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01-01-2005, 11:36:00 PM
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#1
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Veteran Member
Join Date: Dec 2004
Location: Sacramento, CA USA
Posts: 137
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Big block "peanut port" and oval port the same?
Are big block "peanut port" heads and oval port heads the same? Are all oval port heads the same?
__________________
1972 Rally Sport - 90% stock. Mild 350 with 3 Speed manual. Soon will have 454.
1967 Chevy C10 Truck - 90% stock. Fleetside longbed. Soon will have 454. Turbo 400. "Armstrong" steering (manual steering)
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01-02-2005, 12:26:00 AM
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#2
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Lifetime Gold Member
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,660
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No they are not the same.
Peanut port refers to the very small "round" ports used on late 70-mid 90's motors.
They are great for their intended usage, and can actually work well on a mild street BBC.
This photo shows the difference in a peanut port vs. an oval gasket.
This is an oval head:
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01-02-2005, 12:35:00 AM
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#3
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Lifetime Gold Member
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,660
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Ovals again:
Rectangular ports:
Note the closed chambers of the rectangular port heads... |
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01-02-2005, 12:43:00 AM
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#4
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Lifetime Gold Member
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,660
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Semi-closed chambers:
Open chambers:
BBC Vortecs:
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01-02-2005, 02:43:00 PM
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#5
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Veteran Member
Join Date: Dec 2004
Location: Sacramento, CA USA
Posts: 137
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Thanks for the great info. I'm pretty sure I have peanut port heads. Now I'm concerned if I get an Edelbrock intake for oval ports, the peanut ports will be smaller than the intake's ports, leaving a 'step' which will cause restriction.
Maybe I should just run the matching quad jet manifold until I upgrade the heads.
__________________
1972 Rally Sport - 90% stock. Mild 350 with 3 Speed manual. Soon will have 454.
1967 Chevy C10 Truck - 90% stock. Fleetside longbed. Soon will have 454. Turbo 400. "Armstrong" steering (manual steering)
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01-03-2005, 03:15:00 AM
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#6
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BANNED
Join Date: May 2001
Location: MO, USA!
Posts: 9,847
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Quote:
<font face="Arial,Verdana" size="2">Originally posted by CA72RS:
Thanks for the great info. I'm pretty sure I have peanut port heads. Now I'm concerned if I get an Edelbrock intake for oval ports, the peanut ports will be smaller than the intake's ports, leaving a 'step' which will cause restriction.
Maybe I should just run the matching quad jet manifold until I upgrade the heads. </font>
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Someone go ahead and correct me if Im wrong. Leaving the stock manifold on/unmatched ports on a edelbrock. I dont think there would be much a differnce in comparison.
I would think a edelbrock unmatched would be better than a stocker match cast iron intake. what you all think?
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01-03-2005, 12:02:00 PM
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#7
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Lifetime Gold Member
Join Date: Dec 2000
Location: Republic of Texas
Posts: 8,660
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The mismatch is not a problem. The "step" is not detrimental to performance.
The larger plenum and runner volume of the oval intake will better feed the motor.
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01-03-2005, 09:31:00 PM
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#8
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BANNED
Join Date: Jul 2001
Location: Columbia, MO, USA
Posts: 10,498
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Imho, the easiest way to tell to me is if they are wider then they are tall they are PP heads!
And if they are taller then they are wide, then they are large ovals!
And everybody know's how big and rectangular, rect's are...
And I'm not even going ta get inta the "ROVAL" deal that's like a 2/3rds tall, rect port...
pdq67
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