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Osco or Barrs?
- Thread starter firepiper
- Start date
knotheadcharters
Member
- Joined
- Nov 16, 2005
- RO Number
- 19571
- Messages
- 100
I'd say doesn't matter. They are both inexpensive. If replaced every 2-3 years you should have no problems.
- Joined
- May 13, 2002
- RO Number
- 8583
- Messages
- 104
I used Barr on my Pleasure Craft 351. The original eq. and Osco manafolds have 2 bolt holes per cylinder but the Barr came with only one bolt hole per cylinder. Also, when I remove the spark plugs I have to remove the Barr manafold first, I did not have to do that with the OEM manifolds. I have no experience with the Barr on GM engines. I would not use Barr again. Good Luck, Jerry
- Joined
- Aug 1, 2002
- RO Number
- 9587
- Messages
- 1,036
I too, prefer Osco. Never had any problems with them.
Some years ago,the different manifold MFG consolidated into just a couple foundries but keeping their molds and names.There are a few different styles and different exhaust diameters. Just match up the risers to the manifolds. There's very little difference between risers as long as they match up to your original configuration.
The manifolds are where there are slightly more differences. I believe the 'Sierra' style has 'semi-tuned' exhaust passages where others just run into the exhaust chamber of the manifold.
This being some years back, I'm not sure where these 'manufactures' have their casting made NOW!
The manifolds are where there are slightly more differences. I believe the 'Sierra' style has 'semi-tuned' exhaust passages where others just run into the exhaust chamber of the manifold.
This being some years back, I'm not sure where these 'manufactures' have their casting made NOW!
Next time you get your osco or whatever,look at the castings. Some are also lettered barr. The only thing Google brings up is sierra int and barr.
The most important aspect of manifolds besides uniform wall thickness, are the mating surface between the exhaust and water jacket. That's where 99% of leaks come from.
The most important aspect of manifolds besides uniform wall thickness, are the mating surface between the exhaust and water jacket. That's where 99% of leaks come from.
quote:
The most important aspect of manifolds besides uniform wall thickness, are the mating surface between the exhaust and water jacket. That's where 99% of leaks come from.
And the exhaust castings that Crusader sells all come with a notice that says make sure you deck the gasket-mating surfaces with a flat metal file until it is clear the file is removing metal evenly from all of the surface. Iast replacement, I believe it took about 20 + minutes with a new file to deck each elbow. Once you start it's easy to see the irregularities that may not have been previously obvious. Also , no matter which mfgr you go with , there is often excess flashing inside the passages that can be removed or reduced with a littl patience.
FWIW- My 1st choice is to go with the engine OEM mfgr's replacement exhaust castings. No matter who actually may make those, they ...may.. be cast to somewhat different spec than aftermarket. My 2nd choice would likely be Osco aftermarkets.