Well I just got my 67 gs340 out about a month ago and wanted to do a tune up I have done the points and plugs and the cap an rotor. I was wondering what timing setting are you guys using for your 300's thanks Adam
That's a good question, man. I'm looking forward to see what people say. I'm almost done setting up the Vega for the bodyshop. Then I can start assembling the engine. THen I will actually start fulfilling my sig. LOL! Wish I had a response for you...
In a 67 rag Skylark I have cam with 204/216 @.050, 110 LC installed at 106 and DCR of 8.1 I run 12/13 initial and about 36 total with a stock ignition. Runs on 87 octane no problem. Motor also has a triple angle vavle job and ported (by me) heads. I have yet to tweak the ignition but so far it runs pretty good for such a small engine. Anyone who rides in the car is surprised how well it runs. Ray
Not counting the vacuum advance, I have 38 degrees total at 3500 RPM with some advance still available. I don't know what the total is, probably about 40 something degrees at 4000+ RPM? The tach I use for timing it only goes up to 3500 RPM, it is still rising when it gets there. I also use full vacuum advance. I have a 64 300 with 10.25:1 pistons, a Poston cam and use 93 octane, it doesn't give me any pinging. I've tried several configurations, this set up has worked best for me. Folks here say to bring it in quicker, the problem is to do that I have to significantly retard the initial or use less vacuum advance to make it work. That might offer some marginal power increase at WOT, but my car is 100% street driven and when I've tried that I've had a noticable loss of throttle response at tip in. I'll give up that 20 hp or so to get a more lively vehicle.
Thought I might add my exhaust ports had considerable porting and had the bump removed too. I know from experience on a 350 chev engine I have with the stock iron heads it liked 40* total. With alum. heads and exellent ex. ports. 32* it ran the best with the same exhaust system. The more the ex. port flows less timing is needed. Ray
I'm running 11* initial, 30* total in by 2500 RPM. Stock 300, 10.25 compression...it needs 93 octane and I can't bring it in any faster without pinging. I'm also running 12* vacuum advance, manifold vacuum.
On this same subject, I don't know how anyone ran 2.5* initial from the factory...I tried that once with stock weights and springs and it was a total dog!
awesome this really helped you guys never fail to provide the answers I am looking for I have had this car since I was 16 now I am almost 25. It has been restored twice now due to a bad accident me senior year through it all you guys have been there. Thanks adam
You must have modded your distributer to only get you 19 degrees of mechanical advance. I would be interested in hearing how you did this, since this set up would seem to be ideal.
I bought a Mr. Gasket weight and spring set...allows only 19 degrees of advance...it cost about 7 bucks, I believe...I think I bought it at Car Quest...but it's been a few years.
