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02-12-2009, 09:49 PM
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#1 |
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Registered User
Join Date: May 2008
Location: Katy,Tx
Posts: 65
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Need some info
ok guys I need some info on the motor that is my truck. I was told it was a crate motor. The number on the back of the block is 3970070 and the numbers on the head are GM 24 and also 3932454. Any info you guys could dig up would be greatly appreciated.
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02-12-2009, 10:16 PM
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#2 |
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Account Suspended
Join Date: Nov 2008
Location: Burnet Texas
Posts: 121
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Re: Need some info
The heads are off a 68-69 307. Can't find the block number,m are you sure it is 3970070?
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02-12-2009, 10:29 PM
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#3 |
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Registered User
Join Date: Sep 2008
Location: Regina, Saskatchewan
Posts: 43
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Re: Need some info
It's probly 3970010.....probly just got some gunk making it hard to read...
3970010....302.....69....4...Z-28 Camaro 3970010....327.....69....2...Trucks and industrial 3970010....350...69-80...2 or 4 Heads are: 3932454....69-73...307 3932454....69-79...350..........Truck from www.mortec.com
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1972 GMC LWB, 250, 4sp 2010 GMC Sierra 6.6 CCSB Last edited by slow72; 02-12-2009 at 10:32 PM. |
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02-12-2009, 10:41 PM
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#4 |
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Registered User
Join Date: May 2008
Location: Katy,Tx
Posts: 65
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Re: Need some info
ok, thanks guys. So do you think these heads are anything special or just your run of the mill heads?
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02-12-2009, 10:45 PM
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#5 |
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Account Suspended
Join Date: Nov 2008
Location: Burnet Texas
Posts: 121
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Re: Need some info
I would say junk coming off a 307.
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02-12-2009, 10:57 PM
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#6 |
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Registered User
Join Date: May 2008
Location: Katy,Tx
Posts: 65
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Re: Need some info
I was told it was a 350...so i'm thinkin the heads are off a 350. any ways to tell the difference
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02-12-2009, 11:10 PM
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#7 |
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Account Suspended
Join Date: Nov 2008
Location: Burnet Texas
Posts: 121
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Re: Need some info
The heads are off a 307. Run the numbers thats the only way to tell. Any small blosk head will work on a 350 but a 307 is a low horsepower engine so I would guess they are a large cc with small valves.
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02-12-2009, 11:14 PM
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#8 |
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Registered User
Join Date: Sep 2008
Location: Regina, Saskatchewan
Posts: 43
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Re: Need some info
according to mortec the heads could be off a 307 OR a 350. Either way they're probably smogger heads with valves as big as 1.94, 1.50's at best.
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1972 GMC LWB, 250, 4sp 2010 GMC Sierra 6.6 CCSB |
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02-12-2009, 11:19 PM
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#9 |
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Account Suspended
Join Date: Nov 2008
Location: Burnet Texas
Posts: 121
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Re: Need some info
The book I have only shows it to be off a 307, I dont always trust the internet , off course this is an old book. I don't doubt it could be off a 350 ,but I would still bet this is a low performance head.
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02-12-2009, 11:21 PM
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#10 |
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Registered User
Join Date: Sep 2008
Location: Regina, Saskatchewan
Posts: 43
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Re: Need some info
Agreed....I don't have any books and just rely on mortec but they could be wrong. Like you say low performance either way.
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1972 GMC LWB, 250, 4sp 2010 GMC Sierra 6.6 CCSB |
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