350 to 327 engine swap
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
Your main concern will be if the 327 has cylinder heads with threaded holes to allow the later accessories to attach to the motor. Most 327 motors are pre-1969 vintage and didn't have accessory holes in cylinder heads, but maybe someone swapped the heads out for you to a later style.
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Your main concern will be if the 327 has cylinder heads with threaded holes to allow the later accessories to attach to the motor. Most 327 motors are pre-1969 vintage and didn't have accessory holes in cylinder heads, but maybe someone swapped the heads out for you to a later style.
X2 on the accessory mounting
Melting Slicks
Joined: Jun 2009
Posts: 2,709
Likes: 3
From: Savannah GA
"There's no substitute for cubic inches" is a true statement from a performance standpoint. Unless you have a free 327 in perfect running condition floating loose in the garage, spending the same dollars you will have in the 327 on the 350 should net greater gains in performance. May we ask why you are considering this swap?
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
There is one train of thought here...
You can twist a 327 pretty high which means that you could run silly gears without running out of motor. A friend back in the day did this with a Nova. He built a 302 and ran 5:13s...the car was snappy to say the least.
You can twist a 327 pretty high which means that you could run silly gears without running out of motor. A friend back in the day did this with a Nova. He built a 302 and ran 5:13s...the car was snappy to say the least.
Safety Car
Joined: Apr 2000
Posts: 3,802
Likes: 61
From: Wichita KS
The 350 based LT-1 replaced the 302 for Trans Am racing and it wound just as high but had more torque for twisting those rear gears.
It's up to you but I know which way I'd go.
cc
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Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
This was a pretty interesting article in last months Super Chevy, I tend to agree but think the 302 had a little advantage with they way they built it. The saying in my old days as a street racer was ALWAYS race a 302 Z/28 from a standing start NEVER from a rolling start not even a 5MPH roll! Link to motor article: http://www.superchevy.com/technical/...ing/index.html
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
You're going the wrong way. Stroke the 350 block to 383 instead of destroking it. 327's were the shnizzle in their day, but you didn't see many of 'em made after the 350 came out. Reckon there's a reason???
Instructor
Joined: Dec 2006
Posts: 167
Likes: 0
From: Oxnard/San Luis Obispo CA
Right. All things being equal "there's no replacement for displacement"
Burning Brakes
Joined: Dec 2008
Posts: 971
Likes: 45
From: Middlesex NJ
I am not sure but I believe the older heads may not accommodate the newer exhaust manifolds. I seem to remember the bolt patterns changed in the mid 70's not to mention some stuff might be metric in the 81. Not sure though. That may have been the 305's or 307's.
Le Mans Master
Joined: Jun 2005
Posts: 5,447
Likes: 3
From: Syracuse NY
This was a pretty interesting article in last months Super Chevy, I tend to agree but think the 302 had a little advantage with they way they built it. The saying in my old days as a street racer was ALWAYS race a 302 Z/28 from a standing start NEVER from a rolling start not even a 5MPH roll! Link to motor article: http://www.superchevy.com/technical/...ing/index.html
.HORSEPOWER NUMBERS
RPM 302 327 350 350 ('71)
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)
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
Last edited by DZRick; Oct 1, 2009 at 05:39 PM.
Race Director
Joined: Feb 1999
Posts: 16,978
Likes: 7
From: In Dreams There Is Truth Ohio
Le Mans Master
Joined: Dec 2003
Posts: 5,727
Likes: 38
From: Fremont CA
DJ has NOTHING on me, I have owned over five 68/69 302 Z/28 Camaros and six 70/72 LT-1 Vettes. Presently I own 2 LT-1 Vettes (OK I guess one is claimed by my wife but, I'm the one maintaining it.) 302s are OK but when push comes to shove, I'll take a LT-1 anytime!
Melting Slicks
Joined: Jun 2009
Posts: 2,709
Likes: 3
From: Savannah GA
Nirvana might just be found in a full Nascar spec SB2 from Hendrick or Childress. Never saw a dyno chart on a 9600 RPM unrestricted Cup engine but hear the 700 HP figure regularly enough to at least think it might be so. They live long enough to make 3 or 4 seasons in many of our street cars... we tend to be a low per year mileage group. Both organisations sell "customer" engines... wonder what the buy in requirement is?
Le Mans Master
Joined: Oct 2000
Posts: 6,362
Likes: 30
From: Oak Harbor WA
But if you want to know will it just bolt in just like the other one size wise? Yes it will. Externally it is the same engine.....the heads may cause you issues as already stated so look for the accy holes.
I agree with the others though...No replacement for cubic displacement. There is a reason all racing organizations limit the CID of an engine for a class.
Le Mans Master
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
This was a pretty interesting article in last months Super Chevy, I tend to agree but think the 302 had a little advantage with they way they built it. The saying in my old days as a street racer was ALWAYS race a 302 Z/28 from a standing start NEVER from a rolling start not even a 5MPH roll! Link to motor article: http://www.superchevy.com/technical/...ing/index.html
