Outer Limits 4x4 Board

Hey guys,

have had the cam sitting there for ages waiting to go in and now that I've got the engine out of the zook as part of my 34" swamper buildup I'm wondering whether it would be ok to put the new cam in using the original lifters that are already in the head?

I've heard that not using new or reconditioned lifters could cause some issues ? As to what those issues are I am not sure..... I'm probably just going to throw it in and see what happens.

THe cam is second hand and in excellent condition and I don't really know what the history of it is as to what the cam is supposed to produce power wise compared to stock. The leading edge of each cam has been reground a little like this....

SIde profile of the cam - reground cam pic is exaggerated so you get the idea

Don't miss match or use used lifters with a new/reground cam shaft it will drasticly shorten the life of it, just like you don't use a new piston and rings in an old bore.

why the hell would you regrind a cam that shape!! looks like it will promote valve bounce and overall have the valvle open less, (going by drawing shape) I'd take the stock shape over that one anyday

Yeah thats what i thought. Apparently it was reground by crow cams in melbourne...its not some dodgy backyard job... I'll have another look at it on monday. I could have the shape the wrong way around..

dan ill pull the other one out today and measure, i suspect the base circle has been ground down to allow a higher lobe to base circle ratio i.e. more lift. the profile does look odd, it may be a strange wear pattern, but it looks in good nick to be worn that much... maybe give the measurements to crow they will tell you what it is.

looking at the actual cam (the pic is a bit hard to see) it looks like it is opening the valve faster and later. not sure what bearing this would have on power delivery dont know enough about cam dynamics to say.

i think we should just put the stocker in and get her running happy again, with the gears and new rings, i think you will find it with more power anyway if not that turbo is still sitting there

Don't tempt me mate! I'm thinking with my gearing my wheel speed might suffer a bit hence the search for more power. Although cams, head shaving higher compression will make negligible seat of your pants power difference...how hard is a turbo manifold to fab up?