hey, anyone thought about using the new gm 383 crank in a lt1/lt4, it uses the stock bore with a 3.800 stroke, p/n 12489436, rods 12497870, pistons 12489437,,

has a 8 inch balancer listed, but could it be re-balanced for our hub and balancer, it uses the same one piece seal and flywheel,

just an idea to make a simple 383, no machine work if you had a low milage lt1/lt4, just clearance the block, hone the cyl's if good and your set, a 383 that could be built in a weekend,

any thoughts?

thanks
jay
camaro1@wctc.net


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94 auto,150 nitrous express kit,
LT4 crate engine with hot cam, extreme duty timing set, 52 mm throttle body, 24 # svo injectors, edlebrock headers, 4" random tech cat,3" flowmaster exhaust, 2400 tci stall, mac sub frame con, ford 9" 31 spline m&e axles, 3.70 gears, full spool, v-6 rear springs with air bags,8 way adjustable kyb shocks and struts and hoosier tires for the track, and engine tuning by me with tuner cat.

11.51 at 119 mph
1.6 60ft.


2nd car: 88 tbi 305 camaro running 1227747 ecm with prom burned by me, lt1 cam, comp cams valve springs, open element air cleaner, 3.42 gears,

 

I looked into this. Problem was those were the only pistons i could find and i need better ones.

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Ellis
Team Captain
Team North West F-Body
www.teamnwfbody.org

 

so your saying if these pistons would be what a person wanted for comp ratio / hp rating, the setup would work

 

Thats interesting.....a ussual 383 is .030 over and a 3.75 stroke....

4.00 stroke and the 3.80 stroke makes it a 382. But with that crank it would put the pin hieght at a .050 diffedrence....

I m guessing thats close enough with a stock deck hieght that would put the piston out of the deck about .025....(.025 deck hieght ussually.....) = .050 total....

With a .039 head gasket that puts the piston about .014 from the head.......so maybe the easy solution is to use a off the shelf 3.75 stroke 383 piston....and have them cut about .015 to .020 and have a great combustion chamber.....

That would make it ...
4.030 bore....(Mine as well) with a 3.80 stroke....= 388...so a couple free cubes too...

 

yuo that was the problem. You either had to have cutom pistons or shave a set. I was looking long term. First I wanted as much deck as I could for N2O. This kind of left me NOT wanting to shave the pistons and put me into custom piston range. anyone priced custom pistons lately

i wound up with a Eagle 4340 non twist forging for $550 to my door. then a set of coated Wiseco pistons for about the same.

The GM setup should be killer for TQ/ let us know how it turns out.

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Ellis
Team Captain
Team North West F-Body
www.teamnwfbody.org

 

why not just go with a plain jane 383 (maybe overbore it .040 to get a 385) or a 3.875" crank with no overbore for 390cid?

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Cheston P - IM_A_0@yahoo.com AIM:Impalaitis
96 BBB Impala SS "ADIOSS"
91 white Caprice 'n0n 9c1' w/L03

GM_TBI listserv
GMForums.com
ImpalaSSForum.com

 

Any ideas on why they choose such an odd stroke?

I mean is the extra .050" of stroke really worth it?

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Jason
93 TA, M6

 

i figure they made it that way just to keep the standard bore and still have a 383, this set up will make a 383 very simple to build,

the crank rods pistons are all based from the new 383 truck crate engine,

i saw an article in one of the magazines and they the took this 383 crate engine and put a different cam in it and did some work to the vortec heads,( i think just machined to work with the cam), and it made like 430 hp, and more than that in torque

i think this setup , will make for a very simple 383 build up, and all the parts cost about $1500 total