Fast93Z

iTrader: (1)

hey guys i was wondering what i have to get as far as piston size, rod size, and crank specs to build a 396 stroker.

also i wanted to see if anyone had an idea of how much power i would make with a fully forged 396 stroker fully ported lt4 heads, cc306 cam with 1.6 rockers, and a 250 shot of spray.

also what pistons should i get for the 250 shot i was wondering if the forged speed pro pistons would be good enough and also what pistons would give me the most compression with those heads.

the plan is full suspension Moser 9 inch with 4.10 gears and a mcleod street twin clutch

all help is appreciated i want to get this done by summertime

Stroked96Bowtie

iTrader: (22)

I believe a .030 over piston, 3.875 stroke, and a 6.0in rod will give you a 396ci. I would try to make it work with a shorter rod if you can, Oliver makes a 5.875 rod.

I dont know a whole lot about the cc306, but seems most guys use that cam with stock cubes or something a little bigger. Might want to get a second opinion just to be sure.

For compression, do a search on compression calculator. There are a few really well known ones around. I use the DCR Calculator by Patrick Kelley, it will take all considerations into account. The calculations from this program was dead on from what my machinist uses.

Do you want to keep this setup on pump gas? What are you thinking about using for the intake?

Fast93Z

iTrader: (1)

i would like to keep it on a 100 ll if possible and i plan on using a 93 lt1 intake manifold ported to match the heads, if not then i will get an intake setup like tony shepard or outlawz or something not sure

anyone that can give me some input on how to get the motor done and the rest of the car done as well and what i need to do to make this work i really appreciate it.

SS MPSTR

iTrader: (1)

You need to talk with Larry at LS1 Speed - he just built a 396 that ran high 10's a few days ago. Very impressive, to say the least.

96autoformula

I would personally say to go bigger than the CC306 only because of the fact that on a stroker, cam specs essentially shrink. It sounds dumb, but with the larger displacement a wild cam suited for a stock displacement motor will be much less wild on the larger displacement stroker. And yes, Confuscious say that the guys at LS1 Speed (ie: Speed Inc.) are most helpful.

TDavanzo

iTrader: (3)

^^ Good point. A monster cam on a 350 is going to sound like a burnt plug wire on a 396. Basically it's going to make the cam disappear. Your best bet is going to be to make some phone calls when you have the money and talk to the pros. Guys on the forums can give you good and bad information.

Call someone who does this for a living!!

Fast93Z

iTrader: (1)

but with the cam less noticeable wouldn't it be a good sleeper to rape imports with but im probably going to do a custom grind

1badzee

iTrader: (12)

cc306 on a 396ci - i wouldn't do it..

+1 talk to a professional

LS1 SPEED

iTrader: (22)

if you are serious shoot me an email on your goals and current mods which will allow me to properly spec you a combo

either way the CC306 would be waste going into a build like this


larry@speedinc.com

CamaroRacing12

iTrader: (5)

solid roller? hehe

KFK

iTrader: (9)

Check out my FS post it might be just what you are looking for and could save you a lot of cash.

formulabrandon

why not call loyd elliott or ai theyhave numbers on here they do custom grinds and can tell you exacly what youll need. any reason wy you wont 396 why not just go 383 .030 piston 3.750 stroke an if you go 3.750 or bigger strokego 6 in rod. loger rod takes pressure off cylinder walls and also helps engine rev quicker. and a stock lt1 will rape imports and fox bodies

slomarao

iTrader: (6)

Who is going to be doing the heads? A motor that size is going to need some serious airflow to make good power. If the heads are not done well your not to take advantage of the extra cubes.

As for the cam, talk to Llyod Elliot. He is the one who did the cam for LS1Speeds 396 that just ran 10's the first time out. So i think Llyod knows a thing or two, especially of LT1's of all sizes.

If this car isnt going to be a racecar i wouldnt go SR, unless to dont mind the upkeep. The pistons, the speed pro's will most likey not hold up. Anything over a 200 shot and you really want a n2o piston and ring setup, on a 250 for sure.

At that point your facing many issues, your really going to have the whole motor built for it. I dont think you realize how serious a 250 shot is?

OutlawZ

iTrader: (4)

Yeah if you're going to run a 250 shot you're getting into serious territory... not super serious but serious enough....

3.875" stroke, 4.030 bore, and whatever rod you want to run will net 396 ci.... If I did a 396 i would do a 5.875" rod....

some things to think about is definitely the cam. You'll most definitely need a custom cam. talk to one of the vendors and have the cam spec'd to your heads.... i wouldn't do a 306.... the 306 is tossed around as the end all be all of hydro rollers but frankly cam technology has come around long since the CC306. ramp profiles are better with the better tech cams..... CC306 is a caveman cam.... definitely effective don't get me wrong but there are better ways to beat up your lifters..

get good lifters. don't skimp there. get good pushrods and good rocker studs and rockers.... don't skimp on the valvetrain.... hell if you're gonna run a massive cam spent the 1200 bucks and get shaft rockers... you CANNOT beat them with pedestal mount rockers... I don't care if you figure out how to put four girdles on there and run valvecovers so tall they stick out the hood you won't be jesel shaft rockers..

You're getting good advice tho. I haven't seen anyone trying to steer you wrong. if you want to do an intake like me and tony's get with either of us and we can help you out in that area as to what to avoid and what pitfalls you might encounter....

Fast93Z

iTrader: (1)

thanks guys fro your input i will definitely get with you guys to see what I'm going to do as for right now the project is on hold money is a little tight i hope i can get it done by the ltx shootout but if not ill still be there and then the following year ill bring that monsta out there its a six speed so I'm probably going to get the twin disc and yeah i think the best part about my car is going to be the valve train I'm definitely going to get shaft rockers.

Fast93Z

iTrader: (1)

what cam should i get for the 396, i definitly want solid roller setup and want to make the most power with the lt4 heads, should i talk to LE for a custom grind or what should i get the motor is going to be seeing atleast a 300 to 400 shot of spray direct port, but i want something that makes a **** load of power but has a nice choppy tone, im getting the heads done at LE so should i have him make me a cam, if i dont go that route it will definitly be AI.

Fast93Z

iTrader: (1)

also i wanted to see if anyone had any reccomendations on pistons for it i am looking to achieve at least 12:1 compression

xx_ED_xx

iTrader: (17)

any one built a 4 inch stroke lt1? and just for the math inferior folks thats a 408

Speed Density

iTrader: (38)

A 300-400hp shot is no joke dude. Thats a **** ton of gas.

And you need to determine what your gasket thickness, chamber size and other factors before your can determine a DCR.

Stroked96Bowtie

iTrader: (22)

Determine what heads you want to run, this will give you the chamber size and flow capability. From there you can pick your pistons and cam size you want to run.

To hold that kind of shot, you're looking at needing top dollar parts. Price out oliver rods, custom JE's, callies or equivalent crank. You'll have about $3500-$4000 in the rotating assembly easily.