valve springs

Hey guys, I got some new valve springs and retainers for my Ecotec V6, but can’t find anybody who’ll fit them for me without taking the heads off. I’d really like to avoid having the heads off, machined etc. I’m from the Hunter/Newcastle NSW area. I know a few people here have done this job...

Video I did to help work out where engine noise is coming from. Lifters, supercharger coupler etc. L67 covered, much similar for L36 and LS. Heaps of how to vids out there already on fixing one thing. But I couldn't find one to work out what needs fixing in the first place, so did this one...

Hi all just wondering if I need to do any supporting mods to put heavy duty valve springs in my ecotec like pushrods or rockers or will they be strong enough?

Sorry if title doesnt help, new to the whole car mod thinf and couldnt find anything so I made an account to ask what I exactly need. I have a 04 VZ calais V6 (LY7 if that helps sorry) and I bought the camshaft package from mace engineering. I’ve been advised the valve springs will need to be...

Assuming both are brand new, what would perform better with high ratio roller rockers: 90lb stock springs or 105lb upgraded springs? I’ve seen mixed opinions from people, some claiming that stock springs will float at high RPM, some saying this is only true for old springs, and others saying...