Distributor recurve - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 5 (permalink) Old 08-21-2019, 02:20 PM Thread Starter
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I have everything as far as I know to do this but there are some areas I want to discuss and try to figure this out as I am getting conflicting recomendations.

First off the distributor is a all new cardone model part #842831 with a steel gear. I know nothing about this specific distributor to know what kind of mechanical advance governor is being used.

With that said the crane dist tune up kit states to use the smaller slot as a recommendation. Seems the ideal governor is the 10L/15L for 20* to 30* mechanical advance. For me I am banking on this to set it to 20* mechanical advance with the use of two yellow springs to bring full advance in around 2500 to 2600 rpm.

My line of thought is to set initial around 10* to 12* which would give me a total of 30* to 32* of timing.

The vacuum advance that comes in the tune up kit is adjustable. This is where the confusion starts to come into play.

I have some state to limit total advance to 34* or 36* with the implication of it being full advance with vacuum advance. Then others state that I should keep total advance without vacuum around 30* and then dont worry too much about vacuum advance as I could see 50* advance at highway cruising and still get good economy and not build heat up.

I understand more I intial advance will help with low end response/power and that youd want all advance in by 2500 rpm as well. But the vacuum advance I have no idea how do you determine how much advance one should start off with on the vacuum advance and how you determine the proper amount.

I also have some telling me to run my dist as is first before making changes but its listed under my vehicle on rockauto with a DSII connector so to me I want to say it's safe to assume the timing on this dist is set up to mimic stock not set up for performance.

Outside of that I'm tempted to pick up a reman dist from a local shop to rob the plate out of to swap it in mine if it doesnt state what advance it is.

Right now my goal is to make my way through this and learn as much as I can before I tear the new dist apart for my tune up this weekend.

Last edited by Rusty_S85; 08-21-2019 at 03:05 PM.
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post #2 of 5 (permalink) Old 08-21-2019, 02:38 PM
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Re: Distributor recurve

first.. alittle info on your engine, usage, mpg expectations.
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post #3 of 5 (permalink) Old 08-21-2019, 02:56 PM Thread Starter
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Sure, engine isnt built yet but with what I have the specs are as follows.

306 CID roller short block
AFR 165 Renegade 58cc cylinder heads 1.90"/1.60" valves with 7/16" studs
9.5:1 compression
Performer intake manifold
Divided phenolic 1" spacer
Crane truckmax hydraulic roller cam : 216*/224* @ 0.050" lift, 0.520"/0.542" lift, 112* LSA, 107* ICL, 117* ECL, 1400 to 5400 rpm 6000 rpm redline 2400 to 3000 cruise.
600 cm summit vacuum secondary 4V carb with Holley quick change secondary kit
1.6:1 Scorpion Racing roller rockers 7/16" stud
Hedman short street headers for 86 to 96 f series trucks
Jegs off road Ypipe 2 1/2"
Intermediate pipe 2 1/2" with reducer to 2 1/4"
Magnaflow XL 3chamber 6" round muffler in 2 1/4"
Stock 2 1/4" mandrel bent tail pipe.

This is going in a truck that will be driven daily but may or may not see towing.

Transmission is a C6 that is stock but after I do the engine the trans will be pulled for a overhaul and upgraded with a wide ratio plantary gear set, kevlar bands, and what ever else it needs to improve dependability. I also want to install a rv/tow shift kit and find someone that can play with the C6 governor to get it to shift at wide open throttle at 5000 to 5500 rpm. Will be running I believe it is a XTM tow converter from Hughes that they recommended to me.

Based off how much slip I have that will determine if I change my axle ratio to 3.00:1 or 3.25:1. I hope I am able to run the 3.25:1 since I am running 31x10.50-15 AT tires.

My main goal by time I am finished is for the truck to run 65 to 75 mph between 2400 to 3,000 rpm for highway cruising if at all is possible. I also want the truck to perform better than it does now with its smog laden 135hp rated 302. I also would like to raise fuel economy over what the truck gets now which is 12 mpg city. Would like to get the truck to get around 14 mpg city and around 19 to 20 mpg highway. I think highway is around 15 and 16 mpg currently but that could be compounded by a worn out c6 and 2.75:1 stock gears with 31" tires.

Last edited by Rusty_S85; 08-21-2019 at 03:04 PM.
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post #4 of 5 (permalink) Old 08-22-2019, 10:09 AM Thread Starter
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Re: Distributor recurve

I been doing as much reading as I could I came across one site they say high performance applications mechanical advance should be all in at 2500 rpm to 3000 rpm and for towing or heavy load applications full mechanical advance should be delayed to 3,500 rpm or around that.

Now that makes me wonder as well now. My truck is a F150 swb flare side with a GVW of 5250 lbs. That's about the same GVW as my '78 Cougar XR7. But that doesn't account for weight being towed though just what the vehicle can carry on its suspension as a max weight.
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post #5 of 5 (permalink) Old 09-06-2019, 01:07 PM
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Re: Distributor recurve

the "all-in by 2500 rpm" guidance is for hotrods & street cars, not heavy trucks that will see towing.
stick with the stock curve for a truck that will be hauling/towing.
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