I have a b16 with an AFI ramhorn manifold, garret turbo blah blah. 440hp. Well had it running for about a week or so. I have beaten on it a fair amount, and today my buddy pointed out that 4 of my studs on top where the manifold bolts to the head were sheared off. Studs are still there but the nut and rest of stud sheared off.

question-Anyone ever have this problem? if so what have you done to beef it up, or should i look into seeing if ARP hardware is the way to go? thanks

 

Yep happened to me. Go out and buy some stainless steel studs or buy bolts and make your own studs. That's what I did and haven't had a problem in years.

The problem with a lot of the studs people use is that they cannot take BOTH the weight and heat a turbo setup produces.

Also, make sure you have them tight enough. Sometimes they sheer off from the weight and not being torqued properly.

 

Ok thanks man. ya i figure it was the weight for sure....

 

does ARP make hardware for this?

 

I think kingmotorsports sells hardened bolts for this purpose.

 

Were the studs in the middle or towards the outside sheared off? Sometimes they can shear as the flange expands from heat. The holes in the manifold should be larger towards the outside to help account for this expansion. I'm not familiar with AFI manifolds to say if this is how they are but it's something else to check. Another method is to slot the flange between each runner to give the runners room to move.

 

^ good info

 

I have to look at the manifold again to check the outside flange holes. The bolts that sheared off were every single top on but the last rigt stud...All the bottoms are still in..

What do you mean by slot the flange between each runner?

Thanks for the help man...

 

yea i am having the same problem i saw that king had some stud but didnt get around to them yet. if you find anything than stock lmk

 

i tried to look quickly on their site but didn't find them with little time i had to get on to search.

 

Arp makes accessory studs that are 190000psi tinsel stregth and stainless steel. They come in odd number packGes so you either have to be shirt one stud or have like 7 to many I just get the package that leaves you one short and use a stock stud for that. I've had mine for 5 years without a single issue

 

I found a 10-pack of ARP stainless studs m8 x 1.25 38mm length (oem are 37mm). Part# 400-8022. But they are like $80 at JEGS

OP, do you have a flex pipe in the exhaust system? might help to cut down on vibrations.

 

I use the ARP accessory studs for better serviceability. The repeated install/removal of the stock bolts started to gull the threads. I studded them before it become worse.

 

ah im running open downpipe and i do not. i am going to get a full 3in back exhaust with flex pipe. But i will def look into that thanks man

 

Do NOT use King. Those are the ones that sheared off on me! Use ARP or another other stainless studs/bolts you can find. I believe I got my Stainless studs from mcmaster

 

Yo need to get longer than stock ones be ause they measure overall length of the stud and 1/4 inch of the tip of the stud is not threded