Timing Curve Setup on my 347 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 3 (permalink) Old 07-27-2009, 06:15 AM Thread Starter
Join Date: Jan 2007
Location: Ashville, Ohio
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Timing Curve Setup on my 347

I am finally getting around to working on my timing curve on my SFB 347. Here are the details of my build: Probe crank and forged rods and flat top pistons, Crane hydraulic roller rocker cam with 1.6 roller rockers (cam - I .563/232 E .595/244), Victor Jr heads and single plane intake. 750 Holley. MSD billet distributor, Blaster 2 coil, and 6AL box. I have the rev limiter set at 6600. Performance Automatic C4 and 10" converter.

Before I installed the distributor in the car I installed the lightest springs from the MSD kit. I use the vacuum advance port off of the front valve body. The initial timing with the vaccum hose disconnected is 12 degrees BTDC.

I have never profiled the advance curve and that is what I want to do. Any ideas on initial timing, vacuum assist or not, total advance and at what RPM should I shoot for for max advance?

I drive this car mostly on the street with several trips a year to the 1/4 mile. Any help would be greatly apprecited. Thanks, John

'89LX, 347 Probe forged stroker kit, Victor Jr. head & Edelbrock F28 dual quad (500's) intake, TKO 500 with Centerforce D.F. Clutch, 4:10/8.8, MSD ignition, Crane cam, BBK 1 5/8 long tube headers.
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post #2 of 3 (permalink) Old 07-28-2009, 02:02 AM
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Re: Timing Curve Setup on my 347

I would think your 12 degrees initial timing is a tad low. I know my 347 likes about 18-20 degrees initial with 34 degrees total. I had to take the vacuum hose off my port of the dizzy/plug the hose and bring the rpms to 3600rpms/34 degrees where I locked down the dizzy. I have 11:1 compression so anything less can be pushed to 35-36 degrees or so.

Running with vacuum advance like I am.....enables better throttle response and a little bit better on the gas consumption.

I'm running a 240/246 @ .050 with .540/.544 lift on my flat tappet hydraulic.

347 Stroker, 10.6:1, Vic Jr, World Jr. heads (2.02/1.60 valves), Custom 780cfm ProSystems 4150 Double Pumper, XE284H cam, MSD E-Curve, 4.30 gears/31 Spline axles, Tremec TKO 5 Speed w/.83 5th gear ratio.

Last edited by Spali32; 07-28-2009 at 02:07 AM.
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post #3 of 3 (permalink) Old 07-28-2009, 05:59 AM
Join Date: Oct 2007
Posts: 27
Re: Timing Curve Setup on my 347

There's a good article on Performance Distributors - High Performance and Racing Ignition Systems that explains ignition timing and absolutely using vacuum advance on anything that's not 100% race track driven. Pretty much disconnect the vacuum advance, set your initial to get your total. Once you get the initial and total set, load the engine at low rpm...like shift into 5th at 2000 rpm and slowly accelerate...if it pings, you'll have to adjust the vacuum advance. Some cans have it, if not I think crane or mallory sell an adjustable can to replace the stock one. You tighten or loosen the diaphragm by sticking an allen wrench in the vacuum hose nipple. You can increase or decrease the vacuum advance curve that way.
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