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Old 08-27-2009, 12:50 AM
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Oh crap!! 350 or 327??

So i have this 3970010 350 block with 2 bolt mains. I have been trying to find out what brand all the parts are because i got it had no receipts or any notes of what part were in it. My dad said it was build for a drag car, but only ever saw a few passes.

so it IS a 350 block, bot the pistons and forged speed-pro dome top with .030:7000p stamped on them. Through research, i have discovered that the pistons are for a 327.

How annoying.

would it be possible that someone a) used a 327 crank and pistons in a 350 block, or b) used 327 pistons with a 350 crank???

Please help me out. I will be so bummed if i have a 327, all this time I've thought i had a 350.



These picture were from a few months ago, and the whole thing is assembled in my car. I never thought to check the stroke when "350" is what the block say.

Thanks, Josh.

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Old 08-27-2009, 01:02 AM
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The "3970010" block was also used to make the "68-69 large journal 327 from the factory, it isn't "just" a 350 block. Without crank casting #'s or a stroke length check there is no way to know what combination of parts you have. The only clue you have is the piston part #, and allowing for the fact that there probably isn't some wierd odd length rod used, a 350 crank with 5.7" rods would push these pistons out of the top of the block by 1/8", crashing it into the head. That hasn't happened, so looks like you have a 327.
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Old 08-27-2009, 01:07 AM
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The block has the casting code "350" right next to "3970010".

could you put all 327 stuff in a 350 block??
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Old 08-27-2009, 01:10 AM
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The 010 block was used by GM to build 327's as well as 350's .

The block is the same. The crank stroke and piston pin height is the difference between a 327 and 350.

Can't tell you about the pistons except they are for a 327. The part number is the old catalog part number. Need a old TRW speed pro catalog or a cross reference.

Looks like a .250"+ dome at lest so the 327's cr is quite high with a 64cc head.
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Old 08-27-2009, 01:16 AM
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so what is the torque and hp difference from a 350 down to a 327?? I have read some forums saying that a 327 with rev better because of a shorter stroke, but a 350 will have a higher torque because of the longer stroke.

phooey.
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Old 08-27-2009, 01:23 AM
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That "350" cast next to the block # does not mean it IS a 350, just that it could be. Your pistons tell the tale. Large journal 327 crank and 327 spec pistons are a drop-in fit in any 2-piece rear main seal 4" bore block. Lots of poeple do this to make a 4-bolt main 327 using a 4-bolt 350 block. Being yours is 2-bolt main I would suspect it has been a 327 since it was new. The stamped coding on the flat pad at the front edge of the drivers side deck surface adjacent to the water pump mount will give you the original application if it wasn't machined off by a block decking during the rebuild.
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Old 08-27-2009, 01:29 AM
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well darn. So all of the threads i have stared are all lies. what are the major differences between a 327 and a 350 using all of the same parts and specs???

i.e. cam, cr, gears, intake, etc???
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Old 08-27-2009, 01:39 AM
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Using the same pieces it will just make a little less HP and torque. At a 1 hp/cubic inch level your looking at roughly 25 hp and 35 ft.lbs of torque. Probably a good thing with your T-5 trans

Don't worry about it that much, it isn't that big a deal when it isn't a race motor.
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Old 08-27-2009, 01:45 AM
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Quote:
Originally Posted by ericnova72
Using the same pieces it will just make a little less HP and torque. At a 1 hp/cubic inch level your looking at roughly 25 hp and 35 ft.lbs of torque. Probably a good thing with your T-5 trans

Don't worry about it that much, it isn't that big a deal when it isn't a race motor.

well... it is a race motor. 12:1 cr
292/300 cam, 256/264 2 .050 .545/.563 lift. 2.02/1.60 stainless valves...

so really i am still putting well over 100 lb/ft then what it is rated at.

Is it really true about how it rev's?? i was wondering because it will out rev my bros 305 tpi, and our 1991 5.0 HO mustang without even trying.
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Old 08-27-2009, 02:04 AM
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Ok, the 327 and it's "hi revving' mystique all comes from the 1960's, when it was the biggest SBC and would out rev the competition from other brands, and was entirely due to having superior cylinder heads in that time frame. It made for a reputation that still hasn't died, but it should have. All things said, with good heads a 327 won't outrev a 350, 383, or 406 with good heads, and a 327 with poor heads is a dog like anything with poor heads.

