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Dorman 2.5 Inch Corvette Style Exhaust Manifolds

Price: $59.99 - $114.99
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  • Dorman 2.5 Inch Corvette Style Exhaust Manifolds
  • Dorman 2.5 Inch Corvette Style Exhaust Manifolds
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These "rams horn" cast iron manifolds were patterned off the 1962-63 327 Corvette. They feature the big 2-1/2" outlets and have provisions to accept original alternator type brackets. 

Use with 3 bolt header reducer/collector. Sold each, specify right or left. 

 

  1. Both the left and right sides include an alternator mount boss on the front of the manifold. If it is not required or needed, it can be machined off if necessary by the end user / installer.
  2. Ports measure 1-5/16” side to side and top to bottom Has sufficient material for porting/matching to your head.
  3. If using on original '62-'63 Corvette:
    • Right side manifold has provisions for hot air choke tube 
    • Generator mounts on passenger side (right side, 4.5" bolt centers)
    • Water tank mounts on drivers side (left side, 3.5" bolt centers)
9300327-L
  • Header Dimension A: 4.00"  Manifold Dimensions (GIF)
  • Overall Length: 20.25"
  • Overall Height: 6.50"
  • Center to Center: 3.50"
  • Collector Diameter: 2.50"
  • Notes: Center of head mounting bolt to bottom of collector flange is 4-3/16", to highest point of manifold is 2-3/4"

9300327-R

  • Header Dimension A: 4.0313"  Manifold Dimensions (GIF)
  • Overall Length: 21.00"
  • Center to Center: 4.50"
  • Collector Diameter: 2.50"
  • Inlet Size: 1.3125"
  • Notes: Distance from head mounting bolt to collector flange bottom is 4.1875". Center of head mount to highest point is 2.75".
Reviews for Item #: 9300327
REVIEWED BY 5 CUSTOMERS
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[ 13 of 13 customers found this review helpful ]
 

Good Value and Stock Appearance.

By Dave from Seattle, WA on 6/9/2010
Bottom Line: Yes, I would recommend this to a friend

These manifolds are great for a non-numbers matching build. They look stock, and flow better than the 2 inch manifolds. If you don't want the ground clearance and heat issues with headers, but want a better flowing exhaust, these are the manifolds to get. My only complaint is that the interior surface was a little rough for maximum flow, but they cleaned up nicely. Recommend graphite gaskets if you are bolting them to aluminum heads.

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Nice foriegn piece.

By MrHipp from Michigan on 9/5/2010
Bottom Line: Yes, I would recommend this to a friend

vette

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[ 2 of 2 customers found this review helpful ]
 

EXCELLENT

By Dan the Man from St. Cloud, MN on 10/6/2010
Bottom Line: Yes, I would recommend this to a friend

[...] Simply awesome;

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[ 3 of 3 customers found this review helpful ]
 

Great Manifolds

By Alabamahotrod1930 from Huntsville al on 3/17/2011
Pros:
Can Withstand Use, High-Performance, Powerful, Reliable
Car/Motorcycle Describe yourself:
Casual Driver
Best Uses:
Recreation
Bottom Line: Yes, I would recommend this to a friend

Great items for all small block chevys better than headers

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[ 5 of 5 customers found this review helpful ]
 

Nice quality great price

By Kurt from durand, il on 5/8/2011
Pros:
Can Withstand Use
Cons:
Limited Use
Car/Motorcycle Describe yourself:
Auto Enthusiast
Best Uses:
Recreation
Bottom Line: Yes, I would recommend this to a friend

Really only took a 1/2 hr. to sawsall off one of the alternater mounts, and grind/file finish. Why the casting vendor doesn't have one offered without the mount is beyond me-seems silly. Appear to be great quality, and some testing shows these are as good as tube headers.

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Displaying Reviews 1-5 of 5
 

Questions and Answers for Item #: 9300327

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7 Questions | 6 Answers
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Q:

will these fit a 55 chev with a 350 small block

Asked on 1/19/2011 5:51:45 AM by don from bishops falls nl

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Q:

I am wondering if these will pass `pure stock` tech inpection for dirt track.

Asked on 3/16/2011 1:53:28 AM by Ron the Roofer from Prescott Arizona

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Q:

will these fit on 74 Corvette 5.7 engine with A/C?

Asked on 10/20/2011 1:13:12 PM by Ron the Roofer from Prescott Arizona

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Q:

would these handle a high compression stroker motor for street use. just tired of changing headers.

Asked on 11/24/2011 4:51:05 AM by Ron the Roofer from Prescott Arizona

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Q:

Will these exhaust manifolds fit in a 61 apache with a 350 sb?

Asked on 12/27/2011 4:46:15 PM by jesse jessman from edinburg,tx

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Displaying Questions 1-5 of 7

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2.5 Inch Corvette Style Exhaust Manifolds
Item #:
9300327
Item Details:
Both L and R sides include alternator boss
 
(5 Ratings)
  Show Specifications
  • 9300327-L
    Header Dimension A
    4.000"
    Overall Length
    20.250" (20 1/4")
    Overall Height
    6.500" (6 1/2")
    Center to Center
    3.500" (3 1/2")
    Collector Diameter
    2.500" (2 1/2")
    Material Type
    Iron
    Finish
    Natural
    Sold in Quantity
    Each
    Notes
    These do NOT include gaskets or bolts. Center of head mounting bolt to bottom of collector flange is 4-3/16", to highest point of manifold is 2-3/4".
  • 9300327-R
    Header Dimension A
    4.031"
    Overall Length
    21.000"
    Center to Center
    4.500" (4 1/2")
    Collector Diameter
    2.500" (2 1/2")
    Inlet Size
    1.312" (1 5/16")
    Material Type
    Steel
    Finish
    Natural
    Sold in Quantity
    Each
    Notes
    These do not include gaskets or bolts. Distance from head mounting bolt to collector flange bottom is 4.1875". Center of head mount to highest point is 2.75".
2.5 Inch Corvette Style Exhaust Manifolds - Complete Pair
Price:
$114.99
PR
In Stock
Item #:
9300328
Open Kit Components
- Selection of individual components may be necessary for kit purchase.
Kit Components
2.5 Inch Corvette Style Exhaust Manifolds
Item #:
9300327
Item Details:
Both L and R sides include alternator boss
Side: L
1
  Show Specifications
  • 9300327-L
    Header Dimension A
    4.000"
    Overall Length
    20.250" (20 1/4")
    Overall Height
    6.500" (6 1/2")
    Center to Center
    3.500" (3 1/2")
    Collector Diameter
    2.500" (2 1/2")
    Material Type
    Iron
    Finish
    Natural
    Sold in Quantity
    Each
    Notes
    These do NOT include gaskets or bolts. Center of head mounting bolt to bottom of collector flange is 4-3/16", to highest point of manifold is 2-3/4".
2.5 Inch Corvette Style Exhaust Manifolds
Item #:
9300327
Item Details:
Both L and R sides include alternator boss
Side: R
1
  Show Specifications
  • 9300327-R
    Header Dimension A
    4.031"
    Overall Length
    21.000"
    Center to Center
    4.500" (4 1/2")
    Collector Diameter
    2.500" (2 1/2")
    Inlet Size
    1.312" (1 5/16")
    Material Type
    Steel
    Finish
    Natural
    Sold in Quantity
    Each
    Notes
    These do not include gaskets or bolts. Distance from head mounting bolt to collector flange bottom is 4.1875". Center of head mount to highest point is 2.75".
 
(1 Rating)
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