Forgotten.... What thread size are head studs into the block ?

[Phil Waterman]

Hi Richard

I like the 1/2 diameter spiral wire brushes in a drill at low speed to clean stud/bolt holes as a first step in cleaning threads. Soak the threads with the acetone and ATF over night or a couple of days then run the spiral wire brush in with the drill at slow speed when it bottoms reverse and run it out. I buy the cheap ones when I see them at flea markets.

Then as Lynn suggests use a worn tap of the correct size.

Which gets back to your original question what size? From time to time I have seen thread chaser sets which are intended for this purpose to clean but not really cut into the threads.

Cheers Phil

[Lynn Eades]

Here is a pic of how Henry set it up. One is variable and one is a switch.
(two terminal and one terminal, are wired in series)
I will also include a bit on the oil pressure sender. Be aware that there are two types of different resistance. you need the one to match your guage. The early one is harder to find. (I think the later one has "80" in a circle stamped on the face of the brass square.

[RichardT10829]

That's great thanks Lynn, I have the oil sender which is getting tested this weekend (fingers crossed it works.... Bloody expensive they are !

I will try and trace down the second temp sender with the two posts on, I have the single post one in the head (again to be tested at the weekend)

[Tony Smith]

Originally Posted by Lynn Eades

I will also include a bit on the oil pressure sender. Be aware that there are two types of different resistance. you need the one to match your guage. The early one is harder to find. (I think the later one has "80" in a circle stamped on the face of the brass square.

50lb sender

80lb sender

Note that the 50lb sender MUST be used with a 50lb gauge, and the 80lb sender MUST be used with the 80lb gauge.

[RichardT10829]

Is there anything on the back of the gauge to tell you ? I have not got mine to hand...

Thanks for the link Tony, the one I saw on eBay in the states was £80 mind zero bids were made on it.

Should probably re title the thread as "useful V8 info"

[Andrew Rowe]

Correct me if I am wrong but the 50lb / 80lb pressure units go with their respective gauges , but also remember are there not two different types of oil pumps that can go in the sump , one high pressure and the lower pressure ones that the carriers use ( 50lb ). Macs auto in the States make repro sender units from ,I think Mexico , but these are for the 80lb units, so save your old low pressure units for reuse.