casting numbers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cstm68 · 03-18-2007, 01:41 AM

so i looked up the numbers of an old set of heads i had in the garage and it my sorce says that they are from a 68 307/327 70cc chamber but does not tell the valve size what does the 70 cc chamber mean ???

the number is 3911032

**WorkinLonghorn** · 03-18-2007, 02:14 AM

http://www.nastyz28.com/sbchevy/sbch.html
Looks like they are to a 307 or 350 from '68-69 with the small 1.72 intake and 1.5 exhaust valves. A 70 cc or 76 cc chamber refers to the size of the combustion chamber in the head where the initial combustion takes place.

03-18-2007, 01:41 AM	#1
cstm68 Registered User Join Date: Jan 2007 Location: shoreline, wa Posts: 1,565	casting numbers so i looked up the numbers of an old set of heads i had in the garage and it my sorce says that they are from a 68 307/327 70cc chamber but does not tell the valve size what does the 70 cc chamber mean ??? the number is 3911032

03-18-2007, 02:14 AM	#2
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,883	Re: casting numbers http://www.nastyz28.com/sbchevy/sbch.html Looks like they are to a 307 or 350 from '68-69 with the small 1.72 intake and 1.5 exhaust valves. A 70 cc or 76 cc chamber refers to the size of the combustion chamber in the head where the initial combustion takes place. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.



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