Also the closed chamber heads have small combustion chambers. Thus the term closed chamber. those are the ones you want. Oh another thing, in case you really lucked out. Are the rocker arm studs press in or are they threaded for screw in studs. If you have threaded ones you might have a set of BOSS heads. Also be careful, Boss302 heads look very similar to Cleveland heads. What are the casting numbers. Thats the only way to be really sure
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1970 Stang Conv:
en:Boss351 (balanced/blueprinted)
mech cam(240*@.050/.540 lift)
Scrw in studs/comp cams rllr rkr
Mldn valves 2.19in 1.71ex
ported polished cc'd hrdnd ex
Keith Black FT pistons(10.25/1)
Weiand Excellorator manifold
Holley700 DP mech 2nds
MSD 6 box and Dis
Headers/2 1/2 inch duels
tr: modified FMX
re:9-inch/3.89 limited slip
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