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03-16-2004, 12:18 PM
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#1 |
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Registered User
Join Date: May 2002
Location: Gainesville, Georgia
Posts: 704
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'69 307: Large or small journal?
I have an anemic 307 in the beater. If my memory serves me, sbc's used small journal cranks through '67, then large journal cranks '68-up. Is this correct? I'm thinking of using the rotating assembly (minus pistons of course) to build a 327. Just wanted to know which block to look for. Also, would this crank be cast or forged?
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We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC... |
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03-16-2004, 02:33 PM
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#2 |
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"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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cast iron, large journal crank
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Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087 |
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03-18-2004, 02:46 AM
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#3 | |
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Registered User
Join Date: Jun 2002
Location: NW ARKANSAS
Posts: 258
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Re: '69 307: Large or small journal?
Quote:
Do you mean which 327 block?It would be easier to find a 350 block to put it in. |
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03-18-2004, 09:44 AM
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#4 |
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Registered User
Join Date: May 2002
Location: Gainesville, Georgia
Posts: 704
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 Exactly. I just wanted to know if I needed a small-journal 327 block or a large-journal 327-350. Thanks.
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We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC... |
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03-18-2004, 10:54 AM
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#5 |
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Registered User
Join Date: Jan 2004
Location: Oklahoma
Posts: 1,057
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If you build a 327 i have a set of SJ aluiminum rods i am selling.
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Youth soon passes away, but immaturity can last a life time. |
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03-18-2004, 03:50 PM
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#6 |
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Registered User
Join Date: Feb 2004
Posts: 4
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I am also considering this with mine. 1968 + cranks are large journal. Your crank is cast nodular iron, and that is the only type for the 307. I would just find a good 350 block, as they are everywhere, although a 327 block of course, will work. Try to stay with a block earlier than 1986 unless you want to buy an adapter kit for a one to two piece rear main seal... This later block will have 4 tapped holes and a machined flat above the rear seal area.
The blocks are "basically" the same other then that with a common standard bore size of 4.001". Watch for: Dipstick on the side you want it. Starter motor bolt patterns (2 different size flywheels were used) Block with a casted number 10 over 20 by the camshaft bore is preferred as they have a high tin/nickel content which helps the block breathe and maintain a seal longer. Good Luck |
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