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How to open bolt bores fo 1/2" studs

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Old Jan 5, 2016 | 02:21 PM
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Question How to open bolt bores fo 1/2" studs

Getting ready to start assy of my Bored/Destroked motor and need to know the proper way of opening the head bolt bores for 1/2" studs.
Ream them? Drill them?
How do you fella's handle this?

John
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Old Jan 5, 2016 | 03:03 PM
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Unibit.
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Old Jan 6, 2016 | 12:21 AM
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You should have had the machine shop that bored the block machine the block for 1/2" studs. Bring the block back to them for machining. Check your heads to see if they will fit 1/2" studs and if not, let them do that too; push rod holes also if running 3/8". Then jetclean.
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Old Jan 6, 2016 | 08:58 AM
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The block is already studded. Looking for info on the heads. The studs will not go thru the heads.
John
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Old Jan 6, 2016 | 12:21 PM
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I'd get the right size clearance drill (prob 17/32 for 1/2) with a pilot the size of the holes in the head.
Something like this picture
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Old Jan 7, 2016 | 06:38 AM
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Where can I find the piloted drill bit?
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Old Jan 8, 2016 | 02:42 PM
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Originally Posted by Mongo510
Where can I find the piloted drill bit?
If you are asking this question, you should most likely not being doing the work.
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Old Jan 11, 2016 | 05:48 AM
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You need a bit of material removed to run 3/8 pushrods





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Old Jan 11, 2016 | 07:24 AM
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Thanx DB, I was wondering about the PR holes, looks like a little work with the die grinder will take care of it.
I will have my machinist take care of the head bolt bores.
John
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