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Old 11-16-2012, 01:33 PM
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Dyno tests May shock some on the little 302 especially in the higher rpm ranges but every day driving is not in these ranges ! So consider well what your driving will be!


HORSEPOWER NUMBERS
RPM 302 327 350 350 ('71)_ the legendary LT-1
3000 167 196 208 199
3300 184 210 232 223
3500 206 232 254 246
3800 233 261 283 275
4000 248 275 298 291
4300 272 297 318 311
4500 283 308 329 324
4800 301 324 341 340
5000 311 333 347 347
5300 326 344 352 355
5500 333 349 353 361
5800 347 347 350 362
6000 350 348 348 361
6300 353 352 348 353
6500 356 347 342 345
6800 356 339 329 332
7000 352 331 312 319

TORQUE NUMBERS
RPM 302 327 350 350 ('71)-LT-1
3000 292 332 364 349
3300 293 334 369 354
3500 309 348 381 369
3800 322 360 391 379
4000 325 362 391 382
4300 332 363 389 380
4500 331 360 383 378
4800 329 355 373 372
5000 327 350 364 364
5300 323 341 349 352
5500 318 333 337 345
5800 314 314 317 328
6000 307 305 305 316
6300 295 293 290 295
6500 287 281 277 279
6800 275 262 254 257
7000 264 248 234 239



What are your head casting numbers from your 283?

A few of my tips on 302s and 283s: you build a 283 get head gaskets that fit the bore of the 283 don't get generic over the counter gaskets that fit from 283 to 400 bores, Cross drill and chanfer your crank, if you can afford it Chrome The crank journals ( I can see an argument LOL) I do it But my 302s hit over 8000 rpm! Make sure the machine shop you go to uses torgue plates , for High rpm use shaft rockers or at least a girdle, Dont use aluminum rockers, Be precice on all balancing, Use floating pins, Use only forged pistons, I use solid flat tappet cams (I have my reasons but to each his own) Other guys on here can add more or Ill be typing all day LOL and many may disagree with what I say LOL!

AIRFLOW DATA CFM: head castings #s
In/Ex In/Ex In/Ex In/Ex
Lift 186 *461 492 487
.050 30/20 30/21 30/22 31/22
.100 58/45 59/46 59/47 59/51
.200 113/87 115/93 115/92 119/102
.300 158/120 164/127 158/117 173/133
.400 190/136 201/155 186/127 207/144
.500 205/140 211/168 200/134 213/146
.600 205/141 212/174 209/137 215/146

*461 heads eliminated for test due to obvious porting; 327 was run with 186 heads.


Jester
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