Re: McCulloch VS57 on a 359 Straight Eight

Posted by Anthony Pallett On 2013/5/25 0:45:26

They do but all stainless valves are not crated equal. A lot of more "modern" engines use stainless on the exhaust from the factory but that does not mean it compares to a high performance stainless valve in any way.
Flat heads in general tend to run on the hotter side of things and the L8 Packard really does not have a lot of water in the block when compared to say a 302 GMC 6 or Stove Bolt Chevy 6 which are contemporary though over had valve engines to the straight 8 Packard.
You throw a supercharger on top of that which is known as a general rule of thumb to increase engine heat you have the potential for problems.
Egge sells Packard L8 valves for around $20.00 a piece you will spend close to 4 times that for some super duty custom Manley valves but you get what you pay for.
In my 327 project that will be running forced induction (though it will be at a higher boost lever than the 4psi from a vintage Paxton unit) I wouldn't even consider an Egge valve.
Not saying an Egge valve is a bad valve I have built many stock or slightly modified vintage engines with them with no failures but in something supercharged that is being build for more spirited driving than what most people put there classics through you cant replace quality.