Hi guy's, Rick..thank's for asking....
No nothing too serious, just your standard he's an @$$hole daddy, come rescue me 2500 miles that-a-way & 2500 miles back ride!
Yes...the intended use for this has changed a bit, I'm looking more at using it for some road trip's than a weekend warrior, but still looking to make good power and get some kind of mileage!
So anyway, I was crunching DCR numbers using online calculators and was surprised with what I discovered.
Now before I begin, I did pull one of the heads off just to double check my clearances, The head gasket I'm using is the Felpro 1003 the i.d. is 4.166, the thickness is .041.
I do have .003 on the deck, SCR comes in at 10.33, .044 Quench.
So this is what I discovered using these online calculators with the same original Isky cam.
Pat Kelley_______________7.68244 DCR
projectpontiac.com_______7.7 DCR
KB Silvolite United Eng.____8.194 DCR
Wallace Racing __________9.04 DCR
RB Racing RSR Advanced __9.28 DCR
Is it anybody's guess....or is one of these accurate?
I think i've scratched "all" the hair off my head......
It seem's there should be some kind of simple science to this!
I did a little research and the concensus is that Pat Kelley has the most accurate DCR calculator....
It also seems to be agreed that a DCR no higher than 8.5 with aluminum heads, EFI, coated flat top pistons, and a tighter quench area (somewhere between .030 and .050) creates a higher efficient burn that tends to counter pre-ignition with the use of pump gas.
Has anybody else run into this problem with such broad variances in calculating DCR with a single cam profile?
So many calculators....So little camshaft!
Thanks again....underpressure