stilealive

A shop told me that ARP has made an OEM size head stud kit that has the same torque specs as 1/2" head studs provide.......

True......? I can't find them.

Floorman279

iTrader: (11)

is he talking about the custom age 625 ones? they are 400 ish bucks and part number starts with CA.....u torque them to 100 pounds

AwesomeAuto

The custom aged series is like 700+.

stilealive

So is this the right ones for my iron LQ9 block.........

https://www.briantooleyracing.com/ar...-234-4314.html

stilealive

.....Anyone know if these will fit my LQ9.......no reply from Tooley.......

https://www.briantooleyracing.com/ar...-234-4314.html

stevieturbo

What length bolts/studs are currently in your block ? Then you can confirm for sure.

stilealive

I have no idea. They were in my last engine that was built many years ago....436ci stroker. Now they are in my LQ9.

tblentrprz

what year?

stilealive

My LQ9 was built in 2012.......by AES

spray280

iTrader: (5)

Just used the Tick 1/2" plate kit to drill & tap an iron 6.0 block last night. It's a bit of work but the 1/2" studs are a good bit beefier. Whole kit with studs is cheaper than the 625's.

stilealive

Does the block need to be bare to drill and install the 1/2” studs? Or can I simply remove my old heads, drill/install the 1/2” studs and put my new gaskets and heads on?

Are the torque specs 100 ft/lbs for the 1/2” studs. If yes, then the 625’s are just a much easier and faster job. They are 100 ft/lbs each.

TrendSetter

the year the block was manufactured will determine whether you need 3 different length studs or two different length studs. thats the difference in the stud kits.

stevieturbo

If you have the room and can ensure no debris gets anywhere that matters, potentially you could do it in situ. It would be very uncomfortable though.

And what torque any stud can hold will depend on the quality of that stud. I'm going to guess the cheap Cleveland 1/2" studs I assume they are offering are just regular 8740....which really does question if it's worth it over the 625 11mm studs.

When I done my block for 1/2" I opted for the more expensive Viper studs in ARP2000 material. I think they quote you can go to around 120lbft, although I just took them to around 100.
I had tried to buy 625's...wasted a total of 6 months over 2 suppliers and gave up in the end and got refunds from both.

If using truck manifolds, I'd have concerns about Cleveland studs fitting without fouling on anything. They're a little longer than the Viper studs, and the Viper ones are damn tight for clearance on mine. The Viper ones are only a fraction longer than the LS studs

TrendSetter

when going to so much more clamping strength, how much bore deflection do you start seeing? is there a need to rehone with a torque plate?

stevieturbo

Possibly...but I'm sure when making 1000hp, there's some bore flexing going on too. Maybe that will counter any twisting from the initial clamping lol.

SLOW SEDAN

iTrader: (13)

My questions would be what's the power goal, do either CA625 or 1/2" noticeably increase clamp, and what heads are required to actually get useful deck thickness to make it all worth it. Spending $800+ on studs and $2000+ on heads seem like a boondoggle for meager power goals.

I remember a film paper test showing clamping load between stock, typical studs, and either CA 625 or 1/2" studs but not sure where it ended up. I think this was also brought up along lines of the ching chong studs vs ARP, and then multiple chimed in with chinese stuff going 8's so why spend 2-3x as more for ARP when its not the weak point unless investing in other hard parts. Then you have sloppy guys running 8's with stock bolts

stevieturbo

I have the images from the paper film test somewhere.....somewhere. But I do recall that the 1/2" studs really did give a much better spread of clamp compared to the regular studs. No 625's back then though
And those were probably just regular 8740 1/2" too. I dont even think they used fancy heads for the test...cant recall.


Stock bolts ?

Mavn

iTrader: (3)

I just did 1/2 studs on my 5.3 Block. When I get home from work ill post the pictures. cant wait to run 40# On a stock 4 bolt block

Bad Apache

https://ls1tech.com/forums/forced-in...ead-studs.html

Thread with film paper pics. Post 41.

tblentrprz

Thanks for sharing. I suspect the factory head/deck pressure would drop significantly on the exhaust side with 1100F+ softening things up.