Inliners International Forums General Discussion Hi Performance Strange modified head on eBay

In an "Accessory Trial" in the March 1952 Motor Trend, Griff Borgeson reported that the Rajo head increased the horsepower from stock 80.8 to 101.1. - do lump ports give a 25% increase? It had just the additional carb which could be adjusted to come in at any speed.
Price $169.50

Will

If your meaning the bolt-in style lumps, then yes, we measured a considerable amount more than 25% HP gain with them in the later siamese heads, when compared to a stock small valve head w/o lumps vs. a large valve head w/lumps, both heads being large chambers. There might be some gain with the older heads trying to put lumps in them, but you have the limitation of still having a small port opening.

i am interested in whether "lumps" can significantly improve flow, horsepower, and torque in a GMC 302 or 270-H head. Those ports should be large enough to establish a difference . . . or not.

God's Peace to you.

d
Inliner #1450

The Siamese branch in the older head is very much “T” shaped and quite different from the “V” in the later head and the builders helping me didn’t think a lump would provide any benefit there and that altering the short side turn radius to resemble that which is on the lumps would be best. They did however suggest a “turtle” on the back wall might be something the flow bench will like. On Saturday I plowed in from the top of a head and milled a NPTF dryseal pipe thread and would give it about a 70% chance of sealing as is. Drilling the holes and then a bit of brazing on the inside lip of the hole to increase the thread surface a few turns before milling should put that at 100% so a Rajo type conversion looks pretty easily doable.

With the welding processes out there now, would it be unreasonable to make and weld in a lump or splitter to make more of a "V" than the "T" that is stock?

I figured that would be one of the primary benefit of that mod; the other being a more or less straight shot at the valves.

Do we know who got this head?
Curt keep us up on how you are doing on your head. Beater

One more reason to make the 2010 Inliners Convention in Boerne (Bernie) Texas in June. Mr. Palmini will be there along with his scrapbook and pictures of his modified head, with which he drilled some serious bent motors back in the day. Mr Palmini is a gentleman of the first order and I believe he will give a short dissertation that will enlighten us all. He also owned Spalding Cams prior to selling the Company to Mr. Ed Iskenderian. Most interesting man. I'm sure there's more to the story.
SOB

SOB, Is there a chance that the "dissertation" could be videoed? It would be great to have this kind of information available on this site. I would like to get to the convention but right now I don't think it will happen. I hope someone will do an indeph interview of MR. Palmini for the 12 Port News. Beater

Bill
I also think it would be fantastic if the tech talks could be put on tape, as I won't be able to make it to Texas this year. I have a previous planed weekend in Colorado the same dates. I will miss seeing everyone but can't be in two places at the same time.