opinions on best SBO heads?
May 22nd, 2007, 11:39 AM
#1
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opinions on best SBO heads?
I've read that the #5 heads are considered best overall SBO heads, but wouldn't #6 or #7 be better because of their larger valves (same 64cc chambers)? Do they all flow the same? I'm still very new to the world of Oldsmobile.
- GoldOlds
- GoldOlds
May 22nd, 2007, 07:11 PM
#2
5 or 5a heads from the late 60's early 70's are the best according the Dick Miller.
6 heads are good too, but are rare, they were used in Canadain cars.
The flow between 5, 6 and 7 are close. If there is no little "a" like 5a and 7a, this means they have the hardened valve seats so they can run unleaded gas.
You can also use Big Block heads on the Olds Small block. But opening up the cc cambers too much, will cause a loss in compression, thus a loss in power.
The trick is, take a set of BBO heads, have them milled to .010, and you have flow of BBO heads with a SBO combusion chamber
6 heads are good too, but are rare, they were used in Canadain cars.
The flow between 5, 6 and 7 are close. If there is no little "a" like 5a and 7a, this means they have the hardened valve seats so they can run unleaded gas.
You can also use Big Block heads on the Olds Small block. But opening up the cc cambers too much, will cause a loss in compression, thus a loss in power.
The trick is, take a set of BBO heads, have them milled to .010, and you have flow of BBO heads with a SBO combusion chamber
May 23rd, 2007, 03:22 PM
#4
A 7 head will run today's fuel fine, but it will cause problems in the future.
Go to your local auto parts store and buy a bottle of lead. About 3 or 4 bucks a bottle, but you gotta run it iat every fill up
Go to your local auto parts store and buy a bottle of lead. About 3 or 4 bucks a bottle, but you gotta run it iat every fill up
May 26th, 2007, 10:26 AM
#5
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- GoldOlds
May 26th, 2007, 12:45 PM
#6
There are Olds heads that are non adjustable, but I'm pretty sure they were pre 1968. '68 and up, are different
May 27th, 2007, 12:15 PM
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May 27th, 2007, 05:49 PM
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May 31st, 2007, 12:46 PM
#9
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In the Performance section of this web site, there was an article (Valvetrain Geometry) about using shims to adjust the height of the rockers if you milled the heads or went with longer rods. So it can be done.
May 31st, 2007, 01:55 PM
#10
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The heads on the olds motors have non-adjustable rocker arms. You could shim under the rocker hold down stems if needed. However, the thickness of shim added would be less than the amount of material that was removed from the head. I'm not sure what that ratio would be.
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