VS calais stock to super6

[355SENATOR]

Guys,

I have a v6 VS calais that i bought a stock supercharger running a 10psi pulley, I bought the whole conversion kits (idler pulleys and all) just to find that one of the heads is cracked (between the valves) now i have been told that the super6 heads are very different to stock, the Injector bosses are bigger and they are more flowed etc, so i was curious as to weather i could drill out the injector bosses and run stock heads or if i just drill one out and use the good super6 head and a stock one if it will create to many problems. I dont have much knowledge on the super6 set ups. Its a budget build as the full charger kit only cost me $600 so im looking at the cheap way out haha.

Your help will be much appreciated.

[cander24]

This is not that uncommon for L67 heads. The differences between L67 and stock ecotec heads is only in the injector being seated direct in the head rather than in the manifold like the ecotec. There is no differences in port sizes/shaping etc and run the same valves and springs etc. L67 heads actually come from the same mould as the ecotec and just have the boss for the injectors drilled out from factory. So, yes you can modify stock ecotec heads to use in an L67 application by drilling the correct size and angled holes in the boss.
If you want to consider another set of factory L67 heads I have a pair for sale at the moment and asking $250.
Cheers,
Chris

[355SENATOR]

Thanks mate, Yeah im very interested, are they in good nic? the heads are the only thing stopping me from bolting it all up. also with the compression factor the engine im putting it on has about 220000kms on it and i noticed from research that the L67 comes out with a lower compression ratio, i havn't had a chance to compression test the engine yet but im assuming with the compression loss over the time that the engine should hold 10psi?

PM me your mobile number and ill talk to you more about the heads over text?

[cander24]

L67 run 8.5:1 compression ratio as compared to the ecotec at 9.8:1
The higher compression is not in your favour in a boosted application, but with no more than 10psi max it will handle it fine. Internally the only other L67 difference is they run heavier forged rods and a larger diameter gudgeon pin.
PM sent

[355SENATOR]

Yeah, well its only going to be a daily, just want a bit more go then the stock 6 so it wont be getting a flogging haha

[GTS69]

i wouldnt be running the 10 psi pulley you will more than likely have detonation issues with the higher comp of the ecotec bottom end

[355SENATOR]

The kits came with it and it has a bolt on bolt off pully, if i can get away with running 10pound if i just cruise then i will but fingers crossed nothing bad happens haha, have any of you guys heard about copper compound headgaskets and if they are any good?