XE258 cam ??
- Thread starter zoomie
- Start date
What are the exact specs on the cams. lift is what your concerned about. also you want to know the dish of your pistons now. things to think about aswell is have you ever shaved the decks on the heads or a prior owner. you don't see that much but people do that on occation for higher compression or possibly warped slightly. I am just throwing things out for you but hopefully someone here has done it and can just give you a yes or no. good luck.
Part #: Comp-35-510-8
258 / 266 - .533 / .544 lift are the specs for this cam
it is the comp cam XE 258Hr
apparently they dont make this cam anymore either for some reason
http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1055&sb=0
258 / 266 - .533 / .544 lift are the specs for this cam
it is the comp cam XE 258Hr
apparently they dont make this cam anymore either for some reason
http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1055&sb=0
it says in the catalog that it is a great replacement for the Ho cam
i never said my motor was staying stock lol
plans are the following
XE258 cam
gt40 heads,different springs, 1.6 rockers
gt40 upper and lower
lightning egr spacer
explorer or stang 65mm TB
stang SD computer,manual version
19# injectors
stang aod gov
shiftkit for aod
3.55 or 3.73 gears with tracloc this combo is basically an HO conversion done with better parts. so i was just trying to make sure that i could run the cam with the pistons i have now, i think i may have to either get diff pistons or have the current ones notched and have valve relifs or just get a an exploder motor or a reg HO motor
i never said my motor was staying stock lol
plans are the following
XE258 cam
gt40 heads,different springs, 1.6 rockers
gt40 upper and lower
lightning egr spacer
explorer or stang 65mm TB
stang SD computer,manual version
19# injectors
stang aod gov
shiftkit for aod
3.55 or 3.73 gears with tracloc this combo is basically an HO conversion done with better parts. so i was just trying to make sure that i could run the cam with the pistons i have now, i think i may have to either get diff pistons or have the current ones notched and have valve relifs or just get a an exploder motor or a reg HO motor
Your telling me that a lift in a cam does not mean anything. take a flattop piston for example. now imagine a cam with .3 lift and your swap for something with .5 just throwing sizes out but there is always the chance for piston slap. I would hate to knock a piston cause i told myself lift is no concern.
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OK, so lets start with the cam, its pretty simple. if lets say i have a cam with .3 lift and I decide i want a cam with say .9 lift and nothing else but the lift has changed then there is absolutely a chance that there will be no interference. it doesn't matter if the pistons are full flat top which was only used in 86 or if they have reliefs, you absolutely cannot give cam advice based on lift alone as lift while playing a part doesn't play a big enough part in itself to dictate p/v issues. A cam can be advanced or retarded 2* to change p/v clearance, a cam can be ground differently, the duration is a big player in cam fitment and selection and the total spec package is what is used to determine fitment issues.
As for pistons, just about every 289,302 and 351w has some kind of relief in the piston from the factory(86 year being the exception) be it 2 reliefs, 4 reliefs , reliefs with a dish or just a dish. We dont know what he has as theres always the exception to the rule but its more likely there are reliefs in his motor and if by chance there aren't, even in 86 we put cams in our motors so long as we watched the duration #'s there were no issues. When choosing any parts for a motor you cant look at the part as an individual, you have to have a working knowledge of the motor and how each part will work together with the rest of the platform, also knowing how different manufacturers rate or spec their product helps. one point to that is most companies base off of zero deck, I have yet to come across a stock motor that has zero deck and in fact its been more common to be .020-.030 in the hole which of course just adds more clearance for p/v. If thats the cam you want, buy it, when you are ready to upgrade your parts then you'll know. comp cams will take a cam back if its unopened years after you purchased it so you have time. If you cant wait then just look down a spark plug hole for reliefs.
As for pistons, just about every 289,302 and 351w has some kind of relief in the piston from the factory(86 year being the exception) be it 2 reliefs, 4 reliefs , reliefs with a dish or just a dish. We dont know what he has as theres always the exception to the rule but its more likely there are reliefs in his motor and if by chance there aren't, even in 86 we put cams in our motors so long as we watched the duration #'s there were no issues. When choosing any parts for a motor you cant look at the part as an individual, you have to have a working knowledge of the motor and how each part will work together with the rest of the platform, also knowing how different manufacturers rate or spec their product helps. one point to that is most companies base off of zero deck, I have yet to come across a stock motor that has zero deck and in fact its been more common to be .020-.030 in the hole which of course just adds more clearance for p/v. If thats the cam you want, buy it, when you are ready to upgrade your parts then you'll know. comp cams will take a cam back if its unopened years after you purchased it so you have time. If you cant wait then just look down a spark plug hole for reliefs.
awsome i appreciate the info mang! i never thought of looking down th eplug hole to see if it has relives or even dished for that matter. i was just hoping that if i can ( and know for a fact i can run a stock Ho cam with no issues) i hopefully can run that cam , i have a comp catalog at work so i did look it up the description says it is a good HO replacement for stock or mildly modded motors, im calling up comp tomarrow to make double sure.