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1966 Fairlane With 502

1030 Views 32 Replies 11 Participants Last post by  19Fo79rdF250$
Installed a ATK 502 525 HP engine in the Fairlane. Had some over heating problems at 1st......fixed that with 2 elec fans and water pump fan.......... Now seems not to be producing 525 HP. Should be a screamer but not living up to ATKs HP claim ?


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Never over 225 and when it hit that was shut down... added fans and now never over 200. Timing at 20. Edelbrock heads. AF unknown. No smoking..... Runs smooth. Just not a screamer.
Initial timing is 22 deg have moved it up and down. Has MSD ign. Holly 780 that has been tuned.
Engine now is running 170 Carb is 850 Holly miss spoke earlier. Eddy springs are not good ? Humm.
My personal experience with ATK is that they almost always fall well short of their advertised HP/TQ numbers. I've helped two guys put their 347 "410 HP" engines in their cars, one a 4 speed Falcon and the other a Fairlane. Both were disappointing to say the least even after a few months of tuning on them, and when we dyno'd the Falcon we found out why: it put out a touch over 220 HP at the wheels through the manual trans....your 502, if it's the "515 HP" only has a hydraulic flat tappet with 225/235 @050 .536in/.541ex on a 112LSA. Pretty small, and along with that carb, and depending on your headers and intake, isn't going to be a real ripper on the top, but it'd be great in a F100 or the like. The base of the engine is good, just needs some stuff changed out in the way of a custom cam/intake/carb swap, and a good set of 1 7/8"-2" primary headers.
The scoop. I did buy the 545 engine and talking with others was convinced the cam might be too much for street use and would have little or no vacuum. Talked to ATK and they agreed. ATK advised the only difference in the two engines was the cam. The 545 version has a Comp cam 253 253 with 585 585 lift... the 515 engine has a Howards cam 225/225 and 536/541 lift..........I made the cam swap. Now running the Howards cam.
Do have nice 2" headers.
Not a screamer by any means.
We reset the initial to 30* I do not know what the total advance is Its Ignition system is MSD.
Runs about the same. Getting some dieseling or run on when shut down.
+1, get your total timing right. You can mess with the less-important idle timing after.

Sounds like you have some tuning to do. Whatever it will give, it won't do it until everything is tuned.

You solved your cooling, but your flex fan is too small for the shroud. A 7-blade paddle-blade fan of proper size will pull much more. Use it with a clutch (with coil spring on the face) if you have room.
Not a lot of room for larger fan. Bottom of the shroud fan almost touches. Im very disappointed in the ATK engine. Its not making anywhere near to 515 HP.
I bought the same engine for my LTD. Still not installed yet, but I bought the fully dressed version, so it came dyno tested. The Dyno sheet was packed with the engine.
My engine was complete and dyno tested. Let me know how much power it makes.
CVF worked great. Yes using a MSD box. I don't remember where the dyno sheet is and will look. Everything looks like the engine should be good but mine is low on HP.
Your dyno sheet looks like the one on the ATK sight. Im anxious to know how it goes for you. Where are you located?
Whoa! :oops: Initial (base idle) timing is 30°? That's dangerous, as it will add unknown timing as it revs.

As you do not know the centrifugal advance in your distributor, you can set timing by total (all-in) advance at high-rpm. Disconnect and plug the carb-side of your vacuum advance (if you have it). While watching the timing with the timing light, rev the engine until the timing advance stops adding timing. Note the degrees. Adjust the distributor position until the total timing (all-in) when revving to all-in is 34°.

If it were me, I would confirm exact timing mark location with a $10 spark plug thread timing stop (or make your own). Then if you do not have a dial-back timing light; add measured marks every 5° to 40°, before setting timing as-above. 34° is only a place to begin timing tuning, but should be much closer than guessing, and certainly safer than what it is.
ATK recommends 30 to 34 initial timing.
The engine has been tuned by a very good shop. I need to get the car back over there and do more tuning.
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