Head id
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From: Smith Mountain Lake
Head id
I bought a reman engine from advance auto. I also got a performer
400 non egr intake, the ports in the heads are 3/16 in larger than the intake ports. The head casting #D5AEA-A2A and 40 in the lower left corner and a M on the top right. Can some one check this number for me please. all help is appreciated!
Wayne
1979 f100 351m
400 non egr intake, the ports in the heads are 3/16 in larger than the intake ports. The head casting #D5AEA-A2A and 40 in the lower left corner and a M on the top right. Can some one check this number for me please. all help is appreciated!
Wayne
1979 f100 351m
Cross-Country
Joined: Aug 2000
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Head id
These are the same heads I have on my 400. They are open-chamber heads used from 75 and up, the chamber volume is 78cc. They are almost identical to the 2v cleveland heads, with the exception of the smog bump in the exhaust ports, but the bump can be ported out.
If you wanted to wake them up you could install 4v valves, and give it a good 3-angle valve job. Removing the smog bumps helps alot too.
Later
Riley
Lead Driver
Joined: Nov 2000
Posts: 6,636
Likes: 349
From: Albuquerque
Head id
If the ports in the heads are larger than the ports on the intake you will be OK. If it were the other way around you would have problems. This would be a good time to "port match" the intake. I'd use the steel valley pan for assembly but you could use a soft gasket as a guide to mark the intake. Make sure it's not bigger than the head or you would get the aforementioned problem. It would strip fuel out of the air stream.
Then again you might just leave it as is and you should not have a problem.
Bear Tracks
Then again you might just leave it as is and you should not have a problem.
Bear Tracks
Tuned
Joined: Jun 2001
Posts: 266
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Head id
>
>These are the same heads I have on my 400. They are
>open-chamber heads used from 75 and up, the chamber volume
>is 78cc. They are almost identical to the 2v cleveland
>heads, with the exception of the smog bump in the exhaust
>ports, but the bump can be ported out.
>
>If you wanted to wake them up you could install 4v valves,
>and give it a good 3-angle valve job. Removing the smog
>bumps helps alot too.
>
Larger valves would add high RPM power at the cost of low-end torque on a motor not known for revving. Unless you intend to build it for RPM's at the strip, stick with the small valves...
>These are the same heads I have on my 400. They are
>open-chamber heads used from 75 and up, the chamber volume
>is 78cc. They are almost identical to the 2v cleveland
>heads, with the exception of the smog bump in the exhaust
>ports, but the bump can be ported out.
>
>If you wanted to wake them up you could install 4v valves,
>and give it a good 3-angle valve job. Removing the smog
>bumps helps alot too.
>
Larger valves would add high RPM power at the cost of low-end torque on a motor not known for revving. Unless you intend to build it for RPM's at the strip, stick with the small valves...
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New User
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From: Smith Mountain Lake
Head id
Thanks guys for info!
But if these heads are for 351m/400 why
do i have to do port matching on the Eb perfomer 400 non egr intake?
Does any one make a intake that will match up to these heads?
Thanks
Wayne
1979 F100 351m\c6 stock
But if these heads are for 351m/400 whydo i have to do port matching on the Eb perfomer 400 non egr intake?
Does any one make a intake that will match up to these heads?
Thanks
Wayne
1979 F100 351m\c6 stock
Senior User
Joined: Jan 2002
Posts: 229
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Head id
basically all mass-roduced intake manifolds will have a mismatch to the intake orts, i think it's caused by something called 'core shift' ibn the casting process. even the factory intake should be ort matched for best erformance
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From: Porterfield
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Mountain Pass
Joined: Sep 2001
Posts: 102
Likes: 0
Head id
>>
>>These are the same heads I have on my 400. They are
>>open-chamber heads used from 75 and up, the chamber volume
>>is 78cc. They are almost identical to the 2v cleveland
>>heads, with the exception of the smog bump in the exhaust
>>ports, but the bump can be ported out.
>>
>>If you wanted to wake them up you could install 4v valves,
>>and give it a good 3-angle valve job. Removing the smog
>>bumps helps alot too.
>>
>
>Larger valves would add high RPM power at the cost of
>low-end torque on a motor not known for revving. Unless you
>intend to build it for RPM's at the strip, stick with the
>small valves...
Don't really agree with this point. Fuel/air velocity is whats needed for torque, which the smaller 2bbl passages do so well. Larger valves won't slow this down so much, hence you shoud'nt lose torque.
My 2cents
>>These are the same heads I have on my 400. They are
>>open-chamber heads used from 75 and up, the chamber volume
>>is 78cc. They are almost identical to the 2v cleveland
>>heads, with the exception of the smog bump in the exhaust
>>ports, but the bump can be ported out.
>>
>>If you wanted to wake them up you could install 4v valves,
>>and give it a good 3-angle valve job. Removing the smog
>>bumps helps alot too.
>>
>
>Larger valves would add high RPM power at the cost of
>low-end torque on a motor not known for revving. Unless you
>intend to build it for RPM's at the strip, stick with the
>small valves...
Don't really agree with this point. Fuel/air velocity is whats needed for torque, which the smaller 2bbl passages do so well. Larger valves won't slow this down so much, hence you shoud'nt lose torque.
My 2cents
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