fastsspr

iTrader: (49)

What are the limits of the ARP bolt in a force induction motor with 14 PSI in D1 procharger? Is better to use ARP studs with that boost? Why??

blacknyellow

iTrader: (3)

i'd use arp for any build

quik95lt1

iTrader: (7)

studs are always the safer bet espically on an engine that will be seeing higher cylinder pressure that are more likely to try and lift the head off the block........studs provide a stronger clamping force than bolts do.......when tightening a bolt there is not only a stretching force being encoutnered but also a rotational force......with a stud there is only a stretching force encountered which alows the bolt to be torqued/stretched more properly.......with your application i would run studs.....

willizm

iTrader: (10)

^what he said.

With FI always go head studs over head bolts

99Ls1fever

iTrader: (3)

Studs are the only way to go, They pull the head down, which keeps it from lifting instead of bolting the heads down where you are trying to contain the cylinder pressure.

Correct me if I am wrong but aren't the bolts a one time deal and then you need new ones where the studs you can always re-use?

quik95lt1

iTrader: (7)

GM bolts yes they are TTY bolts ARP's no they are re-usable.....but as with any bolt they do have a lifespan....eventually they will not return their stretch.....its at this point they will need to be replaced.....

WS6HUMMER

iTrader: (19)

With stock torque to yield bolts, yes one time use. ARP bolts can be reused, I prefer studs though.

99Ls1fever

iTrader: (3)

Thanks Guys, I wasnt to fimliar with the bolts, I have never ran them; I have always used the studs on all my motors

DavidPHumes

iTrader: (1)

If it's a budget build, IMO, ARP head bolts are more than sufficient (with LS9 head gaskets).

killernoodle

I think you are mistaken, both are applying pressure to the head down on the block. Studs tend to be better because they are fine thread on the nut and coarse where they go in the block. When you are tightening them down, the fine thread creates more clamping pressure for the same torque value because bolts will only have the coarse thread to tighten into. It also prevents stripping because you are not rotating the threads in the aluminum when you torque them down, so there is less wear on the threads in the block.

MikeFSKSpeed

iTrader: (37)

Studs are Ideal, But a set of ARP bolts are worlds better then the factory GM stuff.

99Ls1fever

iTrader: (3)

I agree the threads are the differance maker, but you are pulling down instead of bolting down

Blown06

iTrader: (32)

I ran the arp bolts on a combo with 706 heads and cometic gaskets up to 23 psi with no troubles. On C16 fuel and meth inj

quik95lt1

iTrader: (7)

how do you figure? lol they are both puting a downward force on the head to the block and causing stretch in the fastener.......as stated previously there are three main advantages......
1. Only a streting force applied to the stud upon torquing which eliminates rotational stress on the bolt when being tightened
2. You are tigtening a fine thread stud/nut which has a much higher clamping force threshold
3. in a race application its much easier to assemble the engine quickly with studs

and one of the biggest things with installing studs is to make sure you have a coating of moly lube/ assembly lube on both sides of the washer and the bottom of the nut.....you need a low friction contact between the faces of the head/washer/nut to get a proper reading.....dry installing will skew this number drastically....

firechicken76

iTrader: (14)

Sorry to Hijack the thread, but im doing a build on my ls1. im installing an mp112 magnacharger and going to make 8-10 psi. Im installing a set of ls9 gaskets, and i would like to go arp for bolts or studs. i know you guys say studs are better, but would bolts be fine for my build?

jt76

iTrader: (10)

I would say yes. Guys run turbo kits and SC kits on stock motors with the heads never off (i.e. shitty graphite HG's and stock bolts) on similar boost. The ARP bolts will be fine for this application.

I8UR4RD

iTrader: (16)

the re assurance that studs provide are well worth the extra money. i mean when that head lifts off and you you ruin them along with god knows what else....which is not as likely even with bolts but still a possibility given the design on the bolt patterns.