Well I went to Summit and plugged in your paramaters and came up with Three
expanded the criteria a little and came up with the auto recommendations all over the place
Sealed Power 645 stock 181/192 @.050 .351/400 lift
Crane 693971 248/260 192/204 400/427 112 LCA H-248-2 1,000-4,000
Crane 693901 260/272 204/216 427/454 112LCA H 260-2 1,500-4,500
Comp 252H 252/252# 206/206 425/425 110 LCA IC 52 ABCD 800-4800
Comp XE-250-10 250/260# 206/212 432/444 110LCA
Vdoo 10200701 250/262# 213/220 454/275 108 LCA 1,000-5,500
Comp 20-221-3 256/268# 212/218 447/455 110LCA CRS XE256H-10 IC54ABCD
Vdoo 10200700 259/256# 208/213 454/454 112 LCA 1,400-5,700
Comp 20-210-2 260/260# 212/212 440/440 110LCA 1200-5200 CRS 260H-10
Crane 693511 268/272 212/220 460/380 112LCA
Sum 6901 276/288 218/228 441/441 114 LCA 1800-5500 **
Melling Class 1 278/282 198/199 410/412 111LCA
SUM 6900 278/288 204/214 421/444 112 LCA 1,200-5,000 ***
# at .006 adv rest are at .004 # compare with # without with without with each other you have to fudge- my best guess on relative duration
** 9:1 and higher compression, and gearing.
*** one of our Summit® classic cams
comp 260 closes intake 56ABCD 4 degrees later than 252H
4 degrees does make a difference voodoo 701 is even earlier- you can figure it out
I sorted sorta by intake duration- where the intake closes to get dynamic compression with your low compression
Comp XE 250 110LCA 106 ICL dyno COMP Cams XE250H Dyno Results
so what I get out of this is that the SUM 6901 with the wide LCA would idle great but close the intake late whereas the SUM 6900 would get the intake closed earlier with the slightly narrower 112 LCA look at the difference in the rev ranges
however both are really long cams for the amount of lift- you are leaving a lot of power on the table
you want more exhaust given the poor exhaust with LA heads and no headers
even the smallest crane is 10 degrees larger than stock
the 701 Voodoo gets the intake closed early with that 108 LCA most likely the best choice if you can find one in your budget more like a short Thumper/ Whiplash cam
IMHO you do not want the intake close point of either of the summit cams
If you do get the 6900 stick it in with an extra 4 degrees advance (but mileage will suffer)
