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12-02-2016, 11:03 PM
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#1 |
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Registered User
Join Date: Dec 2007
Location: Cottage Grove, MN
Posts: 57
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Timing chain info needed please.
396 BB engine, #1 at TDC. Do the dots on the gears go 12 and 6 o'clock or 12 and 12? Thanks in advanced.
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12-02-2016, 11:32 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,738
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Re: Timing chain info needed please.
If you're talking #1 tdc compression then it's 12 and 12.
And if you think about it, 12 and 6 is impossible. |
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12-02-2016, 11:39 PM
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#3 |
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Registered User
Join Date: Dec 2007
Location: Cottage Grove, MN
Posts: 57
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Re: Timing chain info needed please.
So then crank at 12 and cam at 6 would be #6 compression?
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12-02-2016, 11:43 PM
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#4 |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,728
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Re: Timing chain info needed please.
If 12 and 6 is impossible, I'm missing something. Wouldn't that be the crank gear mark at 12 oclock, and the cam gear mark at 6 oclock, something like in this pic? One more revolution and they'd both be at 12 oclock.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-02-2016, 11:44 PM
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#5 |
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Registered User
Join Date: Jan 2012
Location: Petal,Ms.
Posts: 428
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Re: Timing chain info needed please.
Yes crank gear at 12 cam gear at 6. Put chain on and rotate both to 12 before dropping distributor in.
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12-02-2016, 11:46 PM
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#6 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,738
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Re: Timing chain info needed please.
Yup!!
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12-02-2016, 11:47 PM
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#7 |
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Registered User
Join Date: Dec 2007
Location: Cottage Grove, MN
Posts: 57
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Re: Timing chain info needed please.
Yes they would both be at 12. I just want to make sure i'm dropping distributor in at right plug location, not 180 off.
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12-02-2016, 11:50 PM
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#8 |
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Registered User
Join Date: Dec 2007
Location: Cottage Grove, MN
Posts: 57
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Re: Timing chain info needed please.
Thanks all. Love this site.
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12-02-2016, 11:51 PM
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#9 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,728
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Re: Timing chain info needed please.
My manual doesn't cover BBC, only SBC, but I believe they are the same. It shows 12 and 12 with #1 at TDC, and 12 and 6 with #6 at TDC. We're all on the same page then.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-02-2016, 11:53 PM
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#10 | |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,738
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Re: Timing chain info needed please.
Quote:
If you rotate the crank from the dot at 12 down to 6 then the cam gear only turns a 1/4 of a rotation, not a half rotation.. i |
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12-03-2016, 12:00 AM
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#11 |
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20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,728
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Re: Timing chain info needed please.
No, I misunderstood and thought you meant you couldn't have the crank at 12 and the cam at 6. It's all good though, we're all in agreement.
__________________
- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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12-03-2016, 02:35 PM
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#12 | |
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Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Timing chain info needed please.
Quote:
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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