i'm confused with the proper dcr calculation. i've been trying to use this calc due to seeming less complex than others. i get lost when cam talk comes into the discussion.

http://www.kb-silvolite.com/calc.php?action=comp

for figuring dcr w/ this calc, the require this: Intake Closing Point (degrees)
ABDC @ 0.050 lift plus 15 degrees. others here have stated using the closing degrees abdc at .006" in place of. is this right? yes i've been searching/reading and still can't get clarification which is why i'm posting. i appologize in advance to the seniors in this forum that may feel this is too much a newb ?

i've attached my cam card and all my specs. can someone help a brother out and give me some sort of confirmation that the dcr i've come up with is in fact fairly accurate? engines is literally appart awaiting re-assembly as we speak. nows the time for any changes.

head cc = 66.3
piston head volume = 0
gasket thickness = .045
gasket bore = 3.910
bore = 3.898
piston out of hole = -.007
stroke = 3.622
rod = 6.098
if my intake valve @ .006 closes at 67.5*
then my dcr should = 8.261
and my scr should = 10.605

does this look accurate? if not, why.

what is a stock ls1 dcr????????? 8.1?

 

anyone, anyone