W2 Heads

DC 340 said

Now this part I am not sure of its purpose. It's a spacer/bolt package P4007712. I know one is used on each head where the head bolt boss is low over the intake runners. I always read you need these for ported W2s. I am guessing they help distribute the head bolt clamp force over the ported intake runners since that area is thinned from porting. Anyone know if this is correct?

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Those bolts and spacers go into the short head bolt hole on each head. I’m talking about the one short bolt in the upper row on each side.

When you correctly (fully) port any early W2 or Pcar head, you will break through into that low bolt boss.

That spacer gets glued into the bolt boss where you break through to seal the leak.


I‘m jealous of your rockers. Those Norris Rockers are the cats arse for sure.

Edit: Please take PBR’s advice and cut those adapter flanges into three pieces. They suck when they are one piece like that, and they will leak (most likely). And you’ll probably have to use a plug with a 5/8 hex like a C series Champion because even with the adapter cut and trimmed it’s hard to get a 13/16 hex plug in there.

Plus those 13/16 hex plugs are just plain clunky.