big block aluminum heads
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
It really depends on the budget you want to spend, and if you're going to change the cam/intake with the heads.. Also need to know what pistons are in your motor?
Most of the aftermarket aluminum heads have fairly large combustion chambers (like 119cc)....those will likely lower the compression on a stock 427, thus you would LOSE power.....
I would probably try the TrickFlow 280 ovals or Brodix RaceRite 270 ovals. (if you have enough dome on the pistons)
Edelbrock also makes a 454-O, high compression head with 100cc chambers which might work ok for you.... All depends on what pistons you have. You're really gonna need to upgrade the intake manifold to something like an RPM or RPM air gap to really see any difference at all with the heads....same goes for the cam really..
***ALSO beware of the raised exhaust ports on lots of the BBC heads, your headers/side pipes may have issues... The Brodix RaceRites have the stock exhaust port location I believe.
Most of the aftermarket aluminum heads have fairly large combustion chambers (like 119cc)....those will likely lower the compression on a stock 427, thus you would LOSE power.....
I would probably try the TrickFlow 280 ovals or Brodix RaceRite 270 ovals. (if you have enough dome on the pistons)
Edelbrock also makes a 454-O, high compression head with 100cc chambers which might work ok for you.... All depends on what pistons you have. You're really gonna need to upgrade the intake manifold to something like an RPM or RPM air gap to really see any difference at all with the heads....same goes for the cam really..
***ALSO beware of the raised exhaust ports on lots of the BBC heads, your headers/side pipes may have issues... The Brodix RaceRites have the stock exhaust port location I believe.
Last edited by ajrothm; May 27, 2014 at 09:22 PM.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
It really depends on the budget you want to spend, and if you're going to change the cam/intake with the heads.. Also need to know what pistons are in your motor?
Most of the aftermarket aluminum heads have fairly large combustion chambers (like 119cc)....those will likely lower the compression on a stock 427, thus you would LOSE power.....
I would probably try the TrickFlow 280 ovals or Brodix RaceRite 270 ovals. (if you have enough dome on the pistons)
Edelbrock also makes a 454-O, high compression head with 100cc chambers which might work ok for you.... All depends on what pistons you have. You're really gonna need to upgrade the intake manifold to something like an RPM or RPM air gap to really see any difference at all with the heads....same goes for the cam really..
***ALSO beware of the raised exhaust ports on lots of the BBC heads, your headers/side pipes may have issues... The Brodix RaceRites have the stock exhaust port location I believe.
Most of the aftermarket aluminum heads have fairly large combustion chambers (like 119cc)....those will likely lower the compression on a stock 427, thus you would LOSE power.....
I would probably try the TrickFlow 280 ovals or Brodix RaceRite 270 ovals. (if you have enough dome on the pistons)
Edelbrock also makes a 454-O, high compression head with 100cc chambers which might work ok for you.... All depends on what pistons you have. You're really gonna need to upgrade the intake manifold to something like an RPM or RPM air gap to really see any difference at all with the heads....same goes for the cam really..
***ALSO beware of the raised exhaust ports on lots of the BBC heads, your headers/side pipes may have issues... The Brodix RaceRites have the stock exhaust port location I believe.
Thread Starter
Racer
Joined: Feb 2014
Posts: 252
Likes: 25
Burning Brakes
Joined: Feb 2012
Posts: 925
Likes: 7
Besides a performance improvement, it's 70 lbs. off the car. Don't throw in the towel just yet. What heads do you have now? I went from 10.5:1 CR in 109cc stock rectangular port 840 heads to GMPP/Edelbrock 110cc combustion chamber large oval port 290cc runner heads. A friend went from a stock 427/390 head with 10.25:1 CR and a 435 cam to the same heads. Stock exhaust locations. I have a set of the smaller 100cc chamber heads on my engine now with some work done for 11:1CR. Brodix Race-Right oval ports are good heads (probably flow better than the Edelbrocks), but they don't come with the exhaust stud holes heli-coiled. Brodix offers it as an option though.
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Drifting
Joined: Jul 2009
Posts: 1,531
Likes: 13
From: Dallas-Fort Worth TX
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
The Edelbrock heads have standard port locations, and are available in small chamber (110cc and 100cc) if you have low compression pistons. They're a good choice for a street car. Don't make as much power as AFR or Brodix, but unless you race it you'll never notice.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
http://forums.corvetteforum.com/c3-t...lum-heads.html see post #10
Your results may vary. Just my experience and what I did to confirm how much raised port I could use without problems.
Your results may vary. Just my experience and what I did to confirm how much raised port I could use without problems.
Safety Car
Joined: Aug 2000
Posts: 3,909
Likes: 26
From: Clymer PA
I'm running 320cc intake runner heads from Pro Topline. They are aluminum with 119cc combustion chambers and 2.25/1.88 valves. I'm pretty sure the company has long been defunct. I got them probably 6-8 years ago for $1500 complete and shipped to me. I saved around 80lbs in weight. I will admit that even with the torque of my 454 and 4.11 gears with a 4 speed....the loss in bottom end was substantial. I have probably 50-100 more horsepower since changing my setup, but anything under 2500-2800RPMs feels very sluggish. Once you get past that RPM range you can't hit the next gear quickly enough (it does rev way faster). Stop light to stop light however is not as much fun as it used to be.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
It would be worth while to contact Mark Jones at vortecperformance and see What it would cost to have your heads ported, The man is a God to porting big block chevy heads.
Race Director
Joined: Dec 1999
Posts: 10,230
Likes: 885
From: Alexandria, Virginia, USA VA
I've got a set of procomp CNC bare heads
these are a "china clone" ebay head but the quality has gotten much better and the flow a ton (around 400 cfm)
I'm going LS so they are going up for sale (need $1600 for the pair, again they are BARE)
nice looking head
I like the musi edlebrock stuff too but you're gonna pay and for a bit more pop on a street car, I doubt you'll see it
budget on a nice solid or high end hydraulic roller the cams make gobs of midrange and will pull hard up top
use some LIGHT valves and good springs to match the cams. BB chevy have some heavy stuff and RPMS become an issue with high lift hydraulics and the modern oils don't hold up as well with flat tappet stuff unless you get the right oil!!!!
I've also got a 496 BB chevy "on the stand"
2 bolt main 4.25 stroker, with a nice high rise intake, mild street cam that pulls to 6 k and the combo makes a nice round 560 hp with that much torq to boot
probably all you'll need for a while
PM me if you'd like details.
these are a "china clone" ebay head but the quality has gotten much better and the flow a ton (around 400 cfm)
I'm going LS so they are going up for sale (need $1600 for the pair, again they are BARE)
nice looking head
I like the musi edlebrock stuff too but you're gonna pay and for a bit more pop on a street car, I doubt you'll see it
budget on a nice solid or high end hydraulic roller the cams make gobs of midrange and will pull hard up top
use some LIGHT valves and good springs to match the cams. BB chevy have some heavy stuff and RPMS become an issue with high lift hydraulics and the modern oils don't hold up as well with flat tappet stuff unless you get the right oil!!!!
I've also got a 496 BB chevy "on the stand"
2 bolt main 4.25 stroker, with a nice high rise intake, mild street cam that pulls to 6 k and the combo makes a nice round 560 hp with that much torq to boot
probably all you'll need for a while
PM me if you'd like details.
Race Director
Joined: Dec 1999
Posts: 11,091
Likes: 990
From: Sierra Foothills CA
It really depends on the budget you want to spend, and if you're going to change the cam/intake with the heads.. Also need to know what pistons are in your motor?
Most of the aftermarket aluminum heads have fairly large combustion chambers (like 119cc)....those will likely lower the compression on a stock 427, thus you would LOSE power.....
I would probably try the TrickFlow 280 ovals or Brodix RaceRite 270 ovals. (if you have enough dome on the pistons)
Edelbrock also makes a 454-O, high compression head with 100cc chambers which might work ok for you.... All depends on what pistons you have. You're really gonna need to upgrade the intake manifold to something like an RPM or RPM air gap to really see any difference at all with the heads....same goes for the cam really..
***ALSO beware of the raised exhaust ports on lots of the BBC heads, your headers/side pipes may have issues... The Brodix RaceRites have the stock exhaust port location I believe.
Most of the aftermarket aluminum heads have fairly large combustion chambers (like 119cc)....those will likely lower the compression on a stock 427, thus you would LOSE power.....
I would probably try the TrickFlow 280 ovals or Brodix RaceRite 270 ovals. (if you have enough dome on the pistons)
Edelbrock also makes a 454-O, high compression head with 100cc chambers which might work ok for you.... All depends on what pistons you have. You're really gonna need to upgrade the intake manifold to something like an RPM or RPM air gap to really see any difference at all with the heads....same goes for the cam really..
***ALSO beware of the raised exhaust ports on lots of the BBC heads, your headers/side pipes may have issues... The Brodix RaceRites have the stock exhaust port location I believe.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Safety Car
Joined: Aug 2000
Posts: 3,909
Likes: 26
From: Clymer PA
The 119cc chambers are pretty big and would drop your compression considerably . The lower compression by itself won't cost you much in terms of horsepower...what will cost you with the lower compression is the ability to run a larger cam to compliment the heads. I run side pipes and supposedly my heads have 3/8" or 7/16" (it's been a while I can't remember) raised exhaust ports and the Hooker side pipes bolted right up much to my surprise and to this day I have no idea how??? I bought the side pipes off of eBay a long time ago for like $550 shipped to my house. I would definitely consider a larger O-port if it sees a logic street use. Like I said in my first post the 320cc intake runners definitely hurt my port velocity and bottom end. I don't mind much because I am more worried about my HP and 1/4 times and fan deal with a little bit of sluggishness from stop light to stop light.
Pro
Joined: Apr 2014
Posts: 614
Likes: 186
From: Orlando, Dundee, Val-des-Monts PQ
I was recently told by a head rebuilder/new head salesman that Brodix is the ONLY head cast in America, all others are cast in China and machined here. If it makes a difference to you.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak