What to look for when looking at flow figures: On the LS platform many people run a camshaft with a peak lift between 0.500-0.650. For this reason you want as much flow and velocity across the entire lift range (0.050-0.650) not just at peak valve lift. The camshaft is only ever briefly at peak lift, so your average flow figures across the entire range are what count the most. Why you should port your heads: EVERY modification you make that increases horsepower does so because some how what you did improved the engines ability to process more air. That is a simple but powerful statement that summarizes the nature of whats going on in your engine. A larger cold air intake, better air filter, better exhaust system, ported snout, ported blower, more boost by spinning the blower faster, camshaft swap…etc. All of these items will improve an engines ability to either get more air in or get more air out. Now realise every single one of these items must directly involve the air passing through the cylinder heads which is the path leading to and exiting the combustion process. Your intake/exhaust valves and cylinder heads represent the largest restriction in the airflow pipeline….. improving the intake and exhaust flow paths of any cylinder head has a direct and large effect on the output of the engine and all of the other systems mentioned play a supporting role in feeding (or evacuating) the cylinder heads. If you’re looking to build a really optimised, blown engine or naturally aspirated engine don’t overlook the heads because that’s where all of the real power is made. Price: Send us your stock cast LSA, LS3, LS9, L76, L77, L98, L92 cylinder heads and we can turn them into a killer combo for $1595 AUD
