Difference btween MFR pport housings and RB housings?
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Difference btween MFR pport housings and RB housings?
As stated, what is the big difference? I have heard that the SCCA frowns upon the RB ones....
#3
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On the intake side, the MFR have a flanged connection to the intake manifold instead of a spigot, and the port goes in "straight" instead of angled in. (Of course the MFR is cast this way, it's not a modified stock part) I forget port timing difference.
MFR housings have relatively mild exhaust port timing, opening slightly *later* than the street parts. The exhaust flange is different from OEM as well.
I have also "heard" that the chrome is directly on aluminum, no sheet metal insert, so lightweight apex seals are mandatory. No iron seals.
MFR housings have relatively mild exhaust port timing, opening slightly *later* than the street parts. The exhaust flange is different from OEM as well.
I have also "heard" that the chrome is directly on aluminum, no sheet metal insert, so lightweight apex seals are mandatory. No iron seals.
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yep the exhaust ports open later, and close later.
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cheaper than a stock posrche 911 piston and sleeve kit....
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