I'm not sure why you would want to do this. Is this a speed "secret" that you saw somewhere? Are you confusing Y-Blocks with Ford Flatheads, where the block is relieved for better flow from the valves that are in the block to the cylinder?

"The Master Cylinder"

Enjoying life at the beach in SOCAL

Why?

Frank/Rebop

Bristol, In ( by Elkhart) 

Guys;

I've built a couple of other Y-Blocks, but never have tried this before so I'm a bit nervous. Anyway, before I put the carbide to the iron I would like your advice and even "is this trip even necessary"?

This is my 331 cu.in. blower motor project using a modified VS57 supercharger with a high output impeller that John Erb says should produce 7-9 psi boost. I got some pictures and info on how to do it and I'm posting a couple of pictures here of what I'm planning;

Using new Fel-Pro Permatorque head gaskets I set scribe lines in blue dye. The cylinder ring ridge is about 0.300" from the deck so using an old (borrowed) piston I set it in the hole about 1/2 way to the ring ridge(0.150") as a guide. The black duct tape on the piston is so I won't gouge it by accident. USing a carbide burr I'll SLOWLY cut out these areas being careful to stay inside the scribe line. I'll buff the cut outs with tapered rolls and cross buffs so carbon doesn't build up. That's basically the plan. I'll be using ported 471 heads and also planning on drilling a new road draft tube hole in the block where they were on the 56-57 motors to relieve crankcase pressure.

So, what are your thoughts? Is this step really necessary. I'm not proud, I'll stop right now if the benefit is minimal.

 Rono

  Ron Lane,  Meridian, ID