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Old 09-13-2011, 07:00 AM   #1
83highsierra
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327 vs 350

ok wich motor should i go with i was wanting to do a 355 but i have a chance to get a 327 with aluminum intake rv cam hei and short water pump. as far as fuel mileage? which will be better also can i put vortec heads on the 327 i can get a set pretty cheap? will everthing i have right now with my 305 bolt up? and what kind of power would i be looking at fort the 327?
also will i see a difference from my 305 with aluminum intake and headers? if i go with 327

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Old 09-13-2011, 07:24 AM   #2
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Re: 327 vs 350

There is a lot more to the question than the number. The 302, 327 and 350 all have 4" bores. The stroke length is what changes the displacement. Generally, shorter stroke will will be quicker. Longer will have more horsepower. Although either can be good, 350 is probably better for our trucks and is more common. If I was building a light car for the drag strip the 327 or 302 might get preference.

Spend your money (and you can spend a lot) on heads, carb, intake, exhaust. That is where the magic happens. With the right stuff bolted on, either of the motors can make gobs of power. By the way, I choose option "C". I am keeping the 305. It is limited but more than enough for my needs. Most of the bolt-ons will move from the 305 to the other motors.
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Old 09-13-2011, 11:16 AM   #3
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Re: 327 vs 350

Is the 327 out of a passenger car or out of a truck? That will make a big difference in terms of power. See if it has a "High Perf" stamp on it. If it does, I'd go with that over a truck 350. That only applies if the 350 isn't stamped "High Perf," then I'd go with that one. In an old truck, cubes are your friend. To get one of these old bricks moving, you need low end (which you won't find much of in a 302, but the 350 should be plenty). Go as big as you can IMO, providing they're all equally built.
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Old 09-13-2011, 04:50 PM   #4
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Re: 327 vs 350

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Originally Posted by sumran View Post
Generally, shorter stroke will will be quicker. Longer will have more horsepower. Although either can be good, 350 is probably better for our trucks and is more common. If I was building a light car for the drag strip the 327 or 302 might get preference.

.
What do you mean the shorter Stroke will be quicker?

Look at it this way, if you get 1 hp per CI (which is pretty easy) you're ahead by 22 HP and FT-LBS just by doing the 355...
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Old 09-13-2011, 05:16 PM   #5
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Re: 327 vs 350

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Originally Posted by Your41Plague12 View Post
Is the 327 out of a passenger car or out of a truck? That will make a big difference in terms of power. See if it has a "High Perf" stamp on it. If it does, I'd go with that over a truck 350. That only applies if the 350 isn't stamped "High Perf," then I'd go with that one. In an old truck, cubes are your friend. To get one of these old bricks moving, you need low end (which you won't find much of in a 302, but the 350 should be plenty). Go as big as you can IMO, providing they're all equally built.
High Perf is only on big blocks, not small blocks. The only difference in passenger car and truck engines is usually compression (even then it the bigger trucks that have low compression). Cams in a truck engine will be more whimpy than a passenger car. Strenght wise for the most part a passenger car or truck engine is just fine.
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Old 09-13-2011, 06:38 PM   #6
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Re: 327 vs 350

The shorter the stroke, the faster it revs up!
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Old 09-13-2011, 07:08 PM   #7
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Re: 327 vs 350

...its all about the cubes.
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Old 09-13-2011, 07:13 PM   #8
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Re: 327 vs 350

If you are asking about a late model 5.3(327) I would go that route
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Old 09-13-2011, 07:22 PM   #9
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Re: 327 vs 350

