[dre1984]

I have a set of bbc bowtie aluminum heads casting number 12363390 came of a zz502 and now going on a 468 and wondering does anyone know the flow number on these heads

 

[dre1984]

My goal is to put them on a 468 8.7.1 compression and a b&m 177 blower with a 1050 dominator havent pick out a cam yet street and strip only 4,000lbs car

 

[vinniekq2]

Numbers are at 28" of of a SF600 Bench. This is flowed with a 4.500" fixture. Intake had radius fixture and exhaust is with 1 7/8" pipe.

GM #12363390 Alum Oval Port Head-stock
Intake Valve 2.250 " Exhaust Valve 1.800 "
Lift: inches Flow: cfm Lift:inches Flow: cfm
0.100 74.0 0.100 71.0
0.200 143.0 0.200 126.0
0.300 207.0 0.300 158.0
0.400 250.0 0.400 178.0
0.500 284.0 0.500 200.0
0.600 309.0 0.600 218.0
0.700 322.0 0.700 232.0
0.800 0.800

GM #12363390 Alum Oval Port Head-ported
Intake Valve 2.250 " Exhaust Valve 1.800 "
Lift: inches Flow: cfm Lift:inches Flow: cfm
0.100 85.0 0.100 73.0
0.200 161.0 0.200 141.0
0.300 230.0 0.300 175.0
0.400 283.0 0.400 208.0
0.500 332.0 0.500 234.0
0.600 354.0 0.600 257.0
0.700 361.0 0.700 274.0
0.800 363.0 0.800 287.0

 

[vinniekq2]

if these flow numbers are accurate then a blown engine with these heads could produce up to 1,000 hp

 

[dre1984]

Ok and thanks those numbers look good now all I have to do is find a cam next

 

[vinniekq2]

Have fun.Just remember those flow numbers are with a 4 1/2 inch bore,your numbers will be a little lower with 4 1/4 bore.
No reason you couldnt port them,especially on the exhaust side for your application.