Re: Big Block Heads
[Re: jeebis44]
#2809347
08/15/20 11:59 PM
08/15/20 11:59 PM
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Joined: Aug 2011
Posts: 2,861 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,861
Pattison Texas
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It would be best to find out how far down the bore the piston is at TDC & then decide what head to use. Chances are you will want the smaller chamber
Last edited by csk; 08/16/20 12:00 AM.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Big Block Heads
[Re: jeebis44]
#2809455
08/16/20 12:01 PM
08/16/20 12:01 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
Posts: 4,220
West Plains, MO
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Anyone know the chamber volume on stock 516 heads from ‘66 4bbl 383? I cc'ed a 516 head once that had hardened exhaust seats and 1.74 valves installed. I seem to recall it was 78.5 cc (NHRA Blueprint spec from the Direct Connection book was much smaller, something like 73 or 73.5 cc). You need to measure the piston deck height and the head gasket thickness. That will tell you what head cc you need for a given compression ratio... what do you have now?
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Re: Big Block Heads
[Re: R/T1968R/T]
#2809730
08/17/20 12:06 PM
08/17/20 12:06 PM
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Joined: Aug 2003
Posts: 43,181 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,181
Bend,OR USA
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516 heads are approx. 84cc in factory form. 915 heads are approx. 79 ccs in factory form. you can still build a good quench motor with them. Me thinks those are Mopar furnished specs, not actual as produce sizes, I believe the 516 has smaller chambers than the one year only 915 heads had
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Big Block Heads
[Re: Cab_Burge]
#2809740
08/17/20 12:20 PM
08/17/20 12:20 PM
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Joined: Jan 2003
Posts: 14,499 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,499
So. Burlington, Vt.
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Questions about 516 chamber volumes always seem to generate numerous varying responses. I have cc’d a few pair of unmolested heads through the years. They were all close to 84cc. Were they all 84cc from the factory? I have no idea...... but the ones I checked were. There's no reason at all to throw pistonquench out the window and buy 84cc Edelbrock 'smog' heads. The 84 and 75 cc Ede heads are both closed chamber...... same quench using either.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Big Block Heads
[Re: BigBlockMopar]
#2809742
08/17/20 12:28 PM
08/17/20 12:28 PM
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Joined: Nov 2007
Posts: 21,825 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,825
Kirkland, Washington
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There's no reason at all to throw pistonquench out the window and buy 84cc Edelbrock 'smog' heads. Quench will be determined by piston depth in-the-hole and gasket thickness.
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