get the 502 cam and dont worry about smog.i Had the 503 cam in my stroker and i must say it was a torque monster but that was with ported heads programmed computer the whole shabang. Remember higher duration= better breathing up top. The stock heads dont breathe too well above 6000 anyways so why go with the biggest cam when the 502 will get you there??sure youll gain a LITTLE bit more HP with a big cam on stock heads but youll lose a LITTLE bit everywhere else too,so its basically a wash,get the 502 and end your worries about smog and have a VERY capable car with stock heads. JMHO

 

This post is very interesting. Just to give you guys an idea, I have the 218/230 cam on a 113 lobe seperation which is basically a hybrid of the 502/503. I put down 377rwhp/352tq with ported heads, LT's and the usual mods. Check out the sig for the dyno graph. Hope this helps.

 

Anyone else have an opinion between the XE 502 and the XE 503....?

 

Anyone, anyone at all.....all input is appreciated