Thread: Considering putting a blower on my 406 - have a few questions!

Tweet

Originally Posted by nitrowarrior

Keep the blower small (6-71 maybe). Definitely a cam change designed for your application. Head swap for breathing purposes (a bit more exhaust to evacuate). Siamesed bores on the 400 block will be a strength for you and if you already have adequate cooling, there should be no problems. Remember the camshaft centerlines and the overlap for a blown engine is dramatically different from naturaul aspiration. Crankshafts were known for breaking into two peices with the cast OEM 400 setup, be weary of what you wanna do until you know for sure which it is. And no matter which heads you run, please match the steam holes in the head for a stock block setup. Hope this helps.

yep I sure do have the steam holes drilled. I have iron vortecs for the engine. I dont think I would trust running the blower on the cast crank I have, In which my rotating assembly is now balanced, it would be a nice waste of my 175 if I decided to get another crank, rods, and pistons to match.

Obviously at 10:1 you are not going to tolerate very much boost. An alternative might be a centrifugal charger running about 4-6 psi maximum. Blow through a proper carb and you will get a reasonable cooling effect that might allow the 4-6 psi boost. If you also use an intercooler then the boosted charge will be nice and cool and the higher CR will less likely lead to problems. The bottom end is another story. They put blow through centrifugals on street cars with relatively high CR's commonly.

I'm considering one for my 502 with 9.6:1 CR. But I am also considering putting some larger heads on it to knock the CR down to 9:1 first.

Kitz