Putting a new cam in my 360
20-249-4 fits the bill all day, of the shelf, any debaters want to line it up?
Sure. Where would you like me to start? First did you read his engine specs at all before specing that cam? I'm gunna go with no. Did you read what he wants out of the cam at all before specing that cam? Again no. Did you read the cam's he is interested in to give you an idea of what kinda area he wants to be in? Also no.
You want to put a cam with 260 duration at .05 into a engine he specified as wanting low end torque in? You want to put a cam with that lift and duration into something with "aprox 9.5:1 compression" which really means he didn't CC the heads and it's most likely in the area of 9:1 compression. A cam with that duration and lift and an "RPM range" of 4000-7000. Yup. Sounds like a street engine to me. This folks, is how you make a dog. Did you even bother to figure out dynamic compression ratio?
I did. 6.67. That's assuming 9.5:1 static (at 0 altitude, victoria is all of 23 m above sea level). At 9:1 static? It's 6.34. That's a dog.
I'm not trying to be an ***. But if you're gunna come in all cocky like you know more than custom cam builders. At least spec a cam that would actually work in his situation.
What would I use? I would go with either COMP (yeah yeah I know) XE268H or XE274H. Both proven designs. The XE268H at 9.5:1 compression gives 7.84 dynamic. Hope you got good gas out there! That thing will need 91/92 at minimum. At 9:1 it gives 7.44 dynamic. 7.5 being the "ideal" iron head dynamic, that really fits the bill nicely. And the XE268H is known to be good for lots of low end torque. Lots of guys put them in truck 360's to get them to move. The XE274H at 9.5:1 gives 7.67 dynamic, or at 9:1 it gives 7.28. Very safe on premium pump gas. If you want to get away from comp and try lunati - 10200702 Duration @ .050 (Int/Exh): 220/226 and Gross Valve Lift (Int/Exh): .475/.494. Or a 10200703 Duration @ .050 (Int/Exh): 226/234 and Gross Valve Lift (Int/Exh): .494/.513. Both would be excellent choices. You will wanna keep an eye on dynamic compression ratio with them. The lunati's have more lift which I like. It's one of the reasons I'm considering going lunati solid roller in the winter.
Or call around, see what the cam guys recommend. And BE HONEST about your engine specs. How sure are you about the compression ratio? Make sure you know your setup inside and out. Then get the right part.
