FAO, ARP 4age head stud users.....

[turbostar]

Hello people i just woundered when the the 4efte head is drilled to fit over the 4age head studs, how big should tje holes be drilled, is ther a particar clearance / tolerance needed to allow for expansion and contraction of the head? If any.

Hope u know what i mean

Thanks Dan

 

[venomconcepts]

better iv you as chris (350ep70gr) he knows the answer

 

[starletgtturbo1]

better iv you as chris (350ep70gr) he knows the answer

x2 or most machine shops should know

 

[turbostar]

Bump

 

[turbostar]

bump
im asking this as my machine shop are unsure as they have never had to do this to a head before, i dont think they have ever worked on a 4efte engine and head, lol
so i just said i would do some asking to fine out, if there is a certain tolerance etc to drill the head out, to accept the arp 4age head studs,

or can you just drill the holes say 1 mm bigger than the bolts size??

 

[starletgtturbo1]

the tolerance will be the same as normal 4e headbolts, just different size

 

[turbostar]

the tolerance will be the same as normal 4e headbolts, just different size

ok kewl,

 

[Sheldon]

why dont you buy 4E specific ones?

 

[AzE_B]

you dont have to drill them but its a a tight fit as there never dead stright i had mine done .5mm and you will need to make the holes in the gasket bigger plus you need to cut 2 down so they dont hit the cam gears and mill the head out to get a 12mm scoket in there its a lot of fucking about what power you going for

 

[MARK@CMBAUTOS]

you dont have to drill them but its a a tight fit as there never dead stright i had mine done .5mm and you will need to make the holes in the gasket bigger plus you need to cut 2 down so they dont hit the cam gears and mill the head out to get a 12mm scoket in there its a lot of fucking about what power you going for

x2 im doing a 5e build at the moment and this is exaclty what im doing

 

[D3N0]

Is there a known fault with using the E series ARP head studs?
I dont know of any, except for people over tightening them that is.
So why bother spend the extra money & time, when its just not necessary.

 

[AzE_B]

My head still lifted with the 4e arp head bolts

 

[GP82]

Is there a known fault with using the E series ARP head studs?
I dont know of any, except for people over tightening them that is.
So why bother spend the extra money & time, when its just not necessary.

The stock and ARP bolts are torque to yield. The studs do not stretch.

Franza1 gives a very good explanation in this thread;

http://www.toyotagtturbo.com/forums...ead-studs-are-over-hyped&highlight=head+studs

 

[dupri]

why did your head lifeted with arp bolt

 

[AdamB]

Too much boost can still cause the head to lift even with ARP's