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Re: 915 and 516 CC's
[Re: JohnRR]
#1604282
04/07/14 11:22 AM
04/07/14 11:22 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
915's run about 84cc if I measured right , 516 ??? Do NOT use NHRA specs, they are smaller than actual.
I though they were like 78 
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Re: 915 and 516 CC's
[Re: Mr.Yuck]
#1604283
04/07/14 12:24 PM
04/07/14 12:24 PM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
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U.S.S.A.
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Quote:
Quote:
915's run about 84cc if I measured right , 516 ??? Do NOT use NHRA specs, they are smaller than actual.
I though they were like 78
That's the NHRA spec and it is WRONG
NHRA spec for 906 is 79.5 cc ... WRONG
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Re: 915 and 516 CC's
[Re: elmor353]
#1604286
04/07/14 02:26 PM
04/07/14 02:26 PM
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Joined: Oct 2007
Posts: 734
New York
R/T1968R/T
super stock
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super stock
Joined: Oct 2007
Posts: 734
New York
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Measured an NOS set of 915s and they measured 79ccs with new valves. 516s are usally about 83-84ccs
Last edited by R/T1968R/T; 04/07/14 02:27 PM.
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Re: 915 and 516 CC's
[Re: R/T1968R/T]
#1604287
04/07/14 03:34 PM
04/07/14 03:34 PM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
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Quote:
Measured an NOS set of 915s and they measured 79ccs with new valves.
Then you got lucky , 2 sets I have were both over 80 and I know one set was cut at least .015
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Re: 915 and 516 CC's
[Re: JohnRR]
#1604288
04/07/14 03:42 PM
04/07/14 03:42 PM
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Joined: Nov 2007
Posts: 426
Randolph, Ohio--N.E. Ohio
Goat330
mopar
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mopar
Joined: Nov 2007
Posts: 426
Randolph, Ohio--N.E. Ohio
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Quote:
Quote:
Quote:
915's run about 84cc if I measured right , 516 ??? Do NOT use NHRA specs, they are smaller than actual.
I though they were like 78
That's the NHRA spec and it is WRONG
NHRA spec for 906 is 79.5 cc ... WRONG
NHRA spec. has nothing to do with actual chamber volume on a stock head. It's the volume that you have to follow to build a legal stock class racer.If you're under their spec in CCs,then your car would be illegal.
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Re: 915 and 516 CC's
[Re: Goat330]
#1604289
04/07/14 07:31 PM
04/07/14 07:31 PM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
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Quote:
Quote:
Quote:
Quote:
915's run about 84cc if I measured right , 516 ??? Do NOT use NHRA specs, they are smaller than actual.
I though they were like 78
That's the NHRA spec and it is WRONG
NHRA spec for 906 is 79.5 cc ... WRONG
NHRA spec. has nothing to do with actual chamber volume on a stock head. It's the volume that you have to follow to build a legal stock class racer.If you're under their spec in CCs,then your car would be illegal.
Huh ???
NHRA spec , which I'm told is given to NHRA by Chrysler says that the combustion chamber volume of the 906 head is 79.5 cc , 906's out the door from Chrysler typically are 90 cc, I have had more than 1 pr at 92 cc ...
The op asked for 915/ 516 chamber , I have had 2 sets of 915's , neither were below 82cc, NHRA spec is lower than that.
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Re: 915 and 516 CC's
[Re: dogdays]
#1604291
04/07/14 07:57 PM
04/07/14 07:57 PM
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Joined: Feb 2005
Posts: 4,311
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,311
Prospect, PA
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Quote:
They typically measure out to 84cc, just like the Edelbrocks with a similar chamber.
R.
The chambers are really not that similar.
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Re: 915 and 516 CC's
[Re: BSB67]
#1604292
04/08/14 03:17 AM
04/08/14 03:17 AM
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Joined: Jan 2003
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JohnRR
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Quote:
I have 2 sets of 915s. They are 79 and 80.
Do you know if they have been cut ?
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Re: 915 and 516 CC's
[Re: JohnRR]
#1604293
04/08/14 08:46 AM
04/08/14 08:46 AM
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Joined: Feb 2005
Posts: 4,311
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,311
Prospect, PA
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Both sets are now cut. Thoses were measured originals. Since then, one has had a valve job and cleanup cut and the other new valves and a cleanup cut. Cuts were about 0.010". They now measure 77 and 78.
