Ported 906s

[oldkimmer]

These were built 30 years ago. I knew they were ported and polished. But I didn’t know the ports were coated in a black or dark blue epoxy type coating? The intake is totally coated inside. Must be some kind of an old racers trick? Kim

 

[HALIFAXHOPS]

My friend used to do that to make the porting smoother. Forgot what he used.

 

[oldkimmer]

My friend used to do that to make the porting smoother. Forgot what he used.

Thanks Hoppy. It hard as hell. Kim

 

[PRHeads]

The color isn’t really showing up for me, but I’ve seen it where the dye in race gas will stain an intake manifold.

Try a little carb cleaner and scotchbrite on it, see if it comes off.

If there’s epoxy in there, maybe the fuel dye stained the epoxy.