What's the most power anyone has ever got out of a Tunnel Port ?

[e philpott]

How much power and at how many cubes is the most HP anyone has ever achieved out of the Tunnel Port ? 

[blykins]

Probably the best bang for the buck that I’ve done was a 696 hp 465ci Tunnel Port.

I’ve also done a 725 hp one, 511 cubes, with a solid flat tappet.

[e philpott]

is the 465 Gary's ? Both of those are stout for what they are and to me thats impressive for a cast iron factory head just as MBrunson TP on the dyno page

[TomP]

The heads that i raised the exhaust ports on made 660hp on a 454" with the factory single 4V and a sold flat tappet cam. That was with 5/16" stem 2.25 Hemi intake valves and 1.80" exhausts. The floors and top of the exhaust ports were welded up and the ports kind of looked like Blair's Super Stock heads. Sold those heads in 1990 and never seen them since or the 48 Ford truck the engine was in.

[1968galaxie]

Took a picture of an old Ford pickup several years ago at a car show.
Tunnel port 427 - interesting way up in Edmonton.

[TomP]

That could be it! I only ever saw the pictures of the truck the guy showed me, don't recall the flame but it was black and looked like something built in the 60's or 70's.

Though if it still has the heads (identifiable because the tops of the exhaust ports are welded up), those exhaust manifolds would cork up the raised ports. The port came to within 1/8" of the top bolt threads. I made header flanges that used a 5/16" bolt from the back like an MEL.