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Was hoping someone could identify what this bolt hole on my '69 LT46 head was for. I was planning to use this to anchor my fuel line bracket (that I fabbed) to support both the 3/8 fuel line and the 1/4 inch return
vapor line. I'm having an issue lining up the bolt pitch and thread, nothing in my garage will thread in here.
Thanks for the reply - my setup is a bit different, but it looks like I can anchor my bracket on the outer intake manifold bolt as well. I have a Holley 4150 carb and an older
Edelbrock manifold that came with the car. I'd like to keep it as stock as possible so I am installing a more stock type GF-432 filter and installing the 1/4 fuel vapor line to the return line. I just wanted to provide a bracket for the setup and could not identify the bolt hole I originally wanted to use.
3/8-18. Same threads as the bolts that hold the water pump on the block and also the exhaust manifolds. You might need to run a tap in it or a thread chaser to clean out the threads. DUB
All the threaded accessory bolt holes in the Chevy heads are 3/8-16. Most of them are pretty corroded, dirty, and full of paint, so you need to run a bottoming-tap into the hole to clean up the threads before you try to use them.
All the threaded accessory bolt holes in the Chevy heads are 3/8-16. Most of them are pretty corroded, dirty, and full of paint, so you need to run a bottoming-tap into the hole to clean up the threads before you try to use them.
Lars
If you can't find a bottoming tap, just cut the taper off the end of one with a cut off wheel on a die grinder
Actually if you are cleaning threads you should really use a thread chaser/thread cleaner tool. It looks like a tap but it won't remove any thread material like a tap will.
DUB and Lars both incorrect in the same thread? Is this one of the harbingers of the Apocalypse?
No...I hope not......I feel it was my way....of showing that my brain can fart without notice.
Funny how.... I really do KNOW this...and I TYPED it ...and I actually READ IT....but my brain did not register that it was wrong and I STILL clicked 'Submit Reply'.
No...I hope not......I feel it was my way....of showing that my brain can fart without notice.
Funny how.... I really do KNOW this...and I TYPED it ...and I actually READ IT....but my brain did not register that it was wrong and I STILL clicked 'Submit Reply'.
DUB
Getting older is a cruel joke, it will happen more and more unfortunately
02-09-2019, 05:40 PM
What was this bolt hole used for?
