Desmogging the 73-86 460!!! - 460 Ford Forum
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post #1 of 38 (permalink) Old 03-16-2012, 11:55 PM Thread Starter
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Desmogging the 73-86 460!!!

Gonna start a sticky with tips and tricks to maximising power in the 73-86 460.

1. Timing set change; 72 and up have an 8* retard in the timing set stock. Install a 69-71 timing chain set (double roller is also a good upgrade).

2. Carb change; throw that 650 in the scrap pile and install a properly tuned list# 3310 carb

3. Getting rid of the EGR; (A) If your engine has the air injection tubing remove them and tap and install 1/4" pipe plugs in the heads. (B) On the Holley flanged intake remove the EGR spacer plate between the carb and intake purchase a new EGR to carb gasket and place directly onto the intake (this will be ~1/4" thick gasket) then install a 1" 4hole aluminum spacer then a standard holley gasket then the carb.

4. Tming; (A) replace a points distributor with a Duraspark unit that is recurved with a proper timing curve, (B) Set timing at 12* initial.

5. Both Crane and Harland Sharp offer roller rocker conversions; this is a great addition.

These are the methods I have devoloped over the years and will turn a lazy gas guzzling 460 into a lean tire frying beast with no major work.

Anyone who has other tips and tricks please feel free to share!
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Eric Millard
bigblok86gt@yahoo.com

528ci of N/A power

Circle R Racing Engines

Trick Chassis
Beloit,WI 53511
608-313-9197

http://www.trickchassis.com/

"LOL, WE DONT RACE DYNOS" Quoted for the truth!

Last edited by bigblok86ranger; 03-16-2012 at 11:58 PM.
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post #2 of 38 (permalink) Old 04-10-2012, 04:47 PM
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If you are going into the motor, learning to port the heads using tips from Scotty's website will help. It doesn't take that long, and on my first try, I picked up 4 mph in the 1/4 with 2 similar builds. That's about 40 hp.

Where's my beer and that half inch wrench?

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post #3 of 38 (permalink) Old 04-12-2012, 06:27 PM
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How about some 69-71 heads if they are just laying around?
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post #4 of 38 (permalink) Old 05-23-2012, 02:03 PM
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Quote:
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If you are going into the motor, learning to port the heads using tips from Scotty's website will help. It doesn't take that long, and on my first try, I picked up 4 mph in the 1/4 with 2 similar builds. That's about 40 hp.
Cletus what website are you referring to on porting the heads? Thanks
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post #5 of 38 (permalink) Old 05-23-2012, 08:05 PM
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.....ANYTHING done to reduce back pressure on the EXH side will help as well!

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post #6 of 38 (permalink) Old 05-25-2012, 03:41 PM
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Cletus what website are you referring to on porting the heads? Thanks


This one:


http://reincarnation-automotive.com/


Where's my beer and that half inch wrench?

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post #7 of 38 (permalink) Old 08-29-2012, 08:26 AM Thread Starter
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.....ANYTHING done to reduce back pressure on the EXH side will help as well!
Yes a decent set of headers or even increasing the exhaust piping size to 2 1/2" off the manifolds will both give noticeable increases.

I read an article about 20 years ago on doing these things and the guy claimed 90-110hp increase with these changes seems a bit optimistic but having done them to several stock smog era 460's the difference is dramatic.

Eric Millard
bigblok86gt@yahoo.com

528ci of N/A power

Circle R Racing Engines

Trick Chassis
Beloit,WI 53511
608-313-9197

http://www.trickchassis.com/

"LOL, WE DONT RACE DYNOS" Quoted for the truth!
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post #8 of 38 (permalink) Old 11-18-2012, 09:43 AM
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Nobody's posted on this thread in a few months, but this may be a helpful addition...
Yeah, just a good set of headers an pipes can do a lot for you. It's pretty cheap for the gain if you do the work yourself.

Mopar Muscle Magazine ran some dyno tests on a 440 in 2001 using stock manifolds, Hedman shorty headers, and Hedman Elites (long tubes). At 5200 rpm, the 440 put out 79.1 more HP with long tubes than with stock manifolds (about 19.3% HP increase). At the same rpm (5200 rpm), the 440 put out 90.2 ft/lbs more torque than with stock manifolds (about 19.4% torque increase). It showed about a 6.1% torque increase at 3000 rpm.

