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08-31-2017, 07:42 PM | #1 |
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Join Date: Feb 2011
Location: Knoxville, TN
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Need help setting the timing of a 305
Hi, guys! I just broke in a mildly built 305. Seeking some advice from the 305 experts, please... and please don't criticize my engine choice lol. I had a reason for going that route - the safety of a teen-ager.. ugh!
9.7:1 compression Rebuilt 305 HO heads Comp Cams XE256 full cam kit Edelbrock Performer RPM intake Edelbrock 1403 carb (500 cfm) Stock HEI distributor Stainless shorty headers I used a stock harmonic balancer with the zero mark painted white but it has no numbers on it. Broke in the cam today - that went fine.. Straight headers right now and it's too loud to get a good feel for the timing. I presume I need some timing tape... What initial timing should I start with and how much total timing should this engine need? Thanks for any input! Posted via Mobile Device Last edited by Econman; 08-31-2017 at 08:31 PM. |
08-31-2017, 08:55 PM | #2 |
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Location: Bowser
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Re: Need help setting the timing of a 305
You'll need to experiment but here's some good info on figuring it out.
http://www.badasscars.com/index.cfm/...d=76/prd76.htm |
09-01-2017, 12:39 AM | #3 |
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Location: central California
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Re: Need help setting the timing of a 305
There's no timing tab on the timing chain cover? And btw that 305 seems like it'll be pretty sweet... still be plenty o' motor for a teenager.
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09-01-2017, 12:58 AM | #4 |
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Join Date: Mar 2003
Location: Colfax-California
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Re: Need help setting the timing of a 305
Is that a 350 cam spec or a 305 cam spec. May be kinda small for the compression
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09-01-2017, 11:19 AM | #5 | |
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Location: Moraga, CA
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Re: Need help setting the timing of a 305
Quote:
Unfortunately you have open headers, so the ear method won't work so well. EDIT: There is a nice discussion and picture here of what you should be seeing: http://67-72chevytrucks.com/vboard/s...d.php?t=151464 or maybe this one, depending on the style used in your engine: https://www.thirdgen.org/forums/tech...et-timing.html (see post #6)
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(Very) Slow-Going Build Thread: Stock 1970 Short Step with Stock 1970 LT-1 http://67-72chevytrucks.com/vboard/s...d.php?t=567340 Last edited by mattfranklin; 09-01-2017 at 11:26 AM. Reason: found a helpful link |
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09-01-2017, 01:28 PM | #6 |
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Re: Need help setting the timing of a 305
My 305 had the timing mark at the 12 o'clock on the stock H/Bal Don't know if all were this way.
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09-01-2017, 02:45 PM | #7 | |
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Re: Need help setting the timing of a 305
Quote:
The engine runs better the more throttle, but it is rough and wants to die pulling out of the hole. It is a stock/rebuilt TH350 with 1,750 stock stall converter. I haven't adjusted on the carb yet. I need to get the exhaust on it and then I can tell more about it. It rattles my teeth at this stage. |
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09-01-2017, 02:46 PM | #8 |
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Re: Need help setting the timing of a 305
Yeah, it has a timing tab. I think more than anything I am using an old-school race engine builder that is near retirement and isn't equipped to dial this timing in with a quality gun and is cranky about trying to getting the advance curved properly.
Last edited by Econman; 09-01-2017 at 02:52 PM. |
09-01-2017, 02:47 PM | #9 |
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Re: Need help setting the timing of a 305
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09-01-2017, 02:49 PM | #10 | |
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Re: Need help setting the timing of a 305
Quote:
And yes, you're right! These shorty headers open are deafening.. lol |
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12-03-2017, 06:31 PM | #11 | |
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Re: Need help setting the timing of a 305
Quote:
Picture Of The Wire And Where Its At Would Be Very Helpful Thank You Harley03joe
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