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Big Block

BB Head Flow Chart

BB Head Flow Chart

Table 1 - Big block Mopar heads flow chart

	Lift	.100"	.200"	.300"	.400"	.500"	.550"	.600"	.650"	.700"	.750"	.800"	Flow depression
B1-BS(A)	Intake	66.3	121.7	167.1	212.9	254.5	270.5	284.9	293.7	293.7			28" H2O
	Exhaust												28" H2O
Indy SR(A)	Intake	66.8	131.7	189.0	238.5	273.7	284.9	289.7	291.3	292.9			28" H2O
	Exhaust												28" H2O
Stage VI(A)	Intake	73.0	151.7	212.0	246.5	256.1	260.9	264.1	267.3	268.9			28" H2O
	Exhaust												28" H2O
B1-BS(B)	Intake	68.9	143.4	199.8	251.3	293.3	311.2	321.9	321.9	320.0			28" H2O
	Exhaust												28" H2O
Indy SR(B)	Intake	66.9	131.6	190.1	224.0	284.9	312.8	325.4	327.2	327.2			28" H2O
	Exhaust												28" H2O
Stage VI(B)	Intake	72.9	151.6	215.5	268.8	307.5	311.2	311.2	312.8	316.5			28" H2O
	Exhaust												28" H2O
Stage VI (1)	Intake	68.5	143.9	205.3	252.1	287.7	300.2	304.2	306.9	309.2			28" H2O
	Exhaust	54.7	104.1	154.2	191.4	220.1	230.7	240.1	247.3	253.3			28" H2O
Edelbrock	Intake	79	145	209	254	278		290		292			28" H2O
	Exhaust	70	126	160	188	206		217		223			28" H2O
Mopar Performance Stage IV	Intake				257.68	277.51		289.37		291.35	292.00		Unknown-presumed 28" H2O
	Exhaust				181.05	194.4		207.65		214.73			Unknown-presumed 28" H2O
B1-Moved Centerline	Intake	92.86	174.91	251.16	324.00	371.70		405.00		429.75		441.00	28" H2O
	Exhaust	72.57	133.30	175.28	219.10	250.40		272.31		287.96		297.35	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

Author Topic: BB intake flow comparo
fast68plymouth
Moparts Member

From: so burlington,vt usa

--------------------------------------------------------------------------------
here is a little flow info for those interested. all tests performed by me on the same flow bench. flow @28", intake ports only:
B1-BS(A)- this is how the head came from koffels. 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 me, valve job and very mild bowl blend only, no chamber work

lift...BS(A)..SR(A)..VI(A)
.100...66.3...66.8...73.0
.200..121.7..131.7..151.7
.300..167.1..189.0..212.0
.400..212.9..238.5..246.5
.500..254.5..273.7..256.1
.550..270.5..284.9..260.9
.600..284.9..289.7..264.1
.650..293.7..291.3..267.3
.700..293.7..292.9..268.9

as you can see, the B1 head has the most high lift flow, but is really soft at the lower lifts as delivered out of the box. IMO, this isnt flow you want to give up.

these next numbers are for a basic "full port" job, including full chamber port on the BS and Stage VI, but not on the SR. the Stage VI head has had the intake valve diameter enlarged to 2.18.

lift...BS(B)..SR(B)..VI(B)
.100...68.9...66.9...72.9
.200..143.4..131.6..151.6
.300..199.8..190.1..215.5
.400..251.3..224.0..243.3
.500..293.3..284.9..276.9
.550..311.2..312.8..311.2
.600..321.9..325.4..312.8
.650..321.9..327.2..312.8
.700..320.0..327.2..316.5

anyway, just some numbers to look at

UPDATE

flowed bt Porter Racing Heads /Dwayne Porter aka fast68plymouth

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