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Cylinder Head Casting Numbers
 Chevrolet Big Block

CastingNumber 

Year 

ValveSizes 

HP 

Chamber 

Notes 
3856206  65-66  2.06/1.72  325  98 CC Chambers  396 
3856208  65  2.06/1.72  375 & 425  109 CC Chambers  Z-16/L-37 396 
3872702  66  2.06/1.72  325/360 & 390  98 CC Chambers  L-34/L-35/L-36 396/427 
3873858  66-67  2.06/1.72  375 & 425  109 CC Chambers  L-78/L-72 396/427 
3904390  66-67  2.06/1.72  325/350/390 & 400  98 CC Chambers  L-34/L-35/L-36/L-68 396/427 
3904391  65-67  2.06/1.72  375 & 425  107 CC Chambers  L-78/L-71/L-72 396/427 
3904392  67  2.19/1.88  430 & 435  107 CC Chambers  L-88/L89 Aluminum 427 
3909802  66-67  2.06/1.72  325-400  101 CC Chambers  L-34/L-35/L-36/L-68 396/427 
3917215  67-69  2.06/1.72  325-400  101 CC Chambers  L-34/L-35 396/427 
3919840  67-69  2.06/1.72  375 425 & 435  107 CC Chambers  COPO L-78/L-71/L-72 396/427 
3919842  68-69  2.19/1.88  375/430 & 435  107 CC Chambers  L-88/L-89 Aluminum 369/427 
3931063  69-70  2.06/1.72  325-400  101 cc Chambers  L-34/L-35 396/427 
3946074  69-71  2.19/1.88  375-465  118 CC  L-88/ZL-1/LS-6/LS-7 369/402/427/454 Aluminum 
3964280  69-70  2.06/1.72  325-400  101 CC  LS-5 396/402/427/454 
3964290  69-70  2.06/1.72  325-400  101 CC  LS-5 396/402/427/454 
Chevrolet Small Block

CastingNumber 

Year 

ValveSizes 

HP 

Chamber 

Notes 
333882  70-80  1.94/1.50  150-180 HP  76 CC Chambers  Intake flow 137.2 CFM Exhaust flow 95.4 CFM These are crack prone! 
340292  73-80  2.02/1.60  300HP & up  64cc Chambers.  High performance heads. hard to find. angle plugs. 
462624  76-87  1.94/1.50 & 2.02/1.60  Not listed  76 CC Chambers  These are crack prone! 
3782461  61-70  1.94/1.50 & 2.02/1.6  250-375  64 CC Chambers  No bolt holes These are the double humps. 
3890462  62-68  1.94/1.50 & 2.02/1.6  250-350  64 CC Chambers  No bolt holes These are also double humps. 
3917291  62-69  1.94/1.50 & 2.02/1.6  275-350  64 CC Chambers  No bolt holes These are doubble hump heads. 
3917292  67-68  2.02/1.60  350HP  64 CC Chambers  corvette heads. 
3927186  68-72  1.94/1.50 & 2.02/1.6  290-370  64 CC Chambers  has bolt holes These are the doubble humps as well. 
3932441  67-79  1.94/1.50  250 & 255  76 CC Chambers  Intake flow 152 CFM Exhaust flow 93.2 CFM These have flat seat spark plugs. 
3947040  68-70  1.94/1.50 & 2.02/1.6  290-370  64 CC    
3947041  68-70  1.94/1.50 & 2.02/1.6  290-370  64 CC    
3973414  64-70  2.02/1.6  360 & 370  64 CC  Z-28 & Corvette LT-1. 
3973487  68-79  1.94/1.50 & 2.02/1.6  165-330  76 CC  X casting has 10 more intake cc volume. 
3998993  68-79  1.72/1.50 & 1.94/1.50  115-175  76 CC  Intake flow 150.8 CFM Exhaust flow 91.1 CFM Heavy duty casting. Small plug. 
10088113  86 & up  1.94/1.50  N/A  57cc  Late model aluminum Vette heads. 

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