Howdy guys,
So my 2V 1980 head just finished at the shop. It's got the VI port flow stainless valves, 1973 302 exhaust valve springs, new hardened seats, new guides, new seals, larger exhaust valve to 1.5", and he gave a light pass on the exhaust port side as well as took off .010" on the chamber side. I didn't want him to cut the chamber side till I got it back so I could CC it but it't too late now.
After running my calculations, I'm assuming stock bore/stroke/piston/deck height b/c I have no idea until I take the head off the car, I'm running a 8.789 comp ratio with a 50cc head. That's terrible. I'm planning on running at least in the 9's as it will compliment my 256H Schneider cam nicely. Here are my calculations: (all in inches and inches^3)
bore=3.68;
stroke=3.126;
gasBore=3.81;
gasThick=.044; Victor
chamber=16.387^-1*50; conversion from cc to in^3
piston=16.387^-1*6.5; conversion from cc to in^3
deck=.030;
cylinder=pi/4*bore^2*stroke;
gasVol=pi/4*gasBore^2*gasThick;
heightVol=pi/4*bore^2*deck;
VTDC=gasVol+heightVol+piston+chamber;
VBDC=VTDC+cylinder;
CompRatio=VBDC/VTDC
=8.789
The only way to get it where I want it looks like I need a FOMOCO gasket with a crush and bore of .024" and 3.75", respectively. With that gasket it gets me to 9.246, but I still have to shave the head to 50cc. Which I can live with. With this setup and my Schneider 256H cam, I'll have a 8.39 DCR. I think this will be alright with 92 octane, but what do you all think? Is 8.39 too high for a DD on 92 octane without worrying about heating issues or anything? If I change the chamber to 52cc, it puts me in the 9:1 SCR and 8.17 DCR. What is my best choice here?
I guess my final question now is, does anyone know of where I can get or have an old 200 FOMOCO gasket?
Thanks,
Ryan
So my 2V 1980 head just finished at the shop. It's got the VI port flow stainless valves, 1973 302 exhaust valve springs, new hardened seats, new guides, new seals, larger exhaust valve to 1.5", and he gave a light pass on the exhaust port side as well as took off .010" on the chamber side. I didn't want him to cut the chamber side till I got it back so I could CC it but it't too late now.
After running my calculations, I'm assuming stock bore/stroke/piston/deck height b/c I have no idea until I take the head off the car, I'm running a 8.789 comp ratio with a 50cc head. That's terrible. I'm planning on running at least in the 9's as it will compliment my 256H Schneider cam nicely. Here are my calculations: (all in inches and inches^3)
bore=3.68;
stroke=3.126;
gasBore=3.81;
gasThick=.044; Victor
chamber=16.387^-1*50; conversion from cc to in^3
piston=16.387^-1*6.5; conversion from cc to in^3
deck=.030;
cylinder=pi/4*bore^2*stroke;
gasVol=pi/4*gasBore^2*gasThick;
heightVol=pi/4*bore^2*deck;
VTDC=gasVol+heightVol+piston+chamber;
VBDC=VTDC+cylinder;
CompRatio=VBDC/VTDC
=8.789
The only way to get it where I want it looks like I need a FOMOCO gasket with a crush and bore of .024" and 3.75", respectively. With that gasket it gets me to 9.246, but I still have to shave the head to 50cc. Which I can live with. With this setup and my Schneider 256H cam, I'll have a 8.39 DCR. I think this will be alright with 92 octane, but what do you all think? Is 8.39 too high for a DD on 92 octane without worrying about heating issues or anything? If I change the chamber to 52cc, it puts me in the 9:1 SCR and 8.17 DCR. What is my best choice here?
I guess my final question now is, does anyone know of where I can get or have an old 200 FOMOCO gasket?
Thanks,
Ryan