posted February 28, 2002 06:05 PM I have a 400 Chevy S.B. being turned to a 406 for Street Stock/Sportsman use. The heads are cracked. Was told that i could use my 882 (350) heads on this block; only needed to drill steam holes. Is this true? Is there a power difference? Or any info on good used 400 heads?
RangeRover Dirt Maniac
Total posts: 174
posted February 28, 2002 06:41 PM
Your 350 heads will work just fine for racing without having to drill for the steam holes. It is when the 400 will see city traffic use that the steam holes should be drilled into the head.
hoosierdaddy Dirt Full Roller
Total posts: 58
posted February 28, 2002 08:10 PM
before you run the 350 heads on a 400 you need to drill out the holes for the water jackets inbetween the cyllinders.
EVANSRACING24E Dirt Forum Racer
Total posts: 80
posted February 28, 2002 08:51 PM
YOU DO NOT NEED TO DRILL ANY HOLES ON THE HEADS NO MATTER WHAT FOR STREET OR RACE. THE HEADS DO JUST FINE WITHOUT THEM.I HAVE RAN 400'S FOR 15 YRS. ON THE STREET AND RACE AND HAVE NOT HAD A PROBLEM WITHOUT THE STEAM HOLES. JUST USE THE 350 HEAD GASKETS TO HELP SEAL THE BLOCKS HOLES.
LUBEGUY07 Dirt Maniac
Total posts: 156
posted March 03, 2002 10:08 PM
Ok there right there is no need to drill the holes in the head just use a 350 head gasket, we have been using 400 with 350 heads for several years with no trouble. If it was me i would worry about the 882 heads they crack very easy becouse of the double heat passages in the center exshaust ports.But the 882 are better than the 624 if u look at them they will crack, that is the newer 624's