http://www.airflowresearch.com/bbc-375cc-c-1_109.html
AFR 375cc Fully CNC Ported Magnum BBC Cylinder Heads
Coming Soon - September 2009!
AFR’s Magnum Series
BBC 375cc Fully CNC ported Cylinder Heads
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As the aftermarket continues to push larger displacement combinations, even 555 CID BBC’s are becoming commonplace with 600+ CID engines more plentiful than ever before. AFR is proud to announce our answer to that with our all new 375 cc Magnum….the largest and highest flowing BBC product in our line-up with flow numbers that are creeping up on many of our competitor’s 18 degree Pro-stock style heads. If you’ve got the displacement we have the head to feed it with an intake port that flirts with 440 CFM at a usable lift-point, and enough complimenting exhaust flow to still maintain over 75% of that number @ .800 lift (335 CFM’s at .800 lift!). While this huge a runner is more clearly aimed at 572 – 632 CID applications, in a light car it could still be considered in 555-565 CID aggressive builds that are built to reliably turn 7800 – 8500 RPM’s (Ti valves recommended over 8000 RPM’s). This head will be best utilized with camshafts in the .780 - .850 range to take full advantage of its impressive higher lift airflow, but the best thing about this head is its ability to also provide the end user with industry leading low and mid-lift flow as well (400+ CFM at .600 lift!). This head of course comes with AFR’s trademark .750 thick head deck, reinforced rocker stud bosses, and is equipped with 2.350 intake / 1.880 tulip exhaust valves. Properly selecting the right cylinder head depends on a large number of variables. Please consult with one of our sales technicians to assist you in making the best choice for your particular application.
mark iv blocks
mark v blocks
(keep in mind that ALL '91 and later Gen.V and Gen.VI big blocks come with 4-bolt main caps. The two-bolt big blocks are no longer in production
MANY BUT NOT ALL aftermarket head designs have been modified to work on both the early MARK IV 1965-90 and later MARK V & VI blocks 1991-later.)
BTW, , on BIG BLOCKS the oil pumps and oil filter adapters are different due to the block oil filter recess and rear seals being different
GEN 4 or MARK IV
GEN V and VI
Note:
Optional stud girdle required for 2° rolled valve angles and 1†longer head bolts needed on four bottom exhaust bolt holes. Longer pushrods might also be required.(see footnotes here)