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LQ4 Short Block - 480 HP For $3,775

All It Takes Is A Boneyard 6.0L Truck Engine With A Mild Hydraulic Cam, A 750 Holley Carb, And Headers To Get Some Serious Horsepower

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CAMSHAFT DURATION
@ 0.050
LIFT
(INCHES)
LOBE
SEPARATION
ANGLE (LSA)
'99-'00 LQ4, Int. 191 0.457 114
PN 12560967, Exh. 190 0.466
'01-'06 LQ4, Int. 196 0.467 116
PN 12561721, Exh. 207 0.479
GMPP Hot Cam, Int. 219 0.525 112
PN 12480033, Exh. 228 0.525

Gen III Family Tree
The following is a genealogy of sorts, listing the bore and stroke combinations for the popular GM Gen III engines. Starting with the 5.3L engines, the stroke is consistent at 3.622 inches, with the larger bore being the difference in the displacement.

ENGINE DISPLACEMENT
(CUBIC INCHES)
BORE/STROKE COMPRESSION ROD LENGTH
4.8 293 3.78/3.268 9.5 6.276
5.3 325 3.78/3.622 9.5 6.098
5.7 346 3.898/3.622 9.5 6.098
5.7 346 3.898/3.622 10.1 6.098
6.0 (LQ4) 364 4.00/3.622 9.4 6.098
6.0 (LQ9) 364 4.00/3.622 10.0 6.098

Test 1 was with the stock, iron 6.0L short-block and production iron heads assisted with a GMPP single-plane intake manifold, a 750 Holley carburetor, and a set of 131/44-inch Kooks long-tube headers.

Test 2 kept all the original changes from Test 1 but added the GMPP hydraulic roller Hot cam and valvespring kit.

  TEST 1 TEST 2
RPM TQ HP TQ HP
2,200 406 170 399 168
2,400 403 184 392 179
2,600 403 199 393 194
2,800 406 216 401 214
3,000 411 235 414 237
3,200 418 255 427 260
4,300 424 275 435 281
3,600 429 294 438 299
3,800 433 313 437 315
4,000 436 332 434 331
4,200 437 350 434 347
4,400 439 368 436 366
4,600 439 384 441 387
4,800 437 399 447 408
5,000 432 411 450 428
5,200 424 420 450 444
5,400 412 424 444 456
5,600 398 425 436 466
5,800 383 424 430 475
6,000 367 419 423 483
Avg. 417 318 428 336
Power/ci 1.20 1.16 1.23 1.32
(peak)
SOURCES
Federal-Mogul (Fel-Pro)
2-48/-354-7700
federal-mogul.com/en
Holley Performance Products
1801 Russellville Rd.
Bowling Green, KY 42101
KY  42101
270-782-2900
www.holley.com
Kooks Custom Headers
North Bayshore
NY
866-586-5665
www.kookscustomheaders.com
GM Performance Parts
www.gmperformanceparts.com
LKQ
Chicago
IL
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1 comments
jbraz7
jbraz7

i looked up that hot cam kit with that part number and all of them say its for a 5.7L 97-03 ls1 not a 6.0 lq4?

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