Alderson95 · 06-10-2011, 08:01 PM

Ok thanx can i put a bigger cam in the truck without messin up the computer.
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benoit454 · 06-10-2011, 09:57 PM

nope, and nope.

it's not a 383 crank, it's a 400 crank and in order to be 383 it has to be bored to .030 oversized.

any cam pretty much bigger then stock is gonna require a tune.

sean1969c10 · 06-12-2011, 10:27 AM

Scat and Eagle both make 3.75 stroke crankshafts with a 1pc rear main seal and 350 mains. You would need to change the pistons and clearance the block, the rod bolts end up hitting the pan rail and the bottom of the cylinders on the cam side. The counterweights are not a problem. My guess is if you kept everything else stock the truck would run alright and the computer would learn up and compensate for the larger fuel demand. Good luck!!

92GMCDriver · 06-12-2011, 02:15 PM

sean 1969c10 hit it right on the head. i wasnt quite sure if it was the counterweights or the connecting rods that need more clearance. and as for a cam what do you have in mind? something very mild would probably work, but these motors are pretty fussy when it comes to little changes. id recommend going to tbichips.com ive heard nothing but good from them and they have tons of information on their site about what cam, heads etc...

06-10-2011, 07:46 PM	#1
Alderson95 Registered User Join Date: Oct 2010 Location: Whitney Posts: 152	Need some help with 350 I have a 96 chevy z71 with a 350 vortec. I was woundering can i put a 383 crank in the truck as a direct replacement of the 350 crank. I will have the 383 crankshaft balanced and what not just wounderin if it would work. Posted via Mobile Device

06-10-2011, 07:55 PM	#2
92GMCDriver Registered User Join Date: Oct 2010 Location: Lethbridge, Alberta Posts: 124	Re: Need some help with 350 I dont think it would work. you have to get the blocks machined to fit the bigger crank because of the longer stroke. if not the counterweights will hit the block.

06-10-2011, 08:01 PM	#3
Alderson95 Registered User Join Date: Oct 2010 Location: Whitney Posts: 152	Re: Need some help with 350 Ok thanx can i put a bigger cam in the truck without messin up the computer. Posted via Mobile Device

06-10-2011, 09:57 PM	#4
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: Need some help with 350 nope, and nope. it's not a 383 crank, it's a 400 crank and in order to be 383 it has to be bored to .030 oversized. any cam pretty much bigger then stock is gonna require a tune. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

06-12-2011, 10:27 AM	#5
sean1969c10 Registered User Join Date: Mar 2008 Location: Powhatan, Va. Posts: 377	Re: Need some help with 350 Scat and Eagle both make 3.75 stroke crankshafts with a 1pc rear main seal and 350 mains. You would need to change the pistons and clearance the block, the rod bolts end up hitting the pan rail and the bottom of the cylinders on the cam side. The counterweights are not a problem. My guess is if you kept everything else stock the truck would run alright and the computer would learn up and compensate for the larger fuel demand. Good luck!! __________________ Sean "If your gonna be dumb, you gotta be tough" 1960 Chevy Impala Sedan - my 25 year search is over!! 1969 C-10 longbed - Nice day DD 1970 Chevy Nova - Street and Strip Project 2002 Acura MDX my DD 2007 Honda Odssey - My Wife's "Mommy Van"

06-12-2011, 02:15 PM	#6
92GMCDriver Registered User Join Date: Oct 2010 Location: Lethbridge, Alberta Posts: 124	Re: Need some help with 350 sean 1969c10 hit it right on the head. i wasnt quite sure if it was the counterweights or the connecting rods that need more clearance. and as for a cam what do you have in mind? something very mild would probably work, but these motors are pretty fussy when it comes to little changes. id recommend going to tbichips.com ive heard nothing but good from them and they have tons of information on their site about what cam, heads etc...



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