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

[RichardT10829]

As or title, I want to buy a cleaning tap for my block, what size threads are the studs again?

[RichardT10829]

Cancel.... Got it it's 7/16 UNC

[Lynn Eades]

Richard, Try not to use a tap, unless you can get a well worn one.
Try grinding a groove in an old stud with your angle grinder, and use that. The least amount of "meat" you cut out, the better. It will be important to use a good thread seal anyhow, to prevent water running up the head studs.
As you know a slight relief will also help to transfer "load" out into the deck, as long as you are careful as the new studs will have a "bulge where they seat into the block deck.

[RichardT10829]

Cheers for that Lynn. I have an old thread cleaning tap the correct size so I just used that to chase out the threads.... All appears good ! The studs will be given a dose of sealant when I dial them in for good !

Just on a tangent here, the water jackets on the flatheads, are they split per bank ? Reason I ask is there's only one water temp sender which would be a bit daft as the gauge would only be telling you half the story so to speak (if the jackets are seperated)

[Ben]

Rich

Yes the banks are independant, a sender in each head doesn't hurt. You'll see a spike that way. I'm geared up for two into one gauge.

Ben

[RichardT10829]

That was my thoughts Ben, was not sure about two into one gauge but as you say the temp would spike and give you a heads up at least.