With decent heads, like you have, it will however outrev the TPI 305(poor heads and intake) and 5.0 Ford(poor heads and intake). If you went by the Forum pundits, short stroke= higher revs= more power, then the 5.0 ford should win, it has only a 3" stroke. It just doesn't work that way. Put the so called high revving 327 in Uncle Elmers farm truck and see how fast(or slow LOL) you are. It pretty much comes down to vehicle weight and cylinder head air flow.
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Old 08-27-2009, 02:10 AM
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A bit less hp a bit less torque, but peak hp and peak torque will occur at a little higher rpm point. So you want to gear it a little higher and rev it a bit higher on the shift and thru the traps.

It will still go like a bat out of hell in the same weight car.
We're taking 1 to 2MPH at best and a 10th or 2/10th difference ET (often less)
all said and done.

Don;t loose sleep over it. gear the hell out of it fill up the tank with 110 and go have fun.
This one is going to want to rev.

The ultimate rev limit of the SBC is limited by the valve train not the stroke or.... A bud used to run a very strong 8000rpm 406 SBC with a stock GM cast 400 crank.
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Old 08-27-2009, 03:01 AM
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Quote:
Originally Posted by Biscuit6447
Is it really true about how it rev's??
You really need to get over this "revving" business. Any motor you bolt in the car is just an air pump. X cubic inches will draw in X amount of air at X rpm's, that's all there is to it. I like to use math to illustrate a point, so here goes....
A 265 SBC will churn 690 cubic feet per minute at 9000 rpm's.
A 283 SBC will churn 690 cubic feet per minute at 8430 rpm's.
A 307 SBC will churn 690 cubic feet per minute at 7770 rpm's.
A 327 SBC will churn 690 cubic feet per minute at 7300 rpm's.
A 350 SBC will churn 690 cubic feet per minute at 6820 rpm's.
A 383 SBC will churn 690 cubic feet per minute at 6230 rpm's.
A 400 SBC will churn 690 cubic feet per minute at 5970 rpm's.
A 434 SBC will churn 690 cubic feet per minute at 5500 rpm's.

Theoretically, all these motors would make the same horsepower because they are all moving the same amount of air. So, don't get hung up on "buzzin' a smaller motor" and thinking you're gonna make more power. It'll simply take more money to do it and you'll make the same power. The smaller motor may have a slight theoretical advantage involving the reciprocating weight of the components, but it still has the task of moving the same weight as the larger motor, the car. The motor is not in a free-rev competition, it's tied to the drivetrain and has to move the same weight.

Any camshaft you screw into the motor will have a realistic range of operation of about 3500 rpm's, so the little 265 above would have to have a cam that made power from 5500 to 9000 and would be a nightmare to try to operate on the street. On the other hand, the 434 could use a cam that makes power from 2000 to 5500 and makes the same power as the 265, albeit in a more street-friendly rev range.

That's why the regular posters on this board will try to dissuade a newbie from starting with a smaller displacement motor when he's after horsepower. You can make the same horsepower, cheaper, with a bigger motor.

Maybe this will help to dispel the notion of some that you can make a more powerful motor by taking the 3.48" stroke crank out of the block and installing a 3.25" crank to make a "revver" out of it.

Last edited by techinspector1; 08-27-2009 at 03:09 AM.
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Old 08-27-2009, 03:52 AM
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sorry about that little thing about the revs. I completely understand the ability to get the same power easily out of a larger engine. my dad is kinda stuck back in the day and thinks that a 327 is just all that. I would take a 350 over a 327, but i was just curious about it because of the other forums i have read.

I didn't want to sound like that, and i am surprised at how much i got ragged for it. What i meant by the whole "how fast it would rev" was based on the same bore and different strokes. "there is no replacement for displacement"

so i really don't need any math lesson on flow rates at rpm based on cid. I didn't mean to sound so stupid about a motor that will 'rev' quicker just because it got the reputation 30 years ago.

What I WAS trying to say is it seams it had really really good throttle response compared to two factory engines, not how well it will perform because it can turn faster. This is my first time with non-factory type stuff.

because i can't type all what i really want to say, i hope this thread will end without me looking an idiot that can't use common sense. I was just kinda mad that i have 23.47025 less cubic inches than i thought. poop

I guess ill hafta live with that.
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Old 08-27-2009, 04:35 AM
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The combo will dictate the throttle response. Cam, intake, carb, gears, compression, it all works together. Your not loosing much by using a 327, and I sure wouldn`t loose any sleep over it. Like Bird said, I would slap some 110 in the tank and enjoy the he** out of it.
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Old 08-27-2009, 09:18 AM
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Biscuit6447, Don't cry over spilled milk. 327 is a very good motor. They will make power, and I have seen guys running 327 at the track doing 11, 12 second passes. All you need is a good set of rear end gears. The old corvette 327 used 2 bolt main, and they were screamers. Remember the grump.
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