Flow Rates
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,574
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From: Cranbrook, Ont., Canada
Flow Rates
Hi Gang. Would anyone know the flow rate of 1977 stock cast iron open chamber 2V 400 heads. Even a site that I could go to and run it down. Need to know for a computer Horsepower/torque estimate.
Senior User
Joined: Mar 2008
Posts: 149
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2V Flow rates
Here are two references that I could dig up:
Stan Weiss' - Cylinder Head Flow Data at 28 Inches of Water -- DFW / FLW Flow Files for use with Engine Simulation Software
Flow Test Small-Block Engine Heads - Mustang & Fords Magazine Photo & Image Gallery
Stan Weiss' - Cylinder Head Flow Data at 28 Inches of Water -- DFW / FLW Flow Files for use with Engine Simulation Software
Flow Test Small-Block Engine Heads - Mustang & Fords Magazine Photo & Image Gallery
Laughing Gas
Joined: Sep 2013
Posts: 1,118
Likes: 103
From: North Idaho
I just got some information on my heads - D5AE for my 78 Bronco.
I would say they have a "moderate" home porting job, Ferrea 2.070" intake and 1.650" exhaust valves. The heads got a 3 angle valve job but because of narrow margins on the valves they didn't want to do a 3 angle on the valves. I will do a little more clean-up, but here is a base for a "moderate" home ported head...
Intake
Lift - CFM
.100 - 89
.200 - 132.2
.300 - 194.7
.400 - 215.4
.500 - 221.3
.600 - 221.3
Exhaust
Lift - CFM
.100 - 53.2
.200 - 97.6
.300 - 134.6
.400 - 168.5
.500 - 181.2
.600 - 184.4
They knew my valve lift was going to be less than .600" so they quit there. Looks like they were finished by that lift anyway.
I would say they have a "moderate" home porting job, Ferrea 2.070" intake and 1.650" exhaust valves. The heads got a 3 angle valve job but because of narrow margins on the valves they didn't want to do a 3 angle on the valves. I will do a little more clean-up, but here is a base for a "moderate" home ported head...
Intake
Lift - CFM
.100 - 89
.200 - 132.2
.300 - 194.7
.400 - 215.4
.500 - 221.3
.600 - 221.3
Exhaust
Lift - CFM
.100 - 53.2
.200 - 97.6
.300 - 134.6
.400 - 168.5
.500 - 181.2
.600 - 184.4
They knew my valve lift was going to be less than .600" so they quit there. Looks like they were finished by that lift anyway.
Last edited by SDDL-UP; Jul 17, 2014 at 09:29 AM. Reason: exhaust is 1.650" - not 1.770"
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
. Were these '78 heads? What kind of constriction did you run into in the intake ports? Especially in the bowl area? Are there air reactor bosses in the exhaust ports like the ones blocking up 351W heads?
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Fleet Mechanic
Joined: Aug 2010
Posts: 1,574
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From: Cranbrook, Ont., Canada
Thanks SDDL-UP. I spent a LOT of time on the exhaust ports to. Removing the "smog bumps" and gasket matching the port its self. I gasket matched the intake a little but pretty much left it alone. The cam I am using is a Comp roller grind with a .513/.513 lift @ .050, 224/230 duration and a 110 LSA and Crane GOLD roller rockers with a 1:73 ratio. I am hoping to get this put in by the fall. I still have to do the tranny AND the rear gears (3:70). If my Dad was still alive I KNOW he would be shaking his head and asking WTF are you doing????. lol I am 64 This September. What are your plans for your engine?
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Laughing Gas
Joined: Sep 2013
Posts: 1,118
Likes: 103
From: North Idaho
BuzzLOL - yes, these are the factory 1978 cylinder head. I removed the themactor bumps and did some trimming of the huge plateau around the exhaust valve that contains the water jacket on later model heads. The intakes are pretty good, but I did a bowl blend, tapered the valve guides a bit, rounded in front and tapered like a football in back, then opened up the intake side to very near gasket dimensions.
POPAJON - my plans for this engine are to put back in the original vehicle, a 1978 Bronco. My camshaft is a Howard's roller - 217/225 @ .050" lift and .571/.577 lift - grind no. 233215-10. I should be solidly in the 375 to 400 HP range which is why I will be driving the Bronco and not my 15 year old son, at least not yet!
POPAJON - my plans for this engine are to put back in the original vehicle, a 1978 Bronco. My camshaft is a Howard's roller - 217/225 @ .050" lift and .571/.577 lift - grind no. 233215-10. I should be solidly in the 375 to 400 HP range which is why I will be driving the Bronco and not my 15 year old son, at least not yet!
Posting Guru
Joined: Nov 2008
Posts: 1,937
Likes: 2
From: wyoming
351 Cleveland 4v heads
Had some 4v heads worked bowl work and smoothed.520 lift was flowing 280 cfm@28" through worked air gap intake. Made sure all flow numbers checked through intake manifold. Air gap intake needed lots of work to get flowing evenly at all ports. Did fill the lower part of port to fix the dead spot on btm of port. My roller cam is.520 lift 4wd perf towing application. Have a good day.
Posting Guru
Joined: Nov 2008
Posts: 1,937
Likes: 2
From: wyoming
Intake?
Curious on intake? Did you flow head only? I lost up to 20 cfm at different ports when flowed thee intake. I wanted even flow to prevent a lean condition at a cylinder. Detonation prevention 101! Have a good day.
Laughing Gas
Joined: Sep 2013
Posts: 1,118
Likes: 103
From: North Idaho
Wyoming4x4,
Yes the head only was flowed. I actually didn't even request it, but the guy that did the valve job does lots of head work and must have been curious. I will have them flowed at another shop right before engine assembly. There is still a little work to do and I should probably try working the intake short side turn, I haven't touched that.
Intake will be an Edelbrock Performer 400 I picked up used for cheap! I'll do a little work there just to make sure ports are lined up after I can bolt everything together.
I know there is quite a bit of room to improve the intake side, if I could gain another 20CFM or so I'd be thrilled.
Thanks for the tip on the annular discharge carbs.
There's certainly more performance in the "boat anchor" head than head than people would think!
Yes the head only was flowed. I actually didn't even request it, but the guy that did the valve job does lots of head work and must have been curious. I will have them flowed at another shop right before engine assembly. There is still a little work to do and I should probably try working the intake short side turn, I haven't touched that.
Intake will be an Edelbrock Performer 400 I picked up used for cheap! I'll do a little work there just to make sure ports are lined up after I can bolt everything together.
I know there is quite a bit of room to improve the intake side, if I could gain another 20CFM or so I'd be thrilled.
Thanks for the tip on the annular discharge carbs.
There's certainly more performance in the "boat anchor" head than head than people would think!
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