The shorty headers also showed significant increase, but in most cases I think I'd just go for long tubes if I was doing a header upgrade.

I haven't seen any charts or anything for exhaust size, but true dual exhaust always helps.

I'm currently dealing with sealing up a header leak (around flange), so headers can have drawbacks, but it doesn't take that much to get everything right.

- Collin
88' F-350 RCLB 4x4, 2" lift springs, 3" body lift, 37s, C6, 4.56 gears 1973 468, long tubes, RV cam, ported heads, Stealth intake
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post #9 of 38 (permalink) Old 12-04-2012, 11:43 AM
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get me farther down the road

can anyone help me with info on desmogging a 91. my 460 is in a 4x4 reg cab dually five speed with a overhead camper. i plan on putting a lot of miles on this rig and would like it as efficient as possible. im considering the 62 mm throttle body from summit,k&n filter and dual exhaust. any suggestions appreciated.
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post #10 of 38 (permalink) Old 12-04-2012, 08:32 PM Thread Starter
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can anyone help me with info on desmogging a 91. my 460 is in a 4x4 reg cab dually five speed with a overhead camper. i plan on putting a lot of miles on this rig and would like it as efficient as possible. im considering the 62 mm throttle body from summit,k&n filter and dual exhaust. any suggestions appreciated.
IMO you should leave the emmissions alone unless you know how to reprogram the computer.

Eric Millard
bigblok86gt@yahoo.com

528ci of N/A power

Circle R Racing Engines

Trick Chassis
Beloit,WI 53511
608-313-9197

http://www.trickchassis.com/

"LOL, WE DONT RACE DYNOS" Quoted for the truth!
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post #11 of 38 (permalink) Old 05-13-2013, 09:36 AM
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does the timing set have to be changed? or is that just an upgrade.looking to de smog my 78 mark v.

Last edited by killer501872000; 05-13-2013 at 09:40 AM.
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post #12 of 38 (permalink) Old 05-20-2013, 07:35 PM
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4. Tming; (A) replace a points distributor with a Duraspark unit that is recurved with a proper timing curve, (B) Set timing at 12* initial.




So what would that ignition curve be and how do you get it?
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post #13 of 38 (permalink) Old 06-05-2013, 10:23 AM
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4. Tming; (A) replace a points distributor with a Duraspark unit that is recurved with a proper timing curve, (B) Set timing at 12* initial.




So what would that ignition curve be and how do you get it?
Googletron picked this off the website linked above: http://www.reincarnation-automotive....ons_index.html
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post #14 of 38 (permalink) Old 08-15-2014, 02:38 PM
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EGR

Quote:
Originally Posted by bigblok86ranger View Post
Gonna start a sticky with tips and tricks to maximising power in the 73-86 460.

1. Timing set change; 72 and up have an 8* retard in the timing set stock. Install a 69-71 timing chain set (double roller is also a good upgrade).

2. Carb change; throw that 650 in the scrap pile and install a properly tuned list# 3310 carb

3. Getting rid of the EGR; (A) If your engine has the air injection tubing remove them and tap and install 1/4" pipe plugs in the heads. (B) On the Holley flanged intake remove the EGR spacer plate between the carb and intake purchase a new EGR to carb gasket and place directly onto the intake (this will be ~1/4" thick gasket) then install a 1" 4hole aluminum spacer then a standard holley gasket then the carb.

4. Tming; (A) replace a points distributor with a Duraspark unit that is recurved with a proper timing curve, (B) Set timing at 12* initial.

5. Both Crane and Harland Sharp offer roller rocker conversions; this is a great addition.

These are the methods I have devoloped over the years and will turn a lazy gas guzzling 460 into a lean tire frying beast with no major work.

Anyone who has other tips and tricks please feel free to share!
I know this is a sticky and not a Q&A thread but:
What do I plug the intake manifold with where the ERG plate used to cover? I bought a new carb and 1" riser but the riser won't cover the exhaust port on the intake.
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post #15 of 38 (permalink) Old 08-18-2014, 08:02 AM
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Quote:
Originally Posted by Beedub109R View Post
I know this is a sticky and not a Q&A thread but:
What do I plug the intake manifold with where the ERG plate used to cover? I bought a new carb and 1" riser but the riser won't cover the exhaust port on the intake.
Go to hardware store for a chunk of aluminum 1/8" flat bar/plate and some gasket paper and make a block off plate.
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