What did you do to your truck today.The 3rd chapter

[67 twins]

Originally Posted by '68OrangeSunshine

Sweet. That's what I did on my 2005 292 build. I rebuilt the original L25 that came in the '68 Fremont Stepside when I bought it in 1973.
In 1977 I rebuilt a MY '67 block to .030-over,but all stock, or GM parts HD, if available. That engine fran 250,000 miles in 25 years.
OBTW, 1.84'' valves are stock for the SBC 307 iirc.

That's an interesting quote from Leo. I only have the first edition.
Lump Ports were the snazzy dog trick of the period.
About 20-something years ago, I was in Daytona talking with Twisted 6, who was promoting Lump Ports. But I must admit taking away those support columns, replacing them with countersunk flush bolts, epoxying airflow Lumps down, and getting machined set screws to fit the holes left on the top of the head, is a machinist's pipe dream [and your high bill.]

I will have to get the Second Edition.

Both of those quotes are in regards to a street driven truck. For street/strip or racing the lump ports are still the way to go. Unless of course you can afford to cut & weld two SBC heads together. But that takes deep pockets because everything has to change.