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#1 |
Registered User
Join Date: Aug 2002
Location: wheatland, Ca
Posts: 427
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tune up specs 72 bbc
Hello,
I am looking for the original tune up specs for my 72, it has a 400 bbc aand a 400 tranny. I have recently added an HEI. I currenly have it set at 10 degres BDC, @ 650 RPM. I am also replacing the plugs which I am planning on gapping at .045. Any details will be appreciated. I did check the FAQ but could not find what I am looking for Regards, Mike
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Mike K Friend of Bill W |
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#2 |
Broken Down
Join Date: Dec 2006
Location: Choctaw, Oklahoma
Posts: 1,267
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Re: tune up specs 72 bbc
I have Mitchell on demand online tech manuals and the settings are all for points timing is set at 8 degrees and idle is at 600 rpms and .035 gap and this is for 402 bbc. The manual specifys 400 bbc in the repair side but not on the tune up section. If it is running good and you have no pingging go with what you have!!
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kenm78 1982 Chevy 4X4 Project truck ![]() ![]() ![]() ![]() “It’s better to keep your mouth shut and let people wonder about your ignorance, than open your mouth and reveal all doubt” |
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#3 |
Broken Down
Join Date: Dec 2006
Location: Choctaw, Oklahoma
Posts: 1,267
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Re: tune up specs 72 bbc
Ok did som more searching and found this
1976 400 BBC/454 BBC Spark plugs light duty R45TS Spark plugs heavy duty R44T Gap for either is .045 Torque to 15 foot pounds Timing is 8 Degrees BTDC. RPM 600 auto trans.
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kenm78 1982 Chevy 4X4 Project truck ![]() ![]() ![]() ![]() “It’s better to keep your mouth shut and let people wonder about your ignorance, than open your mouth and reveal all doubt” |
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#4 |
Registered User
Join Date: Aug 2002
Location: wheatland, Ca
Posts: 427
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Re: tune up specs 72 bbc
Thanks for the help, I will try bringing the timing down a little moer and see what happens for kicksI might hook up a vacum gauge an see what that shows
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Mike K Friend of Bill W |
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#5 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: tune up specs 72 bbc
I'd stay with the higher timing if you aren't having any preignition problems.
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