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771 BBC HEADS

 
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JLL
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Joined: 02 Jan 2012
Posts: 5
Location: MADISON NC
276.54 points



PostPosted: Mon Jan 02, 2012 9:11 pm    Post subject: 771 BBC HEADS Reply with quote

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
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af2
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Joined: 01 Sep 2003
Posts: 5393
Location: grassvalley, ca
66344.46 points


1933 Willys Coupe

PostPosted: Mon Jan 02, 2012 9:57 pm    Post subject: Re: 771 BBC HEADS Reply with quote

JLL wrote:
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


What are you wanting to do using the Tiny heads?
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clay
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Joined: 24 Nov 2002
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Mon Jan 02, 2012 9:58 pm    Post subject: Reply with quote

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.
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JLL
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Joined: 02 Jan 2012
Posts: 5
Location: MADISON NC
276.54 points



PostPosted: Mon Jan 02, 2012 10:37 pm    Post subject: Re: 771 BBC HEADS Reply with quote

af2 wrote:
JLL wrote:
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


What are you wanting to do using the Tiny heads?
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af2
Member


Joined: 01 Sep 2003
Posts: 5393
Location: grassvalley, ca
66344.46 points


1933 Willys Coupe

PostPosted: Mon Jan 02, 2012 11:03 pm    Post subject: Re: 771 BBC HEADS Reply with quote

JLL wrote:
af2 wrote:
JLL wrote:
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


What are you wanting to do using the Tiny heads?



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Big Dave
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Joined: 04 Dec 2005
Posts: 2540
Location: Tampa Florida
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PostPosted: Tue Jan 03, 2012 7:12 pm    Post subject: Reply with quote

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
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Wed Jan 04, 2012 11:47 am    Post subject: Reply with quote

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

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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
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PostPosted: Wed Jan 04, 2012 7:29 pm    Post subject: Reply with quote

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


The tall deck block needs a wider intake (or use a passenger car intake and some spacers), but the heads will interchange back and forth between any Mark IV engine. Only advantage of the head is it is cast out of high nickel grey iron and it has a thicker deck than a standard car head does (nothing to compare with an aftermarket head but enough to drop the combustion chamber volume a smidge).

Big Dave
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