whats the chamber volume of open 2v with 4v valves if it makes a difference

the chamber volume shouldnt change if its just the valves

I assume you mean open chamber 2v head compared to closed chamber 4v head..Btw the V is for ventury NOT valve...As in carb 2 barrel is 2 v as in two venturies...

number identifying the head is found on the deck side.



Head Chamber Port
size Intake
valve Exhaust
valve Application

Two barrel
(2V) Open
76.9-79.9cc
74.7-77.7cc Small 2.05" 1.65" 1970/ 351C-2V, 351M, 400
Four barrel
(4V) Closed
61.3-64.3cc Large 2.19" 1.71" 1970/71 351C-4V
D0AE-G, -M, -N, -R, D1AE-GA
Boss 351 Closed
64.6-67.6cc Large 2.19" 1.71" 1971 Boss 351
D1ZE-B
351 CJ Open
73.9-76.9cc Large 2.19" (71/72)
2.05" (73/74) 1.71" (71/72)
1.65" (73/74) 1971 351 CJ
1972/74 351C-4V
351 HO Open
73.9-76.9cc Large 2.19" 1.71" 1972/73 351 HO
D2ZE-A
Boss 302 Closed
61.3-64.3cc Large 2.23" 1.71" 1969 Boss 302
C9ZE-A, -B
Boss 302 Closed
57.0-60.0cc Large 2.19" 1.71" 1970 Boss 302, D0ZE-A, -B
Service replacement D1ZE-A
Australian
302C-2V Closed
56.4-59.4cc Small 2.05" 1.65" 1972/83 Australian 302C-2V
Australian
351C-2V Open
76.8-79.8cc Small 2.05" 1.65" 1972/73 Australian 351C-2V
Australian
351C-2V Open
72.2-75.2cc Small 2.05" 1.65" 1976/83 Australian 351C-2V
Australian
351C-4V Closed
64.6-67.6cc Large 2.19" 1.71" 1972/73 Australian 351C-4V


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Enough info ???

yep quite sufficient thanks