Go Topless

I have a motor that I acquired and it has the following specs:
4 bolt
383ci block with forged pistons, connecting rods and forged 3.75 crank
222/232 @ .050
.510 intake/.540 exhaust
114 lobe center
10.5 to 1 compression ratio
Aluminum GM cylinder heads with 2.02/1.60 valves
130 lbs. springs w GM roller tip rockers
Heads are 180cc -225intake/186exhaust port sizes

Car has 255 fuel pump and stock fpr with 26lb injectors

tb is BBK 52mm

intake is a stock LT1

Is this a decent set up or what should I replace, I have the motor and heads in pieces right now. All of these parts have less than 1000 miles on them.

Could it be made to putout 500 horse wo NOS, if so what do i need to change? Would a SC be good for it?

Thanks for any help.

MachinistOne

Box it all up and take it into a machine shop to have them check all the parts. Head and intake porting will pick you up some power, but it looks like a good street motor. Bigger injectors would be on my list along with dynotuning once it's all back together.

Asking if it's a good combo all depends on what you intend to use the car for.

camarobird92

Definately need bigger injectors for a 383. In order to hit 500hp, the heads and intake will need to be ported and a bigger cam used.

95Blackhawk

500 FWHP? You will need to definitely do some head work and get a cam that allows you to spin to past 6300 RPM (not the one you call out).

Sounds like a fun project. Tell us how it turns out.

Black_95Formula

Look into getting an adjustable FPR, and as noted, bigger injectors. Also, might make sense to upgrade your 52mm to a 58mm TB and matching intake port, your 383 will need all the air it can get.

Are the rods I or H beam? With H beams and the 4 bolt main, you'll have a very strong bottom end that'll take pretty much anything you can throw at it. Do you have a 12-bolt rear? If not, the stocker will break in no time unless you baby it. I'd also look at beefing up the brakes/suspension to keep yourself safe with all that power.

Are you looking for street driveability or a drag strip setup?

James Montigny

Looks like it was setup up for a mild blower setup.
You might want to consider pistons with larger dishes if you want to run a lot of boost.

Probably not the best setup for an N/A or N20 car.
Cam is a little small and CR is too low.

I agree, porting the heads would be a big plus either way.
Make sure the heads get springs appropriate for the cam you end up using.

Injectors are too small for that setup, look for 36 or 42s.
Stock FPR is fine, just have the PCM tuned properly for your injector size and cam profile.

If you are buying it assembled, make absolutely sure the motor is properly balanced.
You don't want to find out the hard way once it's all installed and ready to go. (ask me how I know)
It's almost worth the money to tear it down and have it checked, then reassembled.

slomarao

I would try and boost up or drop down the compression. Depending on what your going to do there will be a few ways to do it. Either make it around 11.1, or 11.5.1 and go na with little n20 here and there. Or go 9.5.1., 9.1 and run a blower. But how you have it setup now will work either way, it just wont be optimal.

As for those heads, send them off to llyod and have him finish them off. He will get quite a bit more out of them, and you probably will get a discounted rate because half of the porting will be done. Have him take your castings to le3's so you can give the 383 the airflow its going to need to make good power. Than pick up a matching le3 cam, 58mmtb, and sell your current cam along with the 52mmtb. Get the intake ported for the 58mmtb and your good to go.

You can mill the heads to add some compression getting you to 11.1,11.2.1 and also run an impala gasket. Or you can open up the chambers to drop it down and run a thicker gasket. the two should get you to 9.7.1ish which would be ok for low to moderate boost.

It will have a sound bottom end so it can take some spray you want. It will be able to turn 7k, which with a le3 383 it should make 425rwhp+. But theres no way 26lb injectors are going to cut it. 38's or 42's are what you need.

If all you want is 500flywheel than just put in a larger cam. Unless you want a mild setup.
Good luck