F-body alternator mount on Truck block
09-09-2011, 12:18 AM
#1
Staging Lane
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F-body alternator mount on Truck block Getting my 2005 5.3L ready to install in a couple of weeks and I'm running F-body accessory drive but need to drill and tap a boss the front of the block for the alternator bracket. I just need to know what size drill and tap to use. I know someone has done this.
09-09-2011, 04:51 PM
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I had been looking for it for about a week and finally came across this post:
"You need to drill the iron block with a 11/32" drill bit then tap it with a 1.5mm-10 tap to get enough bolts going through the alternator bracket. Keep your drill normal to to the block"
So the solution is found and now in a easier to locate post.
Thanks again
"You need to drill the iron block with a 11/32" drill bit then tap it with a 1.5mm-10 tap to get enough bolts going through the alternator bracket. Keep your drill normal to to the block"
So the solution is found and now in a easier to locate post.
Thanks again
09-09-2011, 05:04 PM
#6
Here is how I located the holes from this post: https://ls1tech.com/forums/14158248-post61.html
The first step for putting one of these on an iron block is to tap the untapped hole for the upper mounting bolt. I determined position by attaching the alternator backwards using the lower mounting hole, then I used a large drillbit piloting in the upper alternator hole to start a dimple in the block. Then I removed the alternator and swapped to a smaller bit appropriate for an M10x1.5 tap. Here is a picture of the pilot drill operation for establishing the hole location. I don't have pictures showing the tapping process.
