If someone was going to build a 18' (light weight) River Racer and wanted a very quick boat would a strong SmBlk on nitrous be a good choice ?
Regardless of the brand of engine used, Ford, Chevy or Mopar you could build a 650-700 hp Smblk at 6,750-7,000 with a 300 hp nitrous shot to get you 1,000 hp at 7,000 how would it stack up against a Big Block ?
It was raining yesterday before the game, so I had sometime to put this together. This is a 409" Smblk Ford that Danny Crower and I built for the 2004 Engine Master's competition. We made some good number's considering how little time we had to get it together and run it on the dyno. The custom rotating assembly was delivered 6 week's behind schedule. It's a long story that I can add later if you guy's are interested.
In any case, here are the dyno sheet's from the two combinations that we ran. This engine had to run from 2,500-6,500 on 91 octane. I dropped off the lower scale so it would fit better on the sheet's. I think (know) this engine with a few changes could make 700 HP at 6,800 to 7,000 with a single 4 barrel. Something to think about.....
Edit: I should add that the head's are cnc ported AFR 225's w/58cc chambers they flowed 306/201 cfm's. The heads intake stalled at .600 should flow closer to 325 but on the 4.00 bore there was just to much shrouding of the valve.
The engine made 1.61 hp per cubic inch and produced 2.15 hp per cfm.
Edit: The small cam that we ended up with had a .438 & .414 lobe lift and was 258/266 @ .050 with a 106 lobe seperation we ran 1.6 int and 1.5 ex. rockers. the lift was .701/.621. The Victor Jr. made the most HP and Trq the RPM Air Gap made the best power under 5,000 rpm. And the Super Victor was just too big for this application it was down on power and trq. from bottom to top.
With an .060 over bore to make the engine a 421 incher, and to unshroud the intake valve and a couple of tweaks the intake should flow 325. 325 x 2.15= 698.75 hp Should be in reach.
This is the engine with the Eldelbrock RPM Air Gap Dual Plane:
This is the same engine with a Victor Jr. Single Plane:
Here is a hand graph on the two engine's compared to each other:
Of these two combo's the Dual Plane RPM Air Gap was the better choice for the competition. Even though it was down 37 peak HP 620 vs 657 it was up on trq all the way from 2,500 to 4,900 and it stayed ahead on the Average numbers which is what the Engine Master's Competition is scored on.