i have 2 sets of heads, one set are factory 853 castings with known stock valves.

the others are 241's that have been hand ported and had the springs changed before i got them. i dont know if the valves were changed or not. the intake valves appear to be stock LS1 valves, but the exhaust valves are different.

the exhaust valves in the non stock heads have a larger fillet on them as well as a smaller dish in the head. see pictures.

is this a factory difference or are they aftermarket valves by chance? i cant feel a difference in weight, i havent weighed them yet but ill take them to class and put them on the scale and find out. these are the same lenght as every other factory exhaust valve i have so that rules out LS6 valves....any insight?

here are pictures.

"worked" head vavle







known stock valve





comparsion

 

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someone has to know....

 

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I don't believe that's a stock LS1 exhaust valve, but it may be the pictures deceiving me. But the back of the "worked" valve seems a lot flatter than a stock valve, and the neck of the valve almost seems to bulge in the "worked" valve as well. As to what it could be? I don't know. You probably aren't going to get answers here unless you ask "what tsp cam should I buy" so I suggest asking this question on hardcorels1.com where some actual smart engine builders hang out.

 

yes, the fillet area of the "worked" valve has a larger diameter, tapering down to the vavle stem itself. i keep trying to remember to grab them as i want to weigh them here at school.