I used this calculator at the bottom of this link. But with these engine specs it gave me this. 12.6:1 Static and 8.8:1 Dynamic. Can I run 93 octane with that ratio and what about if I were to spray nitrous?

http://cochise.uia.net/pkelley2/DynamicCR.html

8 Cylinders
3.75 Stroke
4.030 Bore
54cc Chamber
.039 Head Gaskets
4.030 Head Gasket Bore
0 Piston to Deck Clearance
Flat Top -5cc Pistons

 

The SCR is right at 12.67, nees to know the IVC point to get DCR. Most probably will be fine with 8.8 DCR and 93 octane.

 

ttt

 

Need to know three things.

Intake Closing Point (ABDC)
Duration @.050
Lobe Lift

 

Hey Nick, Whats goin on bro..Heres the rest of the info

80.0 ABDC
240/244
110 lobe seperation

 

Ya have to use your advertised duration not @.050.
If it is figured right and ya entered the right inputs in "that" calculator and it came up with 8.8 ya will be fine. I used it a bunch before I got another one.

Give me your adv duration and the ICL (how much advance)and I will figure it for ya.

Presuming your 80* IVC is correct I come up with 12.59 Static and 8.75 DCR.

 

8.76:1 Dcr

12.67:1 Scr