Last edited by BSB67; 04/08/14 08:50 AM.
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Re: 915 and 516 CC's
[Re: BSB67]
#1604294
04/08/14 01:43 PM
04/08/14 01:43 PM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
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Quote:
Both sets are now cut. Thoses were measured originals. Since then, one has had a valve job and cleanup cut and the other new valves and a cleanup cut. Cuts were about 0.010". They now measure 77 and 78.
Interesting .
Anyone know what ACTUAL piston to deck is on a 67 440 ? I'd like to do some math to determine actual compression ratio vs. claimed.
And no NHRA spec Deck to piston is not correct .
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Re: 915 and 516 CC's
[Re: titan]
#1604296
04/08/14 02:53 PM
04/08/14 02:53 PM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
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Quote:
Well I Just Rebuilt A Pair of '67 516's of of an never apart 383. new stainless valves,(1.74 Exhaust) & cut.010, and they measure out at 73cc
I just checked NHRA tech specs , 915 and 516 they are calling for 73.5 minimum CC .
Your heads are not legal now after .010 removal 
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Re: 915 and 516 CC's
[Re: JohnRR]
#1604297
04/08/14 08:55 PM
04/08/14 08:55 PM
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Joined: Feb 2005
Posts: 4,311
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
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Prospect, PA
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Quote:
Quote:
Both sets are now cut. Thoses were measured originals. Since then, one has had a valve job and cleanup cut and the other new valves and a cleanup cut. Cuts were about 0.010". They now measure 77 and 78.
Interesting .
Anyone know what ACTUAL piston to deck is on a 67 440 ? I'd like to do some math to determine actual compression ratio vs. claimed.
And no NHRA spec Deck to piston is not correct .
Piston CH is 2.002"
Distance below deck ranged from 0.073" to 0.086" Driver's side averaged 0.085", passenger side averaged 0.075". #2 rod was 0.003" longer than the rest. My notes say that the head gasket measured 0.022".
I just measured the lower cylinder bolt flange thickness: 0.989". So if you believe that it was 1.000" from the factory, it apprears I had 0.011" cut off, verses my estimate of 0.010".
As I think I have mentioned in the past, a decent rule of thumb is 2.00", 2.03", and 2.06" for 67, 68 and 6 pack pistons. They were about 0.080", 0.050", 0.020" below an uncut deck respectively.
Remember, a valve job will add 1 or 2cc to the chamber volume. A hack job could add 3 cc.
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Re: 915 and 516 CC's
[Re: BSB67]
#1604298
04/08/14 08:59 PM
04/08/14 08:59 PM
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Joined: Jun 2006
Posts: 5,161
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,161
CT
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Quote:
Quote:
Quote:
Both sets are now cut. Thoses were measured originals. Since then, one has had a valve job and cleanup cut and the other new valves and a cleanup cut. Cuts were about 0.010". They now measure 77 and 78.
Interesting .
Anyone know what ACTUAL piston to deck is on a 67 440 ? I'd like to do some math to determine actual compression ratio vs. claimed.
And no NHRA spec Deck to piston is not correct .
Piston CH is 2.002"
Distance below deck ranged from 0.073" to 0.086" Driver's side averaged 0.085", passenger side averaged 0.075". #2 rod was 0.003" longer than the rest. My notes say that the head gasket measured 0.022".
I just measured the lower cylinder bolt flange thickness: 0.989". So if you believe that it was 1.000" from the factory, it apprears I had 0.011" cut off, verses my estimate of 0.010".
As I think I have mentioned in the past, a decent rule of thumb is 2.00", 2.03", and 2.06" for 67, 68 and 6 pack pistons. They were about 0.080", 0.050", 0.020" below an uncut deck respectively.
Remember, a valve job will add 1 or 2cc to the chamber volume. A hack job could add 3 cc.
Good info 
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 915 and 516 CC's
[Re: GTX MATT]
#1604299
04/08/14 11:53 PM
04/08/14 11:53 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Quote:
Quote:
Quote:
Quote:
Remember, a valve job will add 1 or 2cc to the chamber volume. A hack job could add 3 cc.
Good info
Except for that part. I dont see a Valve job adding that much CC per cylinder. Totaled up maybe.
Your typical valve reliefs will add about 3cc to 5cc and the divots will look huge.
Touching the seats and the valves should add very little on a typical valve job. Maybe .2cc max probably less.
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