Sport quattro head washers for ARP head studs

[andy10v]

The standard washers don't fit. I tried it. I know people advise not to but I used the arp ones. Are they really that bad?

Dont fit over the arp thread?

[Christophski]

Nope, the standard washers I took off my aby didn't fit over the arp studs. I had to cut the heads off the old standard head bolts to get the washers off too

[Wheeljack]

The standard ARP washers are certainly a problem. Every head I've pulled that's used them has had the washers sunk into the aluminum; in one case bad enough that the bore was reduced making it a bear to even pull the head off over the stud threads.

I've found a solution and have been using them with good results since. They provide 54% more clamping area versus the standard ARP washers. I've been offering them on my site for folks in the US and Canada since...

http://brydon-eng.com/catalog/products/washer-cylinder-head-sport-quattro/

Of course, if you're crafty, you can figure out what will fit and where to get them...

[Rusty]

Certainly a cheaper option that having some made up, shame that shipping is as expensive as a full set and getting a batch sent through would incur customs charges...

[Rusty]

What's the OD of the studs? Can't remember off the top of my head.

[driftin jo]

11mm

[Rusty]

So we need a washer:-

• ID - 11mm ID (7/16")
• OD - 22 to 24mm (7/8" to 15/16")
• Thk - ~4mm (1/8" to 3/16")
• Material - Pressed or hardened mild steel / 303 stainless?

Sound about right?

I like those ones from the US, looking at $35 a set or so = £23 + 25% taxes = £30 a set for 12, so £2.50 each...

[Error404]

Did you see Thuppu's ones?





I wonder if Kev could do a batch of these up for a similar price to importing from the US?

[Rusty]

I linked to that thread in the original post

[Error404]

I'll get back in my box

[driftin jo]

So we need a washer:-

• ID - 11mm ID (7/16")
• OD - 22 to 24mm (7/8" to 15/16")
• Thk - ~4mm (1/8" to 3/16")
• Material - Pressed or hardened mild steel / 303 stainless?

Sound about right?

I like those ones from the US, looking at $35 a set or so = £23 + 25% taxes = £30 a set for 12, so £2.50 each...

If thuppu's are 22mm dia, looking at the pic, I would not have thought you could go bigger than that and you would have thought he would have used the maximum dia possible.

[Rusty]

Confusingly he states both 22mm diameter and 25mm diameter -

22mm - http://www.s2forum.com/forum/showpos...7&postcount=54

25mm - http://www.s2forum.com/forum/showpos...3&postcount=55

[Thuppu]

Those in pic one are 22mm first ones I did. The second pic washers isn't made by me, they came with the studs I bought, and they are 25mm. Some of them are quite tight fit, had to grind a couple of to get them fit. I have made some kits with 24,5mm OD size and they fit well, exept of the two ones that comes close to the chain, they need a little grinding. Have also made some diesel block 12mm stud ID washers as well... I can't make big batches of these, every washer is hand made of high tensile steel. I can only made a kit every here and then...

[Rusty]

Cheers for clearing that up.

[europeanme]

would titanium be a suitable alternative material?...