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07-03-2019, 07:35 PM
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#1 |
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Registered User
Join Date: Feb 2018
Location: Doland SD
Posts: 836
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307 heads
Had the valve covers off today to put new old ones on (hated the chrome ) and figured I would take some pictures of the casting numbers. Any one know what they mean
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 ( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original )94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green) |
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07-03-2019, 08:44 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,553
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Re: 307 heads
Look here for your casting number.
https://www.mortec.com/castnum.htm |
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07-03-2019, 10:21 PM
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#3 |
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Registered User
Join Date: Feb 2018
Location: Doland SD
Posts: 836
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Re: 307 heads
Thanks. look like the original 307 heads if I read that right
__________________
( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original )94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green) |
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07-03-2019, 10:46 PM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,553
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Re: 307 heads
A question for you!
You gonna set up a pcv system? Pcv in one cover and a breather in the other. You need it to remove the fumes and moisture in the motor and control the crankcase pressure. |
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07-04-2019, 12:06 AM
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#5 |
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Registered User
Join Date: Feb 2018
Location: Doland SD
Posts: 836
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Re: 307 heads
Yes I did not have a long enough hose at the time of the picture. It's all set up now.
__________________
( second times the charm) 71 gmc c15 307 sbc 373 rear gears positrac sm 465 trans. ( not listed on spid but is original )94 chevy k1500 350 tbi 373 rear gears 4l60e one wheel peel. Gutless 07 gmc sierra classic rcsb 4.3 lt 5 speed w/t 04 chevy Silverado 1500 ext cab 5.3 4l60e. 81 chevy Scottsdale k10 muncie sm465 Np208 10 bolt 8.2 ( Old Green) |
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