Hi all,
This just started happening on my SPF/460, and not all the time. It all started when my RH sidepipe support bracket broke (common, I'm told) welded it, broke again, finally welded a bent rod "spine" under it. My collector bolts were lose so I attempted to tighten as best I could. It's really tight in there. No breaks so far, but the backfiring has started. Only as I lift off on the throttle as I shift to the next higher gear.
Is this air getting into the exhaust? Do I have to redo the manifold gasket and collector gasket? Is there a quick fix?
Thanks
