Open chamber is close to hemi head usually 2v
Closed chamber is similar to a wedge type head
used on 302's and the 351 4v heads..
2V = 2 barrell or ventury... 4V =4 barrell bigger valves
The 2v heads with 4v valves fitted "arguably" make more torque
and better street heads..There are tongues that can be bought now to help velocity at lower revs....
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..