273????

custom100 said

Wow thinks guys this is a lot of information and it has helped me to deside to do the 273 and pass on the 340 (for now).

Now I have another question if I'm reading correctly the valve size was the same for the regular 273 and the 273 comando? Would there be any improvement in going to larger valves and is there room?

Austin

Click to expand...

You can take a 1.88 and cut it down to 1.84 without worrying about shrouding, same on the exhaust valve. With a little bowl blending you can get that 273 flowing just as good as the 302, maybe better. My heads flowed at 167 cfm @ .500 of lift, 116% max velocity. More than enough for a street 273.

Remember that you can bump up your cr with 8.8 cr by milling the heads and using a thinner gasket. Good enough for a street motor.