CWC 540 233 is the camshaft core number. You will have to pull the camshaft to get the number(s) or letter(s) off the end of the camshaft to identify what the grind is. CWC is Campbell, Wyant and Cannon. The foundery has produced millions of camshaft cores. Camshaft grinders buy the cores then machine them to whatever specs. Aftermarket camshaft companies and automobile manufacturing companies, including Pontiac, use CWC cores. It is now called CWC Textron.
You will have to compress the valve springs the amount of lift and check if the spring is binding. Maybe take off the other rocker cover and pull the engine through to check what the clearances are.
How much if any play does the valve stem have in the valve guide? Is the seat damaged at all? Is there signs that the valves were floating? Is the pushrod bent? Is there wear in the rocker cup or on the ends of the pushrod?
I'd say at the least you'd have to remove all the valves and springs then inspect the head, valves, springs, seats, keepers etc. for damage.
Thanks for your reply!
I've already dropped off the heads off with the machine shop to be rebuilt, they are going to take a look & see if anything is out of ordinary with regard to signs of floating valves, play in the valve guides, wear on the rocker cups, etc. Everything on the pushrods seemed fine.
I ended up pulling the camshaft out halfway (without removing the radiator) and using my endoscope to get the numbers off the end of it.
Here's the markings:
Quote
X03R 3081B0 ISKENDERIAN I4 112 270 HYD MEGACAM 901
I emailed Isky Racing Cams customer support & they immediately told me it is their 270 Megacam, part 901271, with 0.465 lift, 270 degrees advance, 221 degrees of 0.050 duration, with a custom ground 112 degree lobe center.
Is there a rule of thumb for using performance vs stock valve springs? In this case I broke a valve spring with 0.465 lift. Could that be because I needed to have performance valve springs with that amount of lift? I don't know the origins of the broken valve spring, so I'm just assuming that it is stock.
Could anyone suggest valve springs for my Isky Mega 270 Hyd Megacam with 0.465 lift?
