Early SB heads with recessed sparkplugs - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 12th, 04, 06:00 PM Thread Starter
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I have been wondering what the casting number was on the real early 265 SB head that had the recessed sparkplug.

Well It is a '56 , 265, -306!!

I was over on ebay tonight which I rarely ever do and went through the heads listed and Item # 2472918223 has a pic. of what I have been mouthing about with respect to there being only two production, what I call, closed chambered SB heads due to them having quench on both sides of the chamber.

The first is the old -461 b/c it is not recessed on the sparkplug side like the -462 and the other, later double-hump heads.

The second is the 265, -306 head I just found on ebay!!

Glad I found out the number b/c I knew they existed but NEVER could verify a casting number!!

If I recall right, the -306 should have about 130 cc intake ports and about 52 or so cc chambers.. But I may be off here??

It is really WAY too small for anything bigger then a mild stock bore, 283 but probably just about perfect for the 262, 265 and 267 motors!!!

Man, "even a blind sow finds an acorn every so often!!"


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post #2 of 3 (permalink) Old Apr 17th, 04, 09:46 AM
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Originally posted by pdq67:
If I recall right, the -306 should have about 130 cc intake ports and about 52 or so cc chambers.. But I may be off here??
Dunno about the port volumes, but the -306 heads had a 55.6cc chamber and 1.72/1.5 valves. It was the first "performance" V-8 head Chevy made, and was used on all 1x4 and early 2x4 '56 Corvettes. [img]graemlins/thumbsup.gif[/img]

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post #3 of 3 (permalink) Old Apr 17th, 04, 11:23 AM Thread Starter
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As alway's, I welcome your comments..

I posted too soon b/c I went back and looked the ebay post over again and the heads are marked with the familiar rect. with a big triangle on the top of it in the middle like the Power-Pack heads have..

I figure they are the very first Power-Pack heads but may be off here. If so they should have right at 137 or so cc intake ports..

I like the small combustion chambers b/c they help the little-bitty motors make good compression, but I had no idea they were that small, (55.6 cc's)...

I've got a set of -601's coming to me shortly so am starting to put together my 283.. I figure a set of 1.60" exhaust valves will do them nicely and I will just leave the 1.84" intakes alone except for some bowl work and dingle-berry casting flash removal.

Next step is picking up a little-bitty solid cam b/c they are hard to find at a reasonable price, imho...

Wish SSI or Elgin made a generic, modern -097 solid type cam... Or even smaller!!

Harold, Isky, CC and Erson are in the running, thanks to several of the guy's telling me about them as is the cam David Pozzi mentioned a long time ago..

I also wonder if I can find a set of 1.5" four tube, long headers for the little motor???

My 406SB has a 2101 Performer and 750 Q-Jet on it, plus I have an old cast-iron, 300hp/327 AFB intake and an adapter for an 1850, 600cfm Holley I have laying around on the shelf..

It's heavy, but the old AFB intake is a winner for a stock four barrel intake, imho...


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