by Dr. Radut

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