[petehoovie]

Originally Posted by ken-r-mer

Single plugs and the plug holes are in the center of the block, not high up as in your pic. I'm running a Tom Roberts (TR) blower setup with a pr of the new Stromberg (BIG) 97's, so ideally looking for CC's in the mid to upper 70's and the CR in the low 8's max. The block I have has a 4" crank, 3 5/16" bore, Isky 77B (mild) cam, beefed up main caps and the block is relived. My alternative is Navarro blower heads. The Kong's show no signs of wear, head bolt seats are pristine as well as the underside. My guess is newer production run, as no signs of aluminum oxidation.

This?