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LS Engine Build - The Garage-Built LS Stroker, Part II

Last Month's Homebuilt 404ci LS Engine Is Now Making Noise Testing Four Different Cylinder Heads On The Garage-Built LS Stroker, Part II

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Test Data
Test 1 equipped the 404ci motor with stone-stock 6.0L heads and valves, adding Comp 26918 valvesprings along with the Edelbrock Victor Jr. cathedral-style intake manifold, a Holley 950 HP carburetor, a set of 17/8-inch chassis headers, and a pair of 3-inch Borla mufflers.

Test 2 used the same equipment except for the addition of a set of WCRCH CNC-ported 6.0L heads and the same springs.

Test 3 added a set of stock L92 heads along with the bigger Comp cam. The larger L92 intake ports also required an Edelbrock Victor Jr. L92 single-plane intake manifold. We retained the 950-cfm carburetor but added a 11/2-inch Wilson tapered carburetor spacer.

Test 4 added the GM Performance Parts CNC-ported L92 heads. The rest of the components remained the same as in Test 3.

RPM Test 1 Test 2 Test 3 Test 4
TQ HP TQ HP TQ HP TQ HP
2,400 412 188 412 188 418 191 417 190
2,600 423 209 423 210 431 214 428 213
2,800 432 230 433 231 440 235 437 234
3,000 439 250 441 252 446 255 443 253
3,200 444 270 447 272 449 273 447 272
3,400 449 290 452 293 452 292 449 290
3,600 454 311 458 314 457 313 453 310
3,800 460 333 464 336 465 336 458 332
4,000 466 356 472 359 475 362 466 355
4,200 472 378 481 384 487 390 476 381
4,400 477 400 490 410 498 418 487 408
4,600 480 421 498 436 508 445 497 435
4,800 481 440 503 460 514 469 504 461
5,000 480 457 505 480 516 491 509 484
5,200 474 470 501 496 514 509 510 505
5,400 465 478 492 506 509 523 508 522
5,600 450 480 478 509 501 535 502 536
5,800 429 474 460 508 491 543 495 547
6,000 405 463 440 503 480 548 485 554
6,200   466 550 474 559
6,400   448 546 460 561
6,600   428 539 444 558
AVG. 452.2 363.0 465.8 387.1 472.4 408.0 470.4 407.3
AVG. from 2,400 to 6,000 rpm   476.3 386.4 472.1 383.2
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