Good to know! If they don’t help out then I’m not putting time in to it. I’m polishing the chambers largely to help with detonation but at the end of the day these heads are very limited for marine use. I’m strongly considering ditching the Victor Jr intake for an air gap. I don’t think these heads can really take advantage of the single plane.

Thanks, Joe. I’ve read that article a few times before but it’s a good refresher. My chambers look identical to his at +7cc so it looks like I’m bringing the Cr right back to where it was with the -1 flat tops at 9.47:1 with the new -6 pistons. The article mentioned putting a Weiand single plane on it but didn’t mention which one.

It was interesting how the port work on the exhaust side had near zero benefit.

Very wise intake choice, dynoed a 502 a few months ago w edelbrock 290 gm motorsports heads, afrs and torque were god awful w a vic jr, switched to a pos edelbrock performer and picked up 30/40 ft lbs tq just about everywhere plus a little hp. Switched THAT to gms version of a performer rpm and picked up MORE tq and hp everywhere and afrs were much closet. If your running a std firing cam, #3 is the leanest cylinder w your intake if you start reading plugs fwiw from what we saw, Smitty