I posted this twice somehow! 
My son called me from Iraq while I was doing it and I got messed up. I'll delete one if someone will tell me how.
Sorry in advance if cam talk wears you out, but when you're trying to decide you have it on the mind. I've been talking on forum and reading and have had a lot of help and input. Here's what I did:
I took the specs of "blower cams" from a number of sources, including those names and sites of our favorite tuners and speedshops big and small (Tim, Jim, Scott, etc.). I came up with this - the "average" cam spec for what is described as a "Stage 2 (or equivalent) blower cam" (using a formula I made to account for the effect of each cam spec, not just numerical average) is:
226I/235E duration @ .050, .540I/542E, & 112.33* LSA.
Before anyone gets frustratred with me, I understand that you can't just average them because of the way duration works with lift, LSA, low end torque, vs midrange, etc., etc. BUT; it seems a reasonable way to guage the relative amount of mustard each one has compared to "average" and whether it falls within the range of values from low to high. So I then looked at each cam individually to see where it stacked up against the average in order to try and tell what that particular cam was emphasizing in terms of performance effect. As it turns out, the Comp Cam XE270AH, was the closest thing to the "average" of all the Stage 2 blower cams I checked. I did the same for Stage 3 cams and guess what? The XE278AH was closest to the "average" Stage 3 blower cam. Neither are listed as "blower cams", yet they are each the closest to the "average" Stage 2 or 3 bower cams and, obviously, both fall within the range of specs for Stage 2 or 3 blower cams.
So, does this mean that the 270 and 278 can make a good blower cam for a street/strip car making 10-12lbs boost with a s/c that you want to drive on the street with reasonable street manners? They have a 113* LSA which is more than some of the blower cams. Anyone have experience with a 270 or 278 on a 4.6 2v street/strip s/c'd car running in the high 11's but that runs pretty smooth from stoplight to stoplight? Thanks. (I apoligize if my assumptions are just plain stupid but I think they are close.)
Note: I've posted this question on another forum also. You guys have been helpful to me and I just wanted to see what kind of response it gets in each place. Thanks.
My son called me from Iraq while I was doing it and I got messed up. I'll delete one if someone will tell me how.Sorry in advance if cam talk wears you out, but when you're trying to decide you have it on the mind. I've been talking on forum and reading and have had a lot of help and input. Here's what I did:
I took the specs of "blower cams" from a number of sources, including those names and sites of our favorite tuners and speedshops big and small (Tim, Jim, Scott, etc.). I came up with this - the "average" cam spec for what is described as a "Stage 2 (or equivalent) blower cam" (using a formula I made to account for the effect of each cam spec, not just numerical average) is:
226I/235E duration @ .050, .540I/542E, & 112.33* LSA.
Before anyone gets frustratred with me, I understand that you can't just average them because of the way duration works with lift, LSA, low end torque, vs midrange, etc., etc. BUT; it seems a reasonable way to guage the relative amount of mustard each one has compared to "average" and whether it falls within the range of values from low to high. So I then looked at each cam individually to see where it stacked up against the average in order to try and tell what that particular cam was emphasizing in terms of performance effect. As it turns out, the Comp Cam XE270AH, was the closest thing to the "average" of all the Stage 2 blower cams I checked. I did the same for Stage 3 cams and guess what? The XE278AH was closest to the "average" Stage 3 blower cam. Neither are listed as "blower cams", yet they are each the closest to the "average" Stage 2 or 3 bower cams and, obviously, both fall within the range of specs for Stage 2 or 3 blower cams.
So, does this mean that the 270 and 278 can make a good blower cam for a street/strip car making 10-12lbs boost with a s/c that you want to drive on the street with reasonable street manners? They have a 113* LSA which is more than some of the blower cams. Anyone have experience with a 270 or 278 on a 4.6 2v street/strip s/c'd car running in the high 11's but that runs pretty smooth from stoplight to stoplight? Thanks. (I apoligize if my assumptions are just plain stupid but I think they are close.)
Note: I've posted this question on another forum also. You guys have been helpful to me and I just wanted to see what kind of response it gets in each place. Thanks.
You will be very happy with them.
