Sounds like a buddy of mine is going to swap his cam pretty soon due to it being ground incorrectly. He wanted one kinda like mine with a 110 degree LSA which puts the ICL at 106 degrees.. optimum for a SBC as I have read. However what I was wondering is if a guy can instead get a cam ground with 112 degrees lobe sep to keep it running cleaner but still get 6 degrees advance ground in? What would be the benefits/disadvantage of going this route as opposed to 110 + 4... granted it can be done.

Now for those with desktop dynos specifically....

My buddy is currently running the XE230/236 112 + 4. I suggested if he wanted to keep the duration the same to go with comp lobes 3111/3122 instead. The rated duration is 286 degrees intake and 290 degrees exhaust vs 281/288 with the XE so the ramps arent QUITE so steep. But what I really like about this cam is the lift numbers with 1.5 RRs are .560 intake and .570 exhaust vs .544/.555(1.6 RRs) with the XE cam. I like higher lift and with this cam it shouldnt be any harder on valvetrain IMO since the ramps are a bit softer which should help reduce the effect of the higher lift... ultimately making more power. He will probably go the custom route but I am kinda curious if that cam would be nice for a street motor(my motor).

 

anybody...

 

Another question. Suppose you take 2 identical motors(LT1 of course) and install a mild cam like say XE218/224. First is ground 112 +6 and the other 110 +4... which will run faster?

 

I think you are gonna need some help from advanced tech.

 

Well first off... if the cam was ground with the wrong ICL, then you simply have to degree it. Wrong LSA or durations and you are screwed.

I dont think you should shoot for a target ICL, but rather valve events. Constant ICL allows you to keep the same intake lobes regardless of the LSA in order to tune the intake valve events, but I think you should look at the cams as a whole... Your best bet would be to have someone design it for you instead of guessing. But I dont think a 112+6 would be a very good idea, thats just me.

On the note of the XE lobes, I would make sure that he has a decently light valvetrain and good springs to keep the lifters in control. If he ran a rev kit and good beehives, I dont see any disadvantage to the XE lobes. There is also not always more power with more lift. Lift and lobe design should be centered around the flow charts.

Hope that helps some
-Stu