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01-15-2009, 11:45 AM
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#1 |
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Registered User
Join Date: Oct 2007
Location: oklahoma
Posts: 457
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I.D.ing a big block head......
O.K. first thing first i have did a search and ran across a forum from this site which did give me a little bit more knowledge.....
My question is that my head I.D. #346236 shows different cc ratings on different websites.... so which is it 113cc or 120cc??? Did the "peanut" port exist in a 120cc or only a 113cc??? website-------------rating MORTEC------------120cc MINUIT10.net-------113cc NASTYZ28----------113cc CHEVYCARCLUBVIC--120cc 67-72CHEVYTRUCKS---- ?????? what i have learned so far is that these heads are the "peanut" port heads, which i understand are good for under roughly 4500rpm at making there power, that is fine with me, since the truck is going to play in the mud. and as always thanks for any help.
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Lug Nuts Classic Rides. (Bodywork, small fab, and Restorations) Perry, Ok. We're just two guys, trying our best. 72 cheyenne super https://67-72chevytrucks.com/vboard/...d.php?t=811512 55 chevy truck http://67-72chevytrucks.com/vboard/s...d.php?t=840174 |
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01-15-2009, 03:20 PM
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#2 |
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Registered User
Join Date: Oct 2007
Location: oklahoma
Posts: 457
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Re: I.D.ing a big block head......
have i stumped you people?????
 or do i not have enough info.....i am still finding websites giving different CC ratings 
__________________
Lug Nuts Classic Rides. (Bodywork, small fab, and Restorations) Perry, Ok. We're just two guys, trying our best. 72 cheyenne super https://67-72chevytrucks.com/vboard/...d.php?t=811512 55 chevy truck http://67-72chevytrucks.com/vboard/s...d.php?t=840174 |
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01-15-2009, 03:33 PM
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#3 |
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Registered User
 Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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Re: I.D.ing a big block head......
Split the difference between the two so let's call it 116.5, no?
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01-15-2009, 04:42 PM
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#4 |
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Recovering 67-72 Addict
Join Date: Oct 2000
Location: North Bend, WA
Posts: 1,788
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Re: I.D.ing a big block head......
I've had the same frustration with BBC heads and published data. I was told once that there was quiet a bit of variability and the only way to know for sure is to cc them. Drop, drop, drop....
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68 Short Fleet 4x4; 427; BTO Level 3 700R4; NP205; Dana 60 front and rear; 4" lift with 35's; Disc brakes; AGR variable ratio steering; factory bucket seats; factory tach and tilt. "Friends call me cruzer cuz I like fast cars and fast women" |
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01-15-2009, 11:24 PM
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#5 |
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I make Models
Join Date: May 2005
Location: Bucks, PA
Posts: 626
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Re: I.D.ing a big block head......
pics of the comb. chambers would help in identifying.......also are they square ports or ovals on the intake side???
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01-16-2009, 12:00 PM
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#6 | |
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Registered User
Join Date: Oct 2007
Location: oklahoma
Posts: 457
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Re: I.D.ing a big block head......
Quote:
"clay68c10"- You can do a quickie cc measurement. Get a small piece of plexiglass and a generic syringe from the pharmacy. Put a small hole in the plexiglass, use a little bit of grease to seal it to the combustion chamber and see how many syringes it takes to fill it. It may not be super accurate, but it'll give you a good idea what you've got. ^ good idea i will try this experiment......
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Lug Nuts Classic Rides. (Bodywork, small fab, and Restorations) Perry, Ok. We're just two guys, trying our best. 72 cheyenne super https://67-72chevytrucks.com/vboard/...d.php?t=811512 55 chevy truck http://67-72chevytrucks.com/vboard/s...d.php?t=840174 |
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01-16-2009, 12:37 PM
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#7 |
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Registered User
Join Date: Dec 2007
Location: Nanaimo B.C.
Posts: 604
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Re: I.D.ing a big block head......
I looked through my books and one has the 346236 cc as 112.0 the vales are 2.06/1.72 the engine is a 454 from 1975-76 truck very small port .This info is from HP books how to rebuild your BB Chevy I found the info in the parts ID section under the cylinder-head casting numbers
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I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!! |
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01-16-2009, 09:45 PM
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#8 |
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I make Models
Join Date: May 2005
Location: Bucks, PA
Posts: 626
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Re: I.D.ing a big block head......
if the heads are off of the vehicle then yes you can tell by looking at the CC what they are......
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01-15-2009, 11:53 PM
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#9 |
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Senior Member
Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,990
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Re: I.D.ing a big block head......
You can do a quickie cc measurement. Get a small piece of plexiglass and a generic syringe from the pharmacy. Put a small hole in the plexiglass, use a little bit of grease to seal it to the combustion chamber and see how many syringes it takes to fill it. It may not be super accurate, but it'll give you a good idea what you've got.
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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01-17-2009, 01:09 PM
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#10 |
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Registered User
Join Date: Apr 2006
Location: SoCal
Posts: 70
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Re: I.D.ing a big block head......
I just had a set of these rebuilt for my 396 and the combustion chambers are 120cc. Hope this helps.
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69 Chev C20 396 T400 Dana 60 3.54 A/C Daily Driver - Stolen 67 Chevy C20 CST |
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