FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: winr1 on May 25, 2017, 01:40:26 AM
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With the bowls opened up to match the CJ valves and cleaned up as well
Are the ports ok as they are for a 418 ??
A bit under 10 to 1, under 500 lift cam
3.70 gear, 3500 lb 65 F100
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Another question:
C8/D2 heads, stock size valves, how much gain with:
Cleaned up bowls only
Cleaned up bowls and cleaned up ports
Ricky.
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http://www.network54.com/Forum/74182/message/1346284182/PICS+ADDED+-+Got+a+set+of+
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So those are my heads and they really run well. Setup is currently a 445 @ 9.9:1, ported RPM, those heads, a 1000 HP Holley, Erson rockers, and a Bullet 236 @ .050 cam, 112 LSA on 106.
To answer your question though, modern valve job and cleaning up the guide area is the number 1 concern and will bring the most gains. However, the C8/D2 port is pretty small although it is on a med riser centerline. With a standard RPM intake, I believe it's significantly smaller than the intake. So if you look at a port's cross sectional area, you want it to slowly reduce as it gets closer to the valve, if you do not port, I assume (haven't measured) it won't do that and depending on your intake, you may have a bit of mismatch as you go big plenum, big port, step into small port, then a decent bowl, it'll run fine, but not ideal
That being said, I also ran a set of C8s with 2.15/1.67, completely unported, on my first 427 build in the Mustang. I never flowed them, but it wasn't very fast :o
If it were me, a modern valve job, clean up the bowls, and at least gasket match to a 1247 and blend as deep as you can.
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Thanks guys
C8 head.. 2.03 seat
(http://i153.photobucket.com/albums/s201/winr1/IMG_8014_zps102f1bb5.jpg) (http://s153.photobucket.com/user/winr1/media/IMG_8014_zps102f1bb5.jpg.html)
(http://i153.photobucket.com/albums/s201/winr1/IMG_7983_zps45c53bf4.jpg) (http://s153.photobucket.com/user/winr1/media/IMG_7983_zps45c53bf4.jpg.html)
(http://i153.photobucket.com/albums/s201/winr1/IMG_78492000x1500_zps9a57533c.jpg) (http://s153.photobucket.com/user/winr1/media/IMG_78492000x1500_zps9a57533c.jpg.html)
http://i153.photobucket.com/albums/s201/winr1/IMG_8014_zps102f1bb5.jpg
Performer 390 intake
Widened .100 horizontal and vertical around 3" into port
(http://i153.photobucket.com/albums/s201/winr1/IMG_17822000x1500.jpg) (http://s153.photobucket.com/user/winr1/media/IMG_17822000x1500.jpg.html)
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Ricky.
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Run it, it will do well. With a Performer 390 no use putting any more time in the heads. It'll run nice
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I neglected to mention the Performer will be for breakin
I have a 2x4 and 3x2 intake as well, one of them will be utilized after breakin
Ricky.
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Sorry Ross.....
I throw your d2 thread around whenever someone asks "what should I do with these heads" or "Can I use stock heads on a stroker"
It's the easiest answer :P
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Sorry Ross.....
I throw your d2 thread around whenever someone asks "what should I do with these heads" or "Can I use stock heads on a stroker"
It's the easiest answer :P
No worries, I should have taken more pics
As far as swapping manifolds, I would not open the port to a low riser, but if you plan to run a low riser intake, I'd likely open the ports to a 1247 gasket. At least you'd have the roof and sides close
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With the bowls opened up to match the CJ valves and cleaned up as well
Are the ports ok as they are for a 418 ??
A bit under 10 to 1, under 500 lift cam
3.70 gear, 3500 lb 65 F100
.......................................................
Another question:
C8/D2 heads, stock size valves, how much gain with:
Cleaned up bowls only
Cleaned up bowls and cleaned up ports
Ricky.
Have you found any actual flow numbers on removing the #3 & #6 intake runner rocker bolt bumps? You can grind those to match and use studs but I have not seen any documented comparison.
On your 4x2 intake set up look at Eaton Balancing website or email him. He was telling me about a Ford medium riser set up that Ford had a port mismatch on from the factory. There was port work done to blend in but it ended up loosing some power. I do not remember what the combonation was. Maybe someone here has run into it and can give you the run down. I do remember it was not an isolated case.