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Old 04-27-2007, 07:59 PM   #1
speedway
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Default GMC inline 6 where to start for killer motor

What motor to I want for starting base to build a hot 6 banger. Do I want a 302 cu. in. GMC. If so how do I I.D. that motor. Any website to check out for more info. Found what the owner claimed was a 51 GMC a few blocks from my shop for 50$. Not sure of the cu.in. Have a 57 chevy car complete motor and powerglide w a "848" head, would that be a good starting point?. If i remember correctly all the hot 6 cyl. drag cars in the 60's were GMC powered. Thanks
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Old 04-27-2007, 10:03 PM   #2
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Default Re: GMC inline 6 where to start for killer motor

GMC made it easy; the engine size was stamped into the flat machined pad next to the distributor hole. 302s didn't debut until '52.
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Old 04-27-2007, 10:12 PM   #3
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Default Re: GMC inline 6 where to start for killer motor

stovebolt.com and inliners.org are good places for info
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Old 04-28-2007, 07:33 AM   #4
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Default Re: GMC inline 6 where to start for killer motor

I put a GMC 228 cu motor out of a 32 truck into a 52 Chevy truck last year, Had to move the radiator forward and build a new front motor mount because the GMC motor is about 1 1-2 or 2 inches longer than the Chevy motor. Other than that, the rest bolted right up. If I could have located a good 270 or 302 I would have kept the truck with a 6 cylinder in it. Instead, I put a 502 in it.
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Old 04-28-2007, 07:43 AM   #5
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Default Re: GMC inline 6 where to start for killer motor

I can hook you up with a 270 but sold my 302's. They are hard to find. I have a good 228 also. But maybe your neighbor's engine will work out for you.
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Old 04-28-2007, 09:37 PM   #6
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Default Re: GMC inline 6 where to start for killer motor

270s seem more common than 302s, but I saw three 302s in a guy's shop today. They can be found. Look for an old GMC truck, including the WWII military types. They are out there.
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Old 04-28-2007, 09:40 PM   #7
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Default Re: GMC inline 6 where to start for killer motor

302 was a v6, not inline...whactha trying to do?
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Old 04-28-2007, 09:46 PM   #8
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Default Re: GMC inline 6 where to start for killer motor

Have you read this thread????????

http://www.jalopyjournal.com/forum/s...ad.php?t=18390
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Old 04-28-2007, 09:49 PM   #9
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Default Re: GMC inline 6 where to start for killer motor

Ya...did ya read the title?
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Old 04-28-2007, 09:58 PM   #10
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Default Re: GMC inline 6 where to start for killer motor

Quote:
Originally Posted by 3Mike6 View Post
302 was a v6, not inline...whactha trying to do?
Right.

GMC's 302 was an inline.

Ford and Chevy have both made V-8 302s.

Chevy made a V-8 305.

And GMC once made a V-6 305, which is probably the motor you are confusing with this discussion.
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Old 04-28-2007, 09:59 PM   #11
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Default Re: GMC inline 6 where to start for killer motor

Damn, you're probably correct...that 305 was the "offset" engine...oh well, color me "off topic" then
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Old 04-28-2007, 10:03 PM   #12
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Post Re: GMC inline 6 where to start for killer motor

Quote:
Originally Posted by 3Mike6 View Post
302 was a v6, not inline...whactha trying to do?
The 302 was a 4" bore x 4" stroke inline six, same basic block as the 228, 248, and 270". I've also seen one each of a 236 and 256, but those are not common. About 1/2 of all the 302's from '52 to '59 were in military vehicles, like the duece and a half 6x6 trucks. Commercial versions were in 2.5 and 3 ton rated trucks.

The 270, and when it was introduced, the 302, were the hot upgrade motor for Chevy sixes in the ten or twelve years right after WWII. They were often raced, as a heavy overbore on a 270 would yeild 292", and the 302 could bore to 320" without stroking it. At the time, you would really have to pour some work and machining tricks into a 255" Merc flattie to get that kind of displacement. They were sometimes used in customs, such as the Larry Earnst Chevy.

With the addition of a Wayne 12 port head, the larger GMC's were capable of producing one HP per cube in the early '50's, and could hold their own against the famed Offy's in circle track racing, where they were known as the "Farmer's Offy".

The later series of slow revving V-6's used in trucks started with a 305", and went up from there. I don't recall ever hearing about these being raced.

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Old 04-28-2007, 10:13 PM   #13
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Default Re: GMC inline 6 where to start for killer motor

what was the bore and stroke of the 270? and what is the 235? b.s.? too
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Old 04-28-2007, 10:13 PM   #14
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Default Re: GMC inline 6 where to start for killer motor

Were there Wayne 12 ports avialble for the inline 6's? I thought they were a rare commodity for the Ford FHV8?
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Old 04-28-2007, 10:31 PM   #15
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Default Re: GMC inline 6 where to start for killer motor

Quote:
Originally Posted by 3Mike6 View Post
Were there Wayne 12 ports avialble for the inline 6's? I thought they were a rare commodity for the Ford FHV8?
Wayne 12 ports were for chevy and gms inline sixes.How would "12 PORTS"work on 8 cylinders???Think about it,intake +exhaust= 2 valvesx8 cyl=16 ports
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Old 04-28-2007, 10:43 PM   #16
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Default Re: GMC inline 6 where to start for killer motor

Well, I saw this '32 Arun eninge Ford, some rare thing on Ebay...touting the engine and a ""12 port wayne" setup., as I was directed to the auction, prior comments led me to believe it was smoe super rae FH V8 thing...

I saw the two sets of "3" exhaust manifold ---caue I'm sure you now the center ports on the FH Fords V8 are common_ and assumed it had to do with that.

But, WTF do I know, just asked a question and give you my limited knowledge as a response.
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Old 04-28-2007, 10:46 PM   #17
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Default Re: GMC inline 6 where to start for killer motor

Sorry, it was listed as an "Ardun '33 Roadster"., I'll see if i can find the closed auction so you kow what I'm talknig about.
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Old 04-28-2007, 10:49 PM   #18
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Default Re: GMC inline 6 where to start for killer motor

Looks like it was relisted...saved me smoe searching...but read the description in the ad, hence my question.

http://cgi.ebay.com/ebaymotors/1933-...QQcmdZViewItem
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Old 04-28-2007, 10:51 PM   #19
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Default Re: GMC inline 6 where to start for killer motor

Here's a link to the car, just check the decription, which led me to believe it was for a FH V8

Cheers!

http://cgi.ebay.com/ebaymotors/1933-...QQcmdZViewItem
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Old 04-28-2007, 10:52 PM   #20
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Default Re: GMC inline 6 where to start for killer motor

Lol...and clicking on the links truely shows the "12 port" engine to be an inline six.

Damn, I just love talking to myself.
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