reworking heads
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New User
Joined: May 2001
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reworking heads
I HAVE A SET OF STOCK HEADS OFF OF A '71 5.0. I WAS PLANNING ON REPLACING THEM WITH A SET EDLEBROCK PERFORMER RPM HEADS, BUT MY BUDGET ISN'T COOPERATING. CAN I HAVE MY HEADS REWORKED TO MATCH THE SPECS OF THE AFTERMARKET HEADS? SPECS:
RPM: STOCK:
INTAKE PORT VOL- 170 cc 135cc
INTAKE VALVE SIZE- 2.020" 1.78"
EXHAYST VALVE SIZE- 1.600" 1.45"
EXHAUST PORT VOL- 60 cc 45 cc
COMBUSTION CHAMBER- 60 cc 64 cc
RPM: STOCK:
INTAKE PORT VOL- 170 cc 135cc
INTAKE VALVE SIZE- 2.020" 1.78"
EXHAYST VALVE SIZE- 1.600" 1.45"
EXHAUST PORT VOL- 60 cc 45 cc
COMBUSTION CHAMBER- 60 cc 64 cc
Junior User
Joined: Feb 2001
Posts: 54
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reworking heads
It would me almost impossible to match an aftermarket head with a stock one. Most aftermarket heads are completely redesigned to improve airflow and power in ways that are not practical in a production head.
You can gain quite a bit from working your stock heads, but after installing bigger valves, having them reworked and the heavy porting to come close to the aftermarket heads, you would have spent the better part of the price of the new heads.
You can gain quite a bit from working your stock heads, but after installing bigger valves, having them reworked and the heavy porting to come close to the aftermarket heads, you would have spent the better part of the price of the new heads.
Senior User
Joined: Jan 2001
Posts: 326
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reworking heads
You can't get the chambers to 60ccs or the 2.02" intakes, but the rest can be reworked to a pretty close match. If you ncould find a set of '70 or older heads they had 60cc chambers for sure.
Check out this site to see how to rework your heads:
http://www.fordmuscle.com/archives/2000/07/homeporting/index.shtml
These heads flowed as well as a set of Edlebrock Preformer heads.
A local shop will:
Clean and test the heads
Plane them
Install new 1.94/1.60 valves(3 angle grind)
Install new bronze guides
New springs
Install 3/8" screw in rocker studs
and Guide plates
for about $600 cdn
Then I'll spend about 12hrs doing the port work on the the '69 heads I have for my 302.
That makes for a cheap set of preformance heads.
RCC
Check out this site to see how to rework your heads:
http://www.fordmuscle.com/archives/2000/07/homeporting/index.shtml
These heads flowed as well as a set of Edlebrock Preformer heads.
A local shop will:
Clean and test the heads
Plane them
Install new 1.94/1.60 valves(3 angle grind)
Install new bronze guides
New springs
Install 3/8" screw in rocker studs
and Guide plates
for about $600 cdn
Then I'll spend about 12hrs doing the port work on the the '69 heads I have for my 302.
That makes for a cheap set of preformance heads.
RCC
Senior User
Joined: Oct 2000
Posts: 227
Likes: 0
From: arkansas
reworking heads
All I can say is this, KEEP SAVING MONEY! The Edelbrocks are worlds ahead of the old Henry's. Better throttle response, they pull to 6500, better gas mileage, etc. The airflow numbers are not the only way to compare heads. The chamber shape, port shape and location, and spark plug location are all very important factors in head design. You can possibly get 40 or so more horses from the stock iron heads, but it'll end up costing just as much as aftermarket heads. By the way, check out the aftermarket iron heads, tfs, world and others are making them and they are a bit cheaper than the aluminum versions.
