Cosworth Head Gasket/head bolts

[red reading]

i think its just incorrect fitting to be honest.

they pull the deck face up from not having enough thred in the block, over torqueing them makes this worse and not enough torque means the head gasket leak's. mark these have caused more failures than anything else, they failed in an engine i did and were re-torqued as stated. standard head bolts are 12.5 mm and have been used for 600bhp and beyond with out fault so why fit something that is not needed.

 

[PULSGTI-R]

Okay thanks everyone for all your advice Cosworth gasket with stock bolts it is then.
Cheers

 

[williams]

the ones i had bottomed out and had enough thread. dunno if they could of changed the design?

 

[Thor]

I now have the cosworth gasket too but i don´t understand where is the problem with the bolts? The holes are big enough for my ARP head studs but how much tourqe they must have that the gasket is not leaking?

 

[red reading]

Compare the thread amount between a standard head bolt and a ARP stud.

 

[Thor]

I mean the ARP said 115NM with lube but if i read the cosworth HG leaking if the tourqe is not enough i´m unsure....