I’ve never built a max effort 390 as I race 500” 427’s. But I’ve often thought a build like this would be cool. I envision it as follows: factory block cross bolted with 4.100 bore, 3.78 stroke. Pro port or FE Power heads. 16:1 compression, 2x4 sheet metal intake. 280-290 .950 solid roller, 8500-9000 rpm
Seems like 800hp would possible

Yes you can. I’m currently using one. I’m using an aviad spacer with a dry sump drive, so I had to machine that to fit. It may work with a stock 385 spacer. And of course verify tdc and timing marks

I love this. I have a soft spot for all things tunnel port….big ford, little ford, and Pontiac

This is another confirmation to CHECK EVERYTHING when building an engine.
I wasn’t getting any oil to the topside while priming on the stand. Discovered that the top
Longitudinal galley was not drilled all the way through. Easy fix, if caught early.
I know this is common on 460 Eliminator blocks. Anyone run into this with BBM yet?

 Very interesting to see how all the intakes performed. I’m racing, so I’ll be going for the dual four high rise, but the fact that you can bolt together these parts with lower single four or tunnelwedge style intakes and make over 800hp is astonishing.

No visible damage to anything else. Everything was in place intact on disassembly.

Yes, please post the pictures! I use my iPad for everything, and I tried converting the pictures to an acceptable format. But it’s still not working. I’m obviously doing something wrong. Thank you for the help.