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HEMI Technical Info

Mopar B/RB - Heads

B1
Intake Seats: 2.2"(stock), 2.4,
Exhaust Seats: 1.900", 1.94 (stock), 2.00
Chamber Volume: cc (stock)


Top - B1 bottom - Stage 6
Raised and greatly enlarged Intake and exhaust ports
stock bolt configuration.

Indy  

Brodix  

MOPAR The Chrysler Big Block began life in 1958 and lived until 1978.
The 1958-1962 cylinder heads had a 4-bolt valve cover (even the Max Wedge).
From 1963-1978, 6-bolt valve cover.
Industrial engines had a water port at the end of the head and a 3/4-inch spacer cast into the bottom of the head. This allow for very low compression, thus low heat.
Most heads from 1958-1966 had small valves and were closed chambered (except special pieces like the Max Wedge or 300J).
The rare 1967 pieces were large valve, but closed chambered. From 1968-1978 were large valve, but were an open chamber design.
Intake Seats: 1.95 - 2.08 (stock)
Exhaust Seats: 1.74 - 1.88 (stock)
Chamber Volume: 75 - 96 cc (stock)
 
Part Numbers Description   Intake Valve Dia. Exhaust Valve Dia.
3614476 MOPAR Stage IV   2.08" 1.74"
P4286526 MOPAR Stage V   2.08" 1.74"
XXXXXXX MOPAR Stage VI   2.14" 1.81"
Note intake Dimensions Std = 2.17 x 1.13 MW (max wedge) = 2.58 x 1.35

 

Stock Castings      
Casting Numbers Application Intake Valve Dia. Exhaust Valve Dia.
4021051 '77-86 360 1.88" 1.60"
1737637 '58-'59 361 cid 1.94" 1.60"
1944705 '58-'59 361 cid 1.94" 1.60"
1737637 '60 383 cid 1.94" 1.60"
2206324 '60-'62 361-383-413 cid 1.94" 1.60"
2206924 '60-'62 361-383-413 cid 1.94" 1.60"
2463200 1963 361-383-413 cid 2.08" 1.60"
2408520 '64 413 2.08" 1.60"
2402557 '63 413 - 300J 2.08 1.74
2402286 1962 413 Max Wedge 2.08" 1.88"
2463209 1963 426 Max Wedge 2.08" 1.88"
2406516 '64-'67 361-383-413-426 cid 2.08" 1.60"
2406518 1964 426 Max Wedge 2.08" 1.88"
2406158 1967 440 LP 2.08" 1.60"
2780915 1967 383-440 2.08" 1.60"
2780915 1967 440 HP 2.08" 1.74"
2843906 '68-'70 383-440 cid 2.08" 1.74"
2951250 '68 440 2.08" 1.74"
3462346 '71-'72 383-400-440 cid 2.08" 1.74"
3462346 '73 400-440 cid 2.08" 1.74"
3462345 '72-'73 400-440 "Emission" 2.08" 1.74"
3751213 1973 400-440 "Motor Home" 2.08" 1.74"
3769902 1974 400-440 cid 2.08" 1.74"
3769975 1975 400-440 cid 2.08" 1.74"
4006452 '76-'78 400-440 cid 2.08" 1.74"
       
 
Flow Comparison
    .100 .200 .300" .400" .500" .550" .600" .650" .700" .750" .800" Flow-@
B1-
BS(A)		 I 66.3 121.7 167.1 212.9 254.5 270.5 284.9 293.7 293.7     28" H2O
E                       28" H2O
Indy
SR(A)		 I 66.8 131.7 189.0 238.5 273.7 284.9 289.7 291.3 292.9     28" H2O
E                       28" H2O
Stage
VI(A)		 I 73.0 151.7 212.0 246.5 256.1 260.9 264.1 267.3 268.9     28" H2O
E                       28" H2O
B1-
BS(B)		 I 68.9 143.4 199.8 251.3 293.3 311.2 321.9 321.9 320.0     28" H2O
E                       28" H2O
Indy
SR(B)		 I 66.9 131.6 190.1 224.0 284.9 312.8 325.4 327.2 327.2     28" H2O
E                       28" H2O
Stage
VI(B)		 I 72.9 151.6 215.5 268.8 307.5 311.2 311.2 312.8 316.5     28" H2O
E                       28" H2O
Stage
VI (1)		 I 68.5 143.9 205.3 252.1 287.7 300.2 304.2 306.9 309.2     28" H2O
E 54.7 104.1 154.2 191.4 220.1 230.7 240.1 247.3 253.3     28" H2O
Edelb
rock		 I 79 145 209 254 278   290   292     28" H2O
E 70 126 160 188 206   217   223     28" H2O
Mopar
S IV		 I       257.6 277.5   289.3   291.3 292.0    
E       181.0 194.4   207.6   214.7      
B1-
Moved
Center
line		 I 92.8 174.9 251.1 324.0 371.7   405.0   429.7   441.0 28" H2O
E 72.5 133.3 175.2 219.1 250.4   272.3   287.9   297.3 28" H2O
B1-BS(A) - This is how the head came from Koffels Place. Bowls blended, and intake ports gasket matched. No chamber work.
Indy SR(A) - This is how these came from Indy, no porting at all, no chamber work
Stage VI(A ) - Bare heads prepped by Dwayne Porter, valve job and very mild bowl blend only, no chamber work
B1-BS(B) - Basic "full port" job, including full chamber port by Dwayne Porter, 2.20" intake valve, 1.81" exhaust
Indy SR(B) - Basic "full port" job, no chamber work by Dwayne Porter, 2.18" intake valve, 1.81" exhaust
Stage VI(B) - Basic "full port" job, including full chamber port by Dwayne Porter, 2.18" intake valve, 1.81" exhaust
Stage VI (1) - Basic "full port" job, including full chamber port by Dwayne Porter, 2.14" intake valve, 1.81" exhaust
Edelbrock - Published numbers by Edelbrock
B1-Moved Centerline - CNC full porting including combustion chambers, 2.4" intake valve, 1.78" exhaust valve, 351 cc intake port, 125 cc exhaust port

 
 
 

Rocker arm  

stock offset

 59-78 "B" & "RB" 350-440
Edlebrock Performer RPM
Indy SR
  Stage IV, V, VI - .450 offset intake rockers.
Brodix B1, B1-BS - .485 offset intake rockers.
Edlebrock Victor - .650 offset intake rockers.
Indy 440-1 Heads - .800 offset intake rockers