Info: Drilling heads for extra headbolts L67
#11
09-27-2016, 03:41 PM
setup is as follows
L67 stroked to 4.2 (billet crank), H-beam rods, wiseco forged pistons, 8.0:1 compression, o-ringed block, copper head gaskets, ported heads, custom grind turbo cam, double roller timing chain, 150lb springs, YT platinum rockers 1.6, Garret GTX3582 turbo, all bolts and studs ARP ( including head studs )
thats the main things, making 686rwhp @29psi drops off to about 26,27psi
Never use to push water but can now hear a purculating sound when i turn engine off and expansion tank is full
funny thing is still makes power and no signs of anything wrong on the dyno.
L67 stroked to 4.2 (billet crank), H-beam rods, wiseco forged pistons, 8.0:1 compression, o-ringed block, copper head gaskets, ported heads, custom grind turbo cam, double roller timing chain, 150lb springs, YT platinum rockers 1.6, Garret GTX3582 turbo, all bolts and studs ARP ( including head studs )
thats the main things, making 686rwhp @29psi drops off to about 26,27psi
Never use to push water but can now hear a purculating sound when i turn engine off and expansion tank is full
funny thing is still makes power and no signs of anything wrong on the dyno.
The only thing I wonder about are those copper head gaskets. I know they're supposed to be great for race engines, but have heard issues with people running them on a street car, especially with coolant leaks. I have no personal experience, just what I've heard.
Have you tried to re- torque them? Have you tried pulling the heads to inspect the gaskets and deck surfaces? Just a couple thoughts...
#12
09-27-2016, 06:09 PM
Thanks
Car is a HSV XU6 ( holden commodore ) with a T56 magnum. The car was originally paired from factory with a 4L60E but i was always breaking it, even when built. no other option was available for this model and conversion kit was sourced from Mal Wood Automotive - Home
Fuel is e85, pretty much available at most united servos in melbourne and pumping the fuel is 2 x bosch 044, 6litre surge tank, magnafuel reg and ID1000 injectors
Still has more in it, have had it to 736 rwhp and dont know if that was the limit either, tuner wasnt comfortable going any further unless we find whats causing the air into the system and backed it off.
Bloody annoying, wonder if air can be forced through the intake runner cut outs into the water jacket cut outs, refering to the manifold gaskets. The alluminium gaskets have been fitted.
#13
09-30-2016, 09:24 PM
X2, I'm running the same stud/gasket setup and have also not had an issue with pushing water. Granted I'm making less power and a little less boost.
What is your setup OP? IMO this level of work should be done by a machine shop. To do it right, I'd think you'd want to re-hone the cylinders since the clamping forces will distort the bores slightly differently.
Plus I think the ZZP heads have a thicker deck too, although that may just be to make up for the aluminum.
What is your setup OP? IMO this level of work should be done by a machine shop. To do it right, I'd think you'd want to re-hone the cylinders since the clamping forces will distort the bores slightly differently.
Plus I think the ZZP heads have a thicker deck too, although that may just be to make up for the aluminum.