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Re: 906 heads question
[Re: 70VcodeCoronetRT]
#1593851
03/19/14 05:15 PM
03/19/14 05:15 PM
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Posts: 75,125
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JohnRR
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Maybe I'm better off just using Stealth heads? Better quench, flow a bit better and can run a bit higher compression. What do you guys think? I still want to use my factory cast iron intake though.
You would be better off with a closed chamber head or a piston like I posted above at minimum. Stealths would be better than 906's flow wise for sure , don't plan on running them out of the box, I'd swap that iron intake for an alum one , that iron intake is a boat anchor ... painted it will look just like the iron one .
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Re: 906 heads question
[Re: JohnRR]
#1593855
03/20/14 05:58 AM
03/20/14 05:58 AM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
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Aurora, Colorado
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This build is on a factory Six Pack motor. And I want to use the factory 906 heads. This is going to be a Mr. Six Pack cam build. So basically a stock build. I might just end up going with a flattop 0 deck setup with 9.5-1 compression. This is suppose to be ok with 906 heads and no quench. But it will be down a little on HP.
Your still gonna have a head gasket so thats your
quench
Not with an open chamber head he won't any quench unless he has a custom piston made.
Here is a piston I had made to have quench and keep the compression in the 9.5 range with an open chamber head.
Those are nice looking pistons!
The Stealth and Edelbrock RPM heads are "closed chamber", but the flat quench area is not that large. Custom pistons like these would get you almost the same quench area. The Victor, and B1 heads have much larger closed (quench) area.
The advertised compression ratio was way off. If you check the real compression ratio of the high compression 440's they were never 10:1 compression.
If you need the engine to look stock, use the 906 heads and put money and hours into them if you want them to flow like inexpensive aftermarket heads.
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Re: 906 heads question
[Re: Thumperdart]
#1593856
03/20/14 03:08 PM
03/20/14 03:08 PM
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Posts: 75,125
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JohnRR
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The alum. would be better but now the stock intake could be the restriction or choke point............... 
Not really , F.A.S.T. racers have gone well into the 11's with one.
Didn`t realize he had the 6-pac set up........... 
Pretty sure Ed Cook went 10.9X ... Intake work ??
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Re: 906 heads question
[Re: 451Mopar]
#1593857
03/20/14 03:11 PM
03/20/14 03:11 PM
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JohnRR
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The Stealth and Edelbrock RPM heads are "closed chamber", but the flat quench area is not that large. Custom pistons like these would get you almost the same quench area. The Victor, and B1 heads have much larger closed (quench) area.
I have a pair of the 383/440 replacement alum heads , Stage VI's with the stock port location instead of raised , they have a nice heart shaped combustion chamber like a Stage VI and they sort of look like a stock head on the outside , I was thinking of machining the tapped core plug on one end of the head that would be seen for a std. freeze plug.
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Re: 906 heads question
[Re: lewtot184]
#1593858
03/20/14 03:14 PM
03/20/14 03:14 PM
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Joined: Jan 2003
Posts: 75,125
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JohnRR
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stock type rebuild? '906 heads? just do a kb184 and be done with it. keep it simple.
I was going that route before having that piston made , it's a horrible piston choice , the step is way to short, unless you don't mind not have proper quench distance. If you don't care then there is no need to use that piston.
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