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The Big M block also has about the beefiest billet steel main caps on the planet. They’re needed to hold the Scat rotating assembly as it was regularly spinning to seven grand during testing and cranking out well over 700 hp. That number crept over 800 horses while trying out a combination with small-block rod journal sizes until, um, the crank broke. Mike Stine decided to stick with the big-block journals after that. Smart move.
| By The Numbers 483ci Big-Block Chevy |
| Bore: |
4.251 inches |
| Stroke: |
4.250 inches |
| Displacement: |
483 actual cubic inches |
| Compression ratio: |
11.3:1 |
| Camshaft: |
COMP Cams solid roller |
| Cam duration: |
260/262 degrees at .050-inch tappet rise |
| Valve lift: |
.635/.635 inch |
| Rocker ratio: |
1.7:1 ratio |
| Top ring: |
.032 inch |
| Second ring: |
.032 inch |
| Piston: |
CP forged dome |
| Block: |
Dart Big-M |
| Crankshaft: |
Scat 4340 forged |
| Rods: |
Scat 6.385-inch H-beam |
| Cylinder head: |
Brodix |
| Intake valve diameter: |
2.25 inches |
| Exhaust valve diameter: |
1.88 inches |
| Intake manifold: |
Edelbrock |
| Fuel injection: |
FAST XFI |
| Gaskets: |
Fel-Pro |
| Header: |
Beyea |
| Mufflers: |
Flowmaster Super 40 3-inch |
| Ignition: |
MSD 6AL |
| Damper: |
ATI |
| Fuel: |
VP100 |
| Fuel system: |
Aeromotive |
| Fasteners: |
ARP |
| Oil: |
AMSOIL 10W-30 |
| Oil pump: |
Melling |
 One of the tricks to making...  One of the tricks to making power that Mike’s learned in his 40 years of engine building is that friction is the enemy. The CP forged pistons took advantage of super-thin .032-inch-thick piston rings to reduce the radial tension pushing out on the cylinder walls and eating up valuable power.  Another trick was oil control....  Another trick was oil control. Charlie’s Oil Pans fabricated the pan with a lower sump that was sectioned off to hold 5 quarts of AMSOIL. By using a windage tray, then separating the sump oil from the false floor of the pan, Stine was able to keep the oil from aerating and losing steady oil pressure as well as controlling windage to reduce parasitic horsepower losses.  Mike Stine stands behind his...  Mike Stine stands behind his engines. Literally! At the 2011 Engine Masters Challenge he enjoyed the support of his wife but otherwise showed up alone, as his crew was unable to attend. One of the best things about the EMC is that the camaraderie among competitors is so good that everyone offers to help each other, so nobody is ever alone. PHR is looking forward to seeing the latest incarnation of this radical Rat motor at the 2012 EMC. Good luck, Mike!
| RPM: |
TQ: |
HP: |
| 2,500 |
521 |
248 |
| 2,600 |
525 |
260 |
| 2,700 |
523 |
269 |
| 2,800 |
518 |
276 |
| 2,900 |
511 |
282 |
| 3,000 |
504 |
288 |
| 3,100 |
506 |
299 |
| 3,200 |
516 |
314 |
| 3,300 |
528 |
332 |
| 3,400 |
541 |
350 |
| 3,500 |
552 |
368 |
| 3,600 |
557 |
382 |
| 3,700 |
560 |
395 |
| 3,800 |
565 |
409 |
| 3,900 |
569 |
422 |
| 4,000 |
579 |
441 |
| 4,100 |
594 |
464 |
| 4,200 |
607 |
486 |
| 4,300 |
620 |
507 |
| 4,400 |
628 |
526 |
| 4,500 |
635 |
544 |
| 4,600 |
640 |
561 |
| 4,700 |
645 |
577 |
| 4,800 |
647 |
591 |
| 4,900 |
647 |
604 |
| 5,000 |
646 |
615 |
| 5,100 |
644 |
625 |
| 5,200 |
643 |
636 |
| 5,300 |
641 |
647 |
| 5,400 |
640 |
658 |
| 5,500 |
638 |
669 |
| 5,600 |
636 |
678 |
| 5,700 |
632 |
686 |
| 5,800 |
628 |
694 |
| 5,900 |
623 |
700 |
| 6,000 |
618 |
706 |
| 6,100 |
614 |
713 |
| 6,200 |
609 |
719 |
| 6,300 |
603 |
723 |
| 6,400 |
595 |
725 |
| 6,500 |
587 |
726 |
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