283

Originally Posted by blockboy_1

my friend just gave me a 283 small block.
what potential would this motor have, how much power can it put out

Originally Posted by techinspector1

I've run quite a few L31 heads on a 283/292 on the Dynosim and am amazed at the power that can be produced. Assuming that is would be possible to cut the L31 decks for 60 cc's (about 0.028") without making a cracking problem, you could make 9.19:1 static compression ratio with flat-top 5cc pistons and a 0.040" squish. I remember reading years ago when these heads came out that it was not recommended to use a domed piston with them to raise static c.r. I wouldn't do it anyway because in my opinion, the dome gets in the way of flame propogation across the chamber.

Of course, with this little motor, you have to rev the snot out of it to make the same power that you could with a 350 at lower r's, so you have to use a solid lifter cam, either a flat tappet or roller. I put together a Dynosim pull here to show what can be done with the motor.

283 bored 0.060" with flat-top, KB165 6cc pistons. Cut block decks to 9.015" for 0.010" piston deck height. Victor Reinz 5746 head gaskets, 4.100" bore, 0.025" compressed thickness for squish of 0.035". L31 heads with stock 1.94"/1.50" valves, screw-in studs, guide plates and spring pockets machined to 1.430" for Comp conventional #986 valve springs or 1.412" for 26986 beehives. Cut head decks 0.028"-0.030" for 60cc chambers, 9.15:1 static compression ratio. (598 cylinder, 60 head, 5.4 gasket, 2 deck, 6 piston).

1 3/4" long-tube, equal-length headers, RPM Vortec intake, 750 carb.

Compcams part number 12-224-4 solid lifter flat tappet cam, grind number 294S, 294/294, 248/248, 0.525"/0.525", 106/114/110, timing figures @ 0.050" tappet lift 18/50/58/10.

RPM HP TQ
3000 162 283
3500 216 323
4000 274 359
4500 330 385
5000 381 401
5500 412 394
6000 435 381
6500 445 360
7000 450 337
7500 447 313
8000 423 278

Motor makes 106.6% volumetric efficiency @5500 rpm's. Wouldn't this be a riot in a light car with a 4-speed/5-speed and some 4.56 gears??? 5000-8000 would feel so good, you'd probably lose your license pretty quickly.

Originally Posted by techinspector1

I ran a 292 on the DynoSim for a fellow on another forum.

It's tough to find affordable pistons that will yield 11.0:1 in a 292 with decent heads. Here's what I came up with just foolin' around on the DynoSim.
283 bored 0.060"
Keith Black hypers, KB166-060
L31 Vortec heads, cut 0.040" for 58cc chambers. Stock 1.94/1.50 valves, with springs and retainers matched to lift. Makes static compression ratio of 10.5:1. Heads are bone-stock except for springs and retainers and the 0.040" cut. You can rescue 'em out of a boneyard. Casting number 12558062 in a '96-'98 Chevy truck with 5700 Vortec motor. Look for a saw-tooth design on the front of the heads. Get the rail rockers and center bolt valve covers at the same time you're gettin' the heads.
CompCams solid flat tappet cam. 12-221-5, grind 280B-8, 280/285, 242/250, 507/532, 108.
Large tube stepped race headers
Edelbrock RPM Vortec intake w/750 carb
RPM HP TQ
3000 201 252
3500 253 380
4000 312 410
4500 372 434
5000 424 446
5500 457 436
6000 489 428
6500 502 406
7000 507 380
7500 505 354
8000 495 325
136 mph top speed @8000 w/4.88 gear, 28" tire. Use 3000+ stall converter with auto. Would be way more fun with a 4-spd/5-spd. I realize the original poster asked for a way to enlarge his 283 to pull a truck. This is not the motor to do that. This is a play-toy built the way Scooter might do it. I just wanted to dyno it and see what it looked like. Who says you can't make 500 hp out of a budget 283??? A guy might have to massage the domes a little to fit the chambers, but you'd still make 500 hp even if you dropped the SCR a couple of tenths.

BIG, the shorty headers, juice cam and the heads will kill the whole deal for you. That much cam will require some rpm's and the juice lifters will pump up around 6200. I've run enough motors through DynoSim to know. Don't know about F.I. Haven't dyno'd any yet. I think you're gonna be disappointed.

Originally Posted by Double_v23

Alright Check this out,

Vortec heads at 10:1 compression
Performer intake with 650 (or 600 for better low end) CFM Carb
Lunati Voodoo 60103LK Cam
Headers with free flowing exhaust.

You will need a higher stall for this application, or a manual transmission

So with the above parts which you shoudl be able to put together for around 1200 bucks you will be making

Peak Torque 370@4500 rpm
Pek Horsepower 373@6000 rpm

I think that this is your best bang for the buck. It will absolutley scream between 3000 and 6500 rpm. However if it is a tired motor you will want to freshen up the bottom end. Piston speed will be 3250 Ft/min at 6500 rpm and that is pushing the limits with your small journaled crankshaft.