Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

[Ecotec] Changing head bolts

Fu Manchu

We’ll get together. Have a few laughs.
Joined
Mar 18, 2006
Messages
17,945
Reaction score
22,638
Points
113
Location
WA.
Members Ride
VZ Crewman, VZ Cross 8, & ya mum.

Immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
22,614
Reaction score
20,491
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX Calais II L67
Yeah but look at the size and number of bolts on that sucker. He says you don't need to upgrade until they fail, that is a good point but when you apply a lot of boost to something with only 4 small bolts per cylinder it's going to fail a lot faster than what he's got there in front of him. GM actually put a lot of thought into that motor with input from himself.
 

Draimond

Well-Known Member
Joined
Aug 28, 2008
Messages
285
Reaction score
260
Points
63
Location
Brisbane
Members Ride
VS V6 Executive
Ecotec head bolts are a known upgrade point when increasing cylinder pressure.
CornFedBoost tapped Ethel a size up in head bolts and had a gasket failure not that long after nearly hitting the 1000hp mark on that V6
 

07GTS

Well-Known Member
Joined
Sep 8, 2013
Messages
4,998
Reaction score
6,671
Points
113
Location
Australia
Members Ride
VEGTS BUILT BLOWN E85
if ur pushing 1000 hp on a ecotec then u better have copper head gaskets or orings to keep that boost level contained within, head studs wont help much with a normal head gasket for those pressures
 

Draimond

Well-Known Member
Joined
Aug 28, 2008
Messages
285
Reaction score
260
Points
63
Location
Brisbane
Members Ride
VS V6 Executive
guess what's missing from what I wrote above was that he got a lot of engine time (at lower power / boost levels) running ARP studs & a MLS gasket.

I'm fuzzy on his long ecotec journey but I think he blew a few head gaskets over the years and iterations of Ethel and her multiple engines. Each time he improved the head sealing he also bumped the power target so it became a bit of a cyclical thing.

I’m taking an educated guess in thinking that the basic ARP 8740 with a Mace MLS gasket will hold 14 PSI and 400HP
 

Immortality

Can't live without smoky bacon!
Staff member
Joined
Apr 15, 2006
Messages
22,614
Reaction score
20,491
Points
113
Location
Sth Auck, NZ
Members Ride
HSV VS Senator, VX Calais II L67
I think he blew a gasket fairly much each time he was after more powa or gave it a good thrashing out on the track.

Unfortunately there is only so much you can do with 4 bolts per cylinder. The LS guys have the same issue with big power/high boost.
 

Deuce

Super Stock
Joined
Feb 5, 2012
Messages
4,491
Reaction score
4,716
Points
113
Location
Snobs Rock (or so the locals say)
Members Ride
'94 VR SS V8
I think he blew a gasket fairly much each time he was after more powa or gave it a good thrashing out on the track.

Unfortunately there is only so much you can do with 4 bolts per cylinder. The LS guys have the same issue with big power/high boost.
But LS guys (with pockets) can switch up to SML block heads...
 

Fu Manchu

We’ll get together. Have a few laughs.
Joined
Mar 18, 2006
Messages
17,945
Reaction score
22,638
Points
113
Location
WA.
Members Ride
VZ Crewman, VZ Cross 8, & ya mum.
Ecotec head bolts are a known upgrade point when increasing cylinder pressure.
CornFedBoost tapped Ethel a size up in head bolts and had a gasket failure not that long after nearly hitting the 1000hp mark on that V6
The creations that come from his garage are amazing.
 
Top