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Old 10-01-2009, 11:07 AM   #1 (permalink)
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347 stroker startup and timing

Got a few questions as I get close to initial startup of new 347 engine. Here is what I am working with. If you need more info, let me know.
  • Jay Allen hyd. billet roller - Lobe sep. 113.90 - duration at .050 225/238.14 - Vac at idle 15.6 - Idle RPM 850
  • Canfield 195 heads
  • Trick flow roller rockers
  • 650 speed demon vac. secondaries
  • HEI type dist. (no haters please)
  • My timing chain is setup as R2 (retarded 2) when aligned dot to dot. This aligns to 0 on the pointer.
  • Autolite 3924 plugs
Questions

1) What should I shoot for on initial timing? 10, 12, more/less BTDC

2) What is a reasonable goal for total time, 32-36? I read others say play with it till its right, but I dont mess with this enough to know what "right" will be.

3) Whats would you recommend for gap on the autolite 3924 plugs? Have read many differences in this from 35-45

4) Whats the best way to configure everything for timing with the vac sec. carb? Hook it up or plug it off for timing setup?

5) Best oil for break in? I know there is no official break in for a roller, but should I still use rotella 10-30 or 15-40? Or do you still recommend some sort of break in for rings etc..?

6) Should I stick with a PCV valve with this setup?

really appreciate yalls knowledge and input!

thanks
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Old 10-01-2009, 02:01 PM   #2 (permalink)
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Re: 347 stroker startup and timing

1. I started with 10 and worked from there. Then time it with a vacuum gage and a good ear.
2. What is your compression. I would work with 32 to 34 to begin with.
3. gap .044
4. Are we talking the vacuum to the distributor. Leave your carburetor be. Disconnect and plug the line going to the distributor.
5. There's many best oils. I used 10W30 Pennzoil. I have a roller cam. Many people like many different oils. I prefer Valvoline. It gets wasted pretty quickly anyways.
6. Yes. I say yes because a PCV works for me.
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Old 10-01-2009, 08:58 PM   #3 (permalink)
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Re: 347 stroker startup and timing

Why aren't you asking these ?'s to Jay?? That cam looks pretty healthy. Should move on out...
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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.
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Old 10-02-2009, 05:53 AM   #4 (permalink)
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Re: 347 stroker startup and timing

Spali, without going into any bashing here, the short story is I cant get any help from him. I didnt buy this directly from him, I bought the 85% completed motor from someone who needed to sell. The guy I bought it from had jay do the cam, heads, timing set, etc... I called and talked to him when I bought it, and basically he doesnt want to support it since I am not the original buyer.

retyler, thanks for the detailed post, thats what I needed. the guy I bought it from said it was 10.8 compression. the short block build sheet says piston to deck: 0 deck for compression of 10.2.1

So my plan is to rotate the engine over by hand/socket to 10 on the pointer. Prime the oil pump, drop in the dizzy with rotor pointing to #1 plug while pointer is at 10. Sound right? Missing anything?
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Old 10-02-2009, 09:07 AM   #5 (permalink)
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Re: 347 stroker startup and timing

To find what your engine likes for initial ignition timing get the engine up to temperature, increase initial timing 2*, shut down and allow to heat soak for a minute then restart. If it starts easily, bump up 2* more, heat soak, restart. Keep doing this until the engine either drags the starter or coughs through the carb. Then back off 2*. The only time I've seen this not work was with a large duration cam of 300* advertised.
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Last edited by bmcd66250; 10-02-2009 at 09:10 AM.
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Old 10-02-2009, 01:51 PM   #6 (permalink)
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Re: 347 stroker startup and timing

Just read this to
Demon Selection Guide

BG says 14-16 initial with the 650 speed demon vac. secondaries, manual trans, 240 or less duration....hmmmm
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Old 10-02-2009, 05:42 PM   #7 (permalink)
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Re: 347 stroker startup and timing

Retyler's advice is a good place to start, although I would use .035 on the plugs.

If 10 degrees initial seems to work well then sneak up to 16-18 degrees. Recurve the distributor if necessary to achieve that and also get the total (initial plus mechanical) to come in less than 3000rpm.
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Old 10-02-2009, 09:25 PM   #8 (permalink)
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Re: 347 stroker startup and timing

I figured it was something like that. Well when you do get it running.......it'll be a screamer...
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Old 10-05-2009, 05:29 AM   #9 (permalink)
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Re: 347 stroker startup and timing

Quote:
Originally Posted by dennis111 View Post
Retyler's advice is a good place to start, although I would use .035 on the plugs.

If 10 degrees initial seems to work well then sneak up to 16-18 degrees. Recurve the distributor if necessary to achieve that and also get the total (initial plus mechanical) to come in less than 3000rpm.
That figures LOL, i just gapped to 44 and installed them this weekend before reading this post. Should I try that, or pull and regap??
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1956 Ford Mainline
347 Stroker
TKO 600
Ford 9" 3.70 trac lok
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Old 10-05-2009, 06:51 AM   #10 (permalink)
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Re: 347 stroker startup and timing

Quote:
Originally Posted by ctfortner View Post
That figures LOL, i just gapped to 44 and installed them this weekend before reading this post. Should I try that, or pull and regap??
You will be just fine.
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My little 65' Stang street car:



Dart 428W NA, 4 Spd, 4:33, on pump gas pushing 3550lbs.

10.553@127.81 with a 1.466 60'
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Old 10-06-2009, 11:01 AM   #11 (permalink)
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Re: 347 stroker startup and timing

Ok guys, excuse my newbieness here...

Now, by initial timing does that mean with the dist. out, rotate the engine and set the balancer to xx degrees BTDC, then put the dist. in at that point? Or does that mean to set the balancer at TDC (0 degrees) and install the dist. and then adjust to xx degrees BTDC via turning it while using the timing light.
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TKO 600
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Old 10-06-2009, 11:17 AM   #12 (permalink)
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Re: 347 stroker startup and timing

Initial Timing is when the distributor is in the block, engine running and you turn the distributor either advance to the left or retard to the right.
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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.
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