Thread: 402 Id help
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10-13-2008 09:26 PM #1
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402 Id help
Need some help finding what 402 this is, I'm pretty sure it's a 70 T402.
I would like to know what compression this engine is and if these are the correct heads ?????
Some sites say it's an open chambered engine and some say closed
chambered ????????
Block casting # 3969854
Head casting # 3975950
Engine code # TBG
Thanks for any help y'all can give me!!!!!
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10-14-2008 11:27 AM #2
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3969854 block casting number belongs to a 402 Big Block produced between 70-72. 2 and 4 bolt had same numbers.
3975950 head casting number is for 396/427 produced between 68-70. It has 2.06/1.77 valves and closed chamber oval ports.
TBG = 1970 Truck motor, 402CI with 310HP and originally bolted up to a TH400 automatic.
Good strong motor as a base for a BB rod..
Regards,
Glenn
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10-14-2008 08:33 PM #3
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Thanks a lot for that information, Do you know what compression this engine is ??????????? I assume this engine doesn't have the peanut oval ports.
Thanks for your help !!!!
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10-23-2008 06:52 PM #4
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Anyone have some good advise on a cam for this engine, its going in a 65 Chevy C10. Just a weekend driver.
9.1 compression, 700R trans, 373 gear.
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10-23-2008 07:17 PM #5
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Try the Comp Cams "Cam Quest" program, it's free and very helpful in cam selection and/or exploring cam options.....Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
Learning must be difficult for those who already know it all!!!!
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10-28-2008 06:21 PM #6
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Just pulled heads off and they are opened chambered any idea what cc these are ?????
Originally Posted by glennsexton
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10-29-2008 06:44 PM #7
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Still need help, engine disassembled the heads are open chambered but casting number says there closed
The pistons are closed chambered
Why would this engine have closed chamber pistons ????
Now I'm really confused should I just use them with the open chamber heads and if so how can I find out what compression I would have with this combo.
I can find no numbers on pistons but they have about a 2/16 - 3/16 dome on them and cannot find anything on what cc's these heads are ???
3969854 block casting
3975950 head casting
Thanks for any help !!!!
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10-31-2008 04:17 PM #8
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