C8AE-H heads
Senior User
Joined: Dec 2008
Posts: 124
Likes: 0
From: Mississippi
C6ae-r vs. c8ae-h
Can anyone tell me which head is better, c6ae-r or c8ae-h? Second question what kind of power can I get from these heads?I am putting them on a 390 with flat tops, 274 crane cam, edelbrock performer intake, 750cfm. edelbrock carb.I have read a lot about these heads but, No one has said what kind of horse power they produce?Can anyone give me some idea of what they produce?
Senior User
Joined: Dec 2008
Posts: 124
Likes: 0
From: Mississippi
c6ae-r vs. c8ae-h heads
I have both heads c6ae-r /c8ae-h, which one is better?Can anyone tell me what kind of power will these heads produce?I am putting them on a 390 with flat tops, 274 crane cam,edlebrock performer intake, edlebrock 750 cfm carb.?Can anyone give me a ball park figure on horse power on both sets of heads?
Senior User
Joined: Dec 2008
Posts: 124
Likes: 0
From: Mississippi
Best Intake w/ c6ae-r or c8ae-h
I was told that the Edlebrock Performer intake was not a good choice, "They said,it would hurt my horse power with c6ae-r or c8ae-h"? What intake would be better,Performer RPM, Weiand Stealth,or go to a single plane intake?Could I use a 1'' or 2'' spacer with the Performer?Any idea of what I should do?Thanks, zrxlover.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
I was told that the Edlebrock Performer intake was not a good choice, "They said,it would hurt my horse power with c6ae-r or c8ae-h"? What intake would be better,Performer RPM, Weiand Stealth,or go to a single plane intake?Could I use a 1'' or 2'' spacer with the Performer?Any idea of what I should do?Thanks, zrxlover.
What is this engine going in??? What gears? What size valves are in the heads? What are you trying to accomplish??? A little hard to point "YOU" in the right direction if you cant provide the info...... Otherwise its a wast of time to try to tell ya what you should use. Does that make sense to ya? I dont want to give out bad info....JMHO
Senior User
Joined: Dec 2008
Posts: 124
Likes: 0
From: Mississippi
c8ae-h reply to 428cj
I'm sorry for not providing the right information 428cj. Let me try again,the motor is in a 1976 F-100 with 3.25 gears, 2.02 in./1.55 ex. valves,274 crane cam,edlebrock performer intake, Holley 600 cfm carb.,TCI saturday night special torque converter, 28 deg. advanced timing. I was wondering what horse power am I making with this set up.I have two sets of c6ae-r heads also,I was wondering if I should rebuild these heads and put them on or stay with the c8ae-h? I'm trying to get the most horse power I can for a street machine. What intake do you recommend?Is this enough information 428cj? Thank you for your reply, zrxlover.
Elder User
Joined: Mar 2004
Posts: 747
Likes: 0
From: Klamath Falls OR
I'm sorry for not providing the right information 428cj. Let me try again,the motor is in a 1976 F-100 with 3.25 gears, 2.02 in./1.55 ex. valves,274 crane cam,edlebrock performer intake, Holley 600 cfm carb.,TCI saturday night special torque converter, 28 deg. advanced timing. I was wondering what horse power am I making with this set up.I have two sets of c6ae-r heads also,I was wondering if I should rebuild these heads and put them on or stay with the c8ae-h? I'm trying to get the most horse power I can for a street machine. What intake do you recommend?Is this enough information 428cj? Thank you for your reply, zrxlover.
I would run the C8's with a 2.09In And a 1.66Ex. They used those same heads with that Valve size on the 428PI's.
Later I would upgrade some of your parts to help get the most out of your engine. I would run one of these intakes: ED Streetmaster, Holley Street Dominator, ED F-427, Fords PI, ED RPM and so on.
I also would change your carb to at least a 650-750 Holley carb. Next would be headers (if you dont have them already) with 2.5" dual exhaust. Also a cheap set of Roller Rockers (like Comps, or the ones I listed). Also a set of 3.5 to 3.7 gears will help a ton! But you might like your 3.25 gears.....
Like I have said, do it over time and you will get there. Those things I have listed will help get the most out of your 390 and you will be able to drive it everyday with out affecting your street ability. It would be a "VERY" good start!!! JMHO
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
Good advice Wes. BTW Happy New Year!! Also the price of everything you listed is close to or under $2000 depending the prices you can find. That's not a whole lot for everything you get.
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Elder User
Joined: Mar 2004
Posts: 747
Likes: 0
From: Klamath Falls OR
Happy New Year G!!! I got a very interesting guest stopping by here soon! I'll have to give ya a call Bro. Tell your family HI and I wish ya the best!!!
Senior User
Joined: Dec 2008
Posts: 124
Likes: 0
From: Mississippi
c8ae-h 390 f-100 build
Thanks for your advice 428cj, I will get a different intake and get a 750 cfm carb.. I have headers dual exhaust 3'' to flowmasters and 2.25'' outlet of flowmasters with H-pipe. I know that the 3.5 to 3.70 gears will perform better but, I will be tacked up on the highway @ 70 mph. with the 3.70's. I might try the 3.50's?Thanks again 428cj for your knowledge and time, zrxlover.
Elder User
Joined: Mar 2004
Posts: 747
Likes: 0
From: Klamath Falls OR
Thanks for your advice 428cj, I will get a different intake and get a 750 cfm carb.. I have headers dual exhaust 3'' to flowmasters and 2.25'' outlet of flowmasters with H-pipe. I know that the 3.5 to 3.70 gears will perform better but, I will be tacked up on the highway @ 70 mph. with the 3.70's. I might try the 3.50's?Thanks again 428cj for your knowledge and time, zrxlover.
Postmaster
Joined: Aug 2005
Posts: 2,760
Likes: 8
From: Gadsden Purchase
They kick butt for proportion problems where you are considering changes.
A calculator will spit out numbers but give you no feel for what's going on
and get you confused right quick if you enter something in the wrong order.
I slid the 3 over the 3.5 and got:
12/14 and 17/20 lined up straight.
So if your gear has 17 teeth a 20 tooth gear would get you the same.
Is your odometer and speedometer reading right now?
How far off are they?
http://www.panix.com/~alvinj/file12/SpeedTable.jpg
How many teeth your speedometer gear you got now? :)
Easy as anything to get it "closer to right" when the new gear is chosen.
Bigger tires got it to reading slow?
Alvin in AZ
Senior User
Joined: Dec 2008
Posts: 124
Likes: 0
From: Mississippi
Yeah, if you ain't got a slide rule, get one. 
They kick butt for proportion problems where you are considering changes.
A calculator will spit out numbers but give you no feel for what's going on
and get you confused right quick if you enter something in the wrong order.
I slid the 3 over the 3.5 and got:
12/14 and 17/20 lined up straight.
So if your gear has 17 teeth a 20 tooth gear would get you the same.
Is your odometer and speedometer reading right now?
How far off are they?
http://www.panix.com/~alvinj/file12/SpeedTable.jpg
How many teeth your speedometer gear you got now?
Easy as anything to get it "closer to right" when the new gear is chosen.
Bigger tires got it to reading slow?
Alvin in AZ
They kick butt for proportion problems where you are considering changes.
A calculator will spit out numbers but give you no feel for what's going on
and get you confused right quick if you enter something in the wrong order.
I slid the 3 over the 3.5 and got:
12/14 and 17/20 lined up straight.
So if your gear has 17 teeth a 20 tooth gear would get you the same.
Is your odometer and speedometer reading right now?
How far off are they?
http://www.panix.com/~alvinj/file12/SpeedTable.jpg
How many teeth your speedometer gear you got now?
Easy as anything to get it "closer to right" when the new gear is chosen.
Bigger tires got it to reading slow?
Alvin in AZ