BB Closed Chamber CC and Intake CC Info - Team Camaro Tech
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post #1 of 6 (permalink) Old Mar 8th, 01, 06:05 PM Thread Starter
Join Date: Apr 2000
Posts: 21,341

Can anybody tell me what the combustion chamber CC and intake port CC is for this list of BB heads?
Thanks in advance. pdq67

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post #2 of 6 (permalink) Old Mar 9th, 01, 05:49 AM
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Join Date: Jun 2000
Location: Houston, Texas
Posts: 193

I don't know the CC of the ports, but I did find this:
290=Oval port, 69&70, 2.06/1.72 valves 100.967cc chambers, tapered spark plugs.
063=same as 290 with flat plug seats.
215=same as 063 except used in 67&68.
802=same as 215 except no temp sending unit boss.
390=Oval port, 67, 2.06/1.72 valves, 98.427cc chambers.
702=same as 390 used in 66.
260=couldn't find it.
213=couldn't find it.
206=Oval port, 65&66, 2.06/1.72 valves, 97.167cc chambers, first production markIV oval port head.

This info came from "Chevrolet by the Numbers" by Alan Colvin.
Hope this helps,

67 RS/SS 350 700R4
69 SS clone unfinished
72 454 Weekend Racer
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post #3 of 6 (permalink) Old Mar 9th, 01, 02:56 PM Thread Starter
Join Date: Apr 2000
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Thx for the info.

Would a good set of bare -781's be a good swap for a good set of bare closed chambered oval's??? You know, no cracks and usable.

I'm thinking about playing around with a flat top piston, high compression big block ta see if theory actually works. pdq67

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post #4 of 6 (permalink) Old Mar 9th, 01, 03:09 PM
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Join Date: Oct 1999
Location: Payson,Az. U.S.A.
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#290's as cast (referring to large oval ports only), with the 5/8" small spark plugs, have the largest intake port runner volume at an NHRA maximum of 262c.c.'s.

I have a good pair.

Everything I own is for sale. What were you looking for?
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post #5 of 6 (permalink) Old Mar 9th, 01, 06:02 PM
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That's nice to know, I've got a set of 290's on my 396, and I was told they came off of a 70' Corvette, 454 motor, LS5, and that they are about the best iron, oval port, BB heads you can find......KZ

John D. Smith
69' SS/396 CLONE!
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post #6 of 6 (permalink) Old Mar 10th, 01, 04:51 AM Thread Starter
Join Date: Apr 2000
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You want ta do a swap, my bare -781's for your bare -290's or is it considered an even trade?

Only problem is the shipping charges. Get back to me. pdq67

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