This is our way of modifying the wonderful FloTek 102-505 aluminum Small Block Chevy head for use on a 400 Small Block which requires steam holes.
I am SURE FloTek can provide this service if you contact them, as I rank their customer service A1+. I spoke with Stephanie and was told of I had ANY questions at all to just call and ask.
I had no problems (thank goodness) doing this mod on my back porch floor, although a drill press would have been the best way.
I have slinder fingers and could feel the "pads" and the support casting that is in between the cylinders and hit every one, adjusting the angle of the drill as needed for each hole. I started with 30* but ended up with what looks like 40* or so. No structural integrity was compromised with this modification if done without hitting the inside support cross casting.
I used a 9/64" bit for all of the holes and enlarged the exhaust side holes to 13/64" and radiused the holes with a 1/2" bit for the specifics on MY modifications. I may enlarge the bottom (exhaust side) holes if I feel it is needed.
I hope this helps others out with their questions and please give a like if you think its worth it!
I marked the spots to drill with a FelPro #8364PT gasket and center punched the holes so the drill wouldn't walk on me. Go SLOW!!!
Thanks to FloTek for the great customer support!!!
Marty Wilson
Wilson Racing and Engine Shop

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