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Author Topic: Aftermarket cast iron heads  (Read 5877 times)
Big Block
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Posts: 1578

Location: NYC area

« Reply #15 on: March 27, 2018, 08:38:06 am »

Unless you're trying to open up a hole in wood and maybe soft aluminum, you wouldn't have the strength to hold a hand drill off angle to make it not follow an existing hole... 

A clamped piece on a rigid drill press has a better chance of going off center if it's not set up right.

85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
Big Block
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Posts: 755

Location: Chicago area (southside)

« Reply #16 on: April 05, 2018, 06:46:28 pm »

I have a set of GT40 heads from an Explorer 5.0 I got at the j/y a couple years ago. They already have 1/2" holes for the head bolts. 
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