drill heads?
Thread Starter
Instructor
Joined: Jun 2003
Posts: 143
Likes: 1
From: New Fairfield CT
drill heads?
Picked up a set of 64cc 2.02 reconditioned heads for my 71 350 rebuild. Pulled engine this weekend, as short block is due this week. I noitced that the hole for the water temp. sensor on the new head is 1/2" whereas the sender pulled out of the old head is 3/4". Should I have the new head re tapped for the old temp. sender or is there another unit I can use with my old gauges.
With all the "as long as i`m at it' going on this project, costs are rising looking to avoid another one! thanks guys
With all the "as long as i`m at it' going on this project, costs are rising looking to avoid another one! thanks guys
Le Mans Master
Joined: Mar 2004
Posts: 7,423
Likes: 1,458
From: Little Rock AR
You can go either route. I like to hog out the hole and re-tap. It is not difficult. You could ask a machine shop to do it but you can do it if you are careful. The other way involves calibrating the sender. That is more difficult IMO.
-Mark.
-Mark.
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
I walked into my local Carquest, told the guy what I was doing...and two minutes later I had the sensor for the smaller hole.
...and he didn't even have to look it up in the computer!
The auxiliary fan switch (for those that have one) is a little more challenging. The guy sold me a 1/2 brass fitting. I had to drill and tap a hole for the sender, which has a 3/8 coarse thread. Originally, the sensor was screwed into a larger-size fitting...very "bubba" considering GM did this originally!
...and he didn't even have to look it up in the computer!
The auxiliary fan switch (for those that have one) is a little more challenging. The guy sold me a 1/2 brass fitting. I had to drill and tap a hole for the sender, which has a 3/8 coarse thread. Originally, the sensor was screwed into a larger-size fitting...very "bubba" considering GM did this originally!
Last edited by page62; Feb 22, 2005 at 10:27 AM.
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
TS76 -- 22 bucks and some cents.
I'll let you know if it works...I should have it running this weekend. I don't see any reason why it wouldn't work...these things aren't rocket science. Perhaps the unit you got was faulty.
I'll let you know if it works...I should have it running this weekend. I don't see any reason why it wouldn't work...these things aren't rocket science. Perhaps the unit you got was faulty.
Melting Slicks
Joined: Dec 2000
Posts: 2,198
Likes: 2
From: Eastern Connecticut
I will be dealing with the same problem with my new heads. I hope this isn't too far off topic, but my 73 has a sender in both heads. One is for the temp gauge, but what is the other one? Is it a switch type sender? Any suggestions for a 1/2" replacement? Joe
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