48 degree w2’s on 59 degree block

[ohiowoodchuck]

Anyone got any photos or care to share how much material needs to removed for pushrod clearance. I’ve read where they will fit. Any help would be appreciated.

 

[dodgedifferent2]

The picture above is of a W2 for use on a 48 degree lifter block. The bolt holes are the same so they will bolt on to a 59 degree block. There are a few differences.

The valve angle is 15 degrees on these 48 degree W2 heads versus the stock, stock replacement and 59 degree W2 heads 18 degree valve angle. Therefore you may not be able to use off the shelf small block pistons that are for 18 degree heads. It will depend on the application, cam, ..... you may need custom pistons or pistons designed for W7-W9 heads which for the most part have 15 degree valve angles (except for some exceptions like the Lemans W8 head).

The location of the rocker arm bolt holes is moved on the 48 degree heads and the pedestal pads are machined differently and you can only use Jesel or T&D rocker arm set ups as cast. typical W2 rocker arm set ups do not bolt on and work properly.

I do not believe the geometry of the 59 degree block tappet angle, pushrod angle and the use of the 48 degree rocker arm set up on the 48 degree head will be ideal when installed on a 59 degree block. This should be discussed with a knowledgeable small block engine builder like Ryan at Shady Dell.

48 degree W2 heads are not drilled for shaft oiling. You need to use pushrod oiling as cast.

 

[ohiowoodchuck]

That don’t seem right according to my mock up. Seems like it’s going to have to bored or hogged out toward the intake port.

 

[Rocket]

48 degree blocks have wider lifter spacing for the lifters to accommodate the wider intake port spacing of the W7 to W9 heads. If you are looking at a 59 degree block’s intake lifters and where they sit relative to a W2 or other LA head the pushrod will be closer to the intake port.

 

[ohiowoodchuck]

I’m going to have to mill some of the gasket lip also. I’m not sure if enough can be taken out and still have enough material to seal the valve cover. Maybe I’m wrong but I’m not seeing how this is going to come out smoothly.