squealingtires

iTrader: (14)

Can advance be ground into a cam after it has been ground? The way it is always referred to and worded makes it seem possible. Could I send in my cam and have some advance ground in? If possible what else will change?

orangeapeel

iTrader: (18)

Im sure if you could it might be more money than it is worth.

KCS

iTrader: (20)

no, just buy an adjustable timing chain set and you can advance/retard the cam to your hearts desire. A Rollmaster single roller costs about $100.
HERE

Fireball

iTrader: (21)

I'm a big fan of the comp adjustable set. loosen 3 cam bolts and turn a hex head adjuster and retighten cam bolts....instant cam phasing

squealingtires

iTrader: (14)

Really, I thought it had to do with the lobe separation angle between intake and exhaust. I'm still learning. I've got the SLP adjustable double roller so I'm good to go then. Any recomendations on advance from the timing chain for a Comp XER 238/240 .605/.609 on a 112 LSA. I'm wanting to move the power band down to peak around 6000 rpm in my 402 stroker.

1fastWS6

iTrader: (3)

You wouldn't be able to keep the same lobe profile (lift & duration) if you reground it at this point. It would end up a smaller cam.

What is the intake centerline now? 112? Don't know if you'll ever get that cam to peak at 6000. Maybe on a 106 or 108 ICL, but you'll likely give up a bunch of HP too. You may also run into p-v clearance issues on the intake valves advancing it that far.

Talk to Comp......

Fireball

iTrader: (21)

there are 2 variables you are referring to:

Lobe separation is the physical angle between the int and exh lobes. This is set once the cam is ground.

Advance/Retard is the amount the cam is rotated in the engine from the "straight up" position of where the center of the intake lobe is set to the crankshaft angle = to the lobe separation angle. You can have a cam ground with a specified advance, or you can physically do it by rotating the cam with respect to the timing gear (by means of an adjustable chain set)

Fireball

iTrader: (21)

Problem is you have to pull the lower gear off to change your angle. This means you have to pull the oil pump again.

squealingtires

iTrader: (14)

yeah the intake centerline is at 112. Come to think of it. Making that cam peak at 6000 will probably be impossible now that you mention P to V issues. Comp says on 346 with good heads etc. the cam peaks aroun 7400 when installed straight up. All things being equal, what do you thing the larger 402 displacement will bring that down to?

Ryne @ CMS

iTrader: (10)

i dont know about 7400RPMS, think you would need around a 250ish duration cam for that, even with heads

KCS

iTrader: (20)

As the RPM increases, the camshaft will not be able to fill up the cylinders of the 402 with air as well as it could a 346ci motor, therefore the tq curve will fall off sooner. Usually, as you add displacement, the camshaft will "act" smaller.

Unaffliated Racing

iTrader: (15)

Incorrect. You could use the same profile. The material would just be taken off of what is left of the base circle. The same if you wanted to change the lobe profile a bit...it would come off of the base circle. You really can't change the lobe seperation any at all...it's pretty much set after the cam is ground. Comp has to keep many cores to make the cams you guys want. A core will only do so much...for example, they may have a core that is 220 intake and exhaust with a 112 lobe seperation. It still has plenty of room but will only go from say 216 to 224 and probably 110 to 114 on the lobe sep. So after it is ground to 224/224 113 and depending on the base circle left...you could add or subtract a few degrees on the intake and exhaust but you can't change the lobe seperation. BTW a regrind from Comp usually costs about $115...that is you supplying the core. You could regrind a stock cam if you wanted...it would get the fast comp ramps but would only end up 205-210 at the most...and still have the stock seperation...116-119 depending on the year of the cam.

moeZ28

iTrader: (7)

that cam has two degrees ground into it and peaks as is somewhere between 6300 and 6500 in a friend of mines m6 346ci heads and cam car.