Head flow numbers, which stock one is best
#3004194
01/11/22 04:26 PM
01/11/22 04:26 PM
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Joined: Aug 2003
Posts: 43,175 Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,175
Bend,OR USA
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I'm getting ready to start buying parts for a 6.1 or 6.4 Gen 3 Hemi build to use in my 1967 Satellite, which stock heads flow best? What do they flow stock and is it a good idea to buy them new from a car dealer? I've drag race Mopar on the street and track starting in 1964 with my mother's Dodge 270 4 door with one of the first 273 C.I. motor in SO CA back then The Gen 3 are not in my wheelhouse yet but your never too old to learn, huh I've made 920 HP with a 541 C.I. N/A B1 motors several years back with a single carb on a cast intake manifold, I've built lots of BB wedges and L.A. stroker pump gas motors but no Gen 3 yet All help appreciated: up:
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Head flow numbers, which stock one is best
[Re: Cab_Burge]
#3004226
01/11/22 05:28 PM
01/11/22 05:28 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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6.4 is best, There are two different materials used truck head and car head, the truck head is better but otherwise identical and you would probably never notice the difference. I would lump the 6.2 hell cat head in here as the ports and everything are the same but the intake bolt pattern is different to bolt the stupercharger onto.
6.1 and eagle 5.7 are very similar flow wise but I would take the smaller closed chamber of the 5.7 over the 6.1 head
The worst is the early 5.7 but they flow bone stock about what the best fully ported SB head flows
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Head flow numbers, which stock one is best
[Re: Cab_Burge]
#3004236
01/11/22 05:36 PM
01/11/22 05:36 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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I always buy mine used, they hardly show any wear and for max performance you would probably want to do your own VJ anyhow and maybe mill to your surface spec and chamber volume.
I don't see where you stated a HP goal but if that 920HP is any indication what you are after your gonna need a heavily ported 6.4 head, most pros are claiming in the ballpark of 400 CFM and a lot more low lift flow than a typical 400CFM wedge head.
A stock 6.4 SRT8 long block makes close to 580 HP with a proper intake manifold, carb and headers bolted on.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: Head flow numbers, which stock one is best
[Re: CSK]
#3004260
01/11/22 06:28 PM
01/11/22 06:28 PM
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Joined: Aug 2003
Posts: 43,175 Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,175
Bend,OR USA
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I'm not looking to build an all-out pump gas motor on my first attempt, if it makes 500+ HP on Oregon pump swill I'll probably be happy My stock T/A 392 is 485 NET flywheel HP factory rating , add headers & a tune & 500 net should be easy Thanks I'm thinking of starting to look for a used 6.2 or 6.4 junkyard motor in the spring, April or May I'm debating on which EFI brand and or controller to use also on what to use I have used Holey Sniper and Terminator EFI systems in the past, but no way do I know enough now to make a wise decision on this deal
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Head flow numbers, which stock one is best
[Re: Cab_Burge]
#3004263
01/11/22 06:31 PM
01/11/22 06:31 PM
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Joined: Aug 2011
Posts: 2,860 Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,860
Pattison Texas
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Holley has everything you need , have seen people use the HP efi, terminator uses the same HP ecu IIRC just a little different software
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Head flow numbers, which stock one is best
[Re: CSK]
#3005417
01/15/22 12:26 AM
01/15/22 12:26 AM
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Joined: Jul 2011
Posts: 781 wine country
8urvette
super stock
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super stock
Joined: Jul 2011
Posts: 781
wine country
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Holley has everything you need , have seen people use the HP efi, terminator uses the same HP ecu IIRC just a little different software be carefuel here, the terminator and HP use the same ecu, the terminator is not potted ecu (if this matters to you) . ALSO the BIG little detail, the terminator X is not the same as the terminator / HP. it is not nearly as good.
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Re: Head flow numbers, which stock one is best
[Re: 8urvette]
#3005710
01/15/22 07:42 PM
01/15/22 07:42 PM
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Joined: Jan 2005
Posts: 4,406 Michigan
MarkZ
Worthy
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Worthy
Joined: Jan 2005
Posts: 4,406
Michigan
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Holley makes an entire swap harness for this I think. Dylan used one on that roached out Challenger he put back together.
1987 Fifth Avenue - 512/518/D60
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