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04-05-2015 #1
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- Nov 2005
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- 213
Wanted to buy used R.A.R.E cast iron round port exhaust manifolds
Specifically looking for part number "RM-4 OSA". To fit an Edelbrock round port head in a 1967 Lemans/GTO. Thank you.
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04-06-2015 #2
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- Jun 2008
- Location
- Greenwood, Indiana
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- 271
Wanted to buy used R.A.R.E cast iron round port exhaust manifolds
How does the 77 Trans Am RM-4 differ from the RM-4 OSA? I have considered selling my set in favor of Tri-Y headers.
04-06-2015 #3
Registered User
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- Nov 2005
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- 213
Your collector size is smaller. Which equals less potential exhaust flow and power.
04-07-2015 #4
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- Jun 2008
- Location
- Greenwood, Indiana
- Posts
- 271
Wanted to buy used R.A.R.E cast iron round port exhaust manifolds
Ahh I remember now. I have the RM-4OS (OS=oversized). I knew I had the larger collectors but I didn't remember the p/n change.
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