771 BBC HEADS

JLL · Posted: Mon Jan 02, 2012 9:11 pm Post subject: 771 BBC HEADS

Has anyone,info on 771 BBC heads these heads are OC and only 72 cc have checked over and over still 72 cc with 1.840 IV and 1.640 EV any help appreaciated.
thanks

af2 · Posted: Mon Jan 02, 2012 9:57 pm Post subject: Re: 771 BBC HEADS

clay · Posted: Mon Jan 02, 2012 9:58 pm Post subject:

Everything I found on the net places them around the 113cc range. I did see a set that had been milled to 98cc which is a pretty good cut. 72cc is really strange. I don't mess with BBC stuff much so I don't really know what to tell you. Sorry, Clay.

JLL · Posted: Mon Jan 02, 2012 10:37 pm Post subject: Re: 771 BBC HEADS

af2 · Posted: Mon Jan 02, 2012 11:03 pm Post subject: Re: 771 BBC HEADS

Big Dave · Posted: Tue Jan 03, 2012 7:12 pm Post subject:

Big block head casting number 343771 where used on top of 1968-85 366/427/454 tall deck truck motors. They have an open combuston chamber that has 113 cc's. They have flat bottomed small valves (2.07"/1.72") and hardened seats. They are peanut port heads. They are called that because the have the smallest intake port of any of the big block heads cast, ever.

A normal passenger car open chamber head measures anywhere from 119 to 123 cc depending upon the head casting. The only big block head with a 72 cc combustion chamber will be an old set of 16 degree Dart or Brodix heads. Today those same chambers are down to 58 to 62 cc combustion chambers with valve angles down to 12 degrees.

Big Dave

squeeezer · Posted: Wed Jan 04, 2012 11:47 am Post subject:

i may be wrong
but tall deck heads need a specific intake v.s. normal deck?

Big Dave · Posted: Wed Jan 04, 2012 7:29 pm Post subject: