Cranky,
Thanks. The brand x on the left (actually its an Oldsmobile
) is the Rocket block motor for the Cobra. The differences are: Iron vs alum block, both are tall deck, raised cam, spread rail, stroker blocks. Both are 4" stroke, 6.25 rod, & 1.063 cd pistons. Cobra gets AFR 210's w\Vic jr vs 18 deg Chapmans with a spider. Both engines run the same cam lobes, the Cobra's is ground at 106 lobe separation to go with its 9.5:1 comp vs 108 w/13.5:1. Cobra has pumps on the front vs pumps on the bellhousing. Cobra has a heavier crank too. After experiencing the aluminum motor in the Cobra, the basic idea for the Rocket motor was to soften up the power delivery and still use the new crank, rods and pistons that I had, if I didn't already have the stuff , I would have built it at 380 in. These differences lowered the operating rpm by 600rpm and lowered the torque by 70 ft/lbs.
If I were to start from scratch ( read: if I could afford it
), I'd build an aluminum RDI at 418 ci with the SC1 head for the GRT. Pro Power just dyno'ed one at 812 hp. That head seems to be the strongest head in dirt Late Model right now. But... since I can't hook up what I've got (again read; since I can't afford it), I'll use the money for tires
. I'll say this, neither Ford or Chevy dominated DLM again this year, but one Chassis mfg'er did. Rocket Chassis went 1,2,3; 1-Ford, 2-Chevy, 3-Dodge. As you already know, all the power in the world ain't worth a darn if you can't hook it up.
Scott