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04-27-2006, 01:52 PM
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#1 |
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Dork For Days
Join Date: Aug 2005
Location: Dallas
Posts: 407
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Easy/Dumb question about heads
Okay, I'm pretty new to classic Chevy trucks,
 so please bare with me on this one.  '72 C20 402 BB - all factory original Which heads do I have - oval or rectangular port? Told you it was an easy one!  I'm asking 'cause I'm heading to a huge swap meet ("Pate" for you local guys) tomorrow and thought I'd poke around for some headers and an intake for my truck.
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1972 C20, 402/700R4 - My first classic truck, bought in September 2005. 85% transformed from "Farm" to "Cool" status!  1970 Dodge Challenger 440, 4sp (my other toy) 12.67 @ 117 MPH, with a pathetic 2.022 60' 2007 Dodge Charger SRT-8 2008 Cadillac CTS All-American garage, baby! Last edited by MrC1; 04-27-2006 at 01:53 PM. |
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04-27-2006, 02:29 PM
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#2 |
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'68 C-20 396 CST CC
 
Join Date: Mar 2005
Location: Spokane, WA
Posts: 454
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Re: Easy/Dumb question about heads
I could be wrong about this, but I think the square ports only came on hi-performance engines, like Corvettes and Camaros with mechanical lifters. I've never heard of a rectangular port BB installed in a truck--an original one anyway.
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68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES  01 Jetta Turbo Daily Driver  84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico
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04-27-2006, 02:46 PM
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#3 |
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Registered User
Join Date: Jul 2005
Location: DFW
Posts: 463
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Re: Easy/Dumb question about heads
I believe that's correct, oval ports were for "street" engines.
Woot, Pate! I'll be there, got a wad of dough burning a hole in my pocket! Last edited by mplex2000; 04-27-2006 at 02:47 PM. |
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04-28-2006, 03:09 AM
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#4 |
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A little east of nowhere
Join Date: Feb 2006
Location: LaBroquerie,Manitoba Canada
Posts: 168
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Re: Easy/Dumb question about heads
If it is orginal, they should be #241 oval port. Rectangle ports are found on the likes of 375hp 396, 425, 435hp 427's, 450hp 454. Don't nail me if I missed a couple, my memory is a little rusty.
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68 C10 250 4spd 69 C20 327 4spd 69 910 250 3spd 80 K10 350 4spd 76 C60 366 5spd school bus "THERE'S NOTHING YOU CAN BREAK THAT SOMEONE CAN'T BE PAID TO REPAIR" |
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05-05-2006, 12:18 AM
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#5 |
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Registered User
Join Date: Apr 2006
Location: 93420
Posts: 98
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Re: Easy/Dumb question about heads
Same question, but I have 70 GMC with 396. I am assuming the Oval Port as well.
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05-05-2006, 12:59 AM
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#6 | |
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'68 C-20 396 CST CC
Join Date: Mar 2005
Location: Spokane, WA
Posts: 454
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Re: Easy/Dumb question about heads
Quote:
 WELCOME TO THE BOARD!! I don't have any data to back any of this up, but I think back in the day they only put those high performance motors in the Chevrolet cars. The trucks were more utalitarian (sp?). I don't see why it would be any different for engine installs into the GMC line. Somebody might chime in and say, "Spanky Yunik raced a '67 shortbed GMC and someone's uncle special ordered one just like it with a 375 horse 396 with a speed warning indicator and A/C..." but I doubt it.
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68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES 01 Jetta Turbo Daily Driver 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico
Last edited by thecatseye66; 05-05-2006 at 01:04 AM. |
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05-05-2006, 01:41 AM
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#7 |
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Registered User
Join Date: Apr 2006
Location: 93420
Posts: 98
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Re: Easy/Dumb question about heads
thanks Catseye
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05-05-2006, 01:55 AM
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#8 | |
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'68 C-20 396 CST CC
Join Date: Mar 2005
Location: Spokane, WA
Posts: 454
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Re: Easy/Dumb question about heads
Quote:
 Your welcome bro!  How long have you had the 70 396?
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68 C-20 396/TH400 CST Custom Camper NOW W/DISC BRAKES 01 Jetta Turbo Daily Driver 84 Yamaha Virago 700 - Alaska to Florida Via Maine & Mexico
Last edited by thecatseye66; 05-05-2006 at 01:58 AM. |
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05-06-2006, 03:33 AM
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#9 | |
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A little east of nowhere
Join Date: Feb 2006
Location: LaBroquerie,Manitoba Canada
Posts: 168
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Re: Easy/Dumb question about heads
Quote:
__________________
68 C10 250 4spd 69 C20 327 4spd 69 910 250 3spd 80 K10 350 4spd 76 C60 366 5spd school bus "THERE'S NOTHING YOU CAN BREAK THAT SOMEONE CAN'T BE PAID TO REPAIR" |
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05-06-2006, 01:36 PM
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#10 |
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Junior Member
Join Date: Mar 2005
Location: Wilmington DE
Posts: 218
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Re: Easy/Dumb question about heads
Your heads are oval port .. Just rebuilt the motor in my 72 bb and the casting # on the head is 6272292.. If you pull the valve cover and get the cast# we could tell you what you got for sure . I would be interested to know if it is the same as mine ??
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05-06-2006, 10:11 PM
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#11 |
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Senior Member
Join Date: Dec 2004
Location: Southern Pines NC
Posts: 3,853
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Re: Easy/Dumb question about heads
"truck motors" oval...........
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05-13-2006, 11:04 AM
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#12 |
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Registered User
Join Date: Apr 2006
Location: 93420
Posts: 98
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Re: Easy/Dumb question about heads
CatsEye - Father-in-law's truck I am fixing up
 . Been working on it for a couple months , but it is 180 miles from me - so it is slow going until I get it home. Still have a question though - anytime I try to get info on gaskets headers always comes up with ROUND or SQUARE options. So is OVAL really ROUND when looking for parts??? I see the cars are usually ROUND, but not HiPo.Thanks! |
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05-14-2006, 12:02 PM
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#13 | |
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A little east of nowhere
Join Date: Feb 2006
Location: LaBroquerie,Manitoba Canada
Posts: 168
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Re: Easy/Dumb question about heads
Quote:
__________________
68 C10 250 4spd 69 C20 327 4spd 69 910 250 3spd 80 K10 350 4spd 76 C60 366 5spd school bus "THERE'S NOTHING YOU CAN BREAK THAT SOMEONE CAN'T BE PAID TO REPAIR" |
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05-14-2006, 12:49 PM
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#14 |
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Registered User
Join Date: Apr 2006
Location: 93420
Posts: 98
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Re: Easy/Dumb question about heads
Thanks Karl - perfect - just the answer I needed!
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