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Macs header for OS .91 VR-DF...? Does it fit?

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Old 11-10-2004, 06:14 PM
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Rudeboy
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Default Macs header for OS .91 VR-DF...? Does it fit?

Does anybody know if the Macs rear exhaust headers with the part numbers 3930/3931/3932 for Rossi .91 R, K & B .82-1.0 (for O-ring), O.S. .77-.91 VR (for O-ring), also fit the current .91 VRDF engine?

In other words: is the exhaust stub and the O-ring of the old VR series engines the same size as the current VRDF?
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Old 11-11-2004, 03:16 AM
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Default RE: Macs header for OS .91 VR-DF...? Does it fit?



Yep, a Rossi header application with O-sealing ring will fit all the aero exhaust stubs of the OS .65 to .91 VR series engines. But I noticed a slightly smaller ID of ROSSI headers compared to OS related headers in the past. You thus may need to remove material of the O-ring a little to accommodate the OD...

But what about MACS #3890, 3891, 3892 = O.S. .77-.91R (bolt on) ? Would be my first choice...

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Old 11-11-2004, 09:31 AM
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Default RE: Macs header for OS .91 VR-DF...? Does it fit?

Well, if they fit... same bolt spacing... sure.
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