Not strictly "done to my 'bolt" but will they ultimately find their way onto the engine.
I've been chasing header leaks on the SBC thanks to some cheap generic tube headers.

I traded my services with a friend in exchange for these,cast manifolds from a 289 c.u.

I've modified the RH side by removing the heat riser as it was fubar and also cut off the cast in generator mounting boss on the left as it would foul the alternator on mine and followed that up with a coat or two of POR-20 VHT silver paint.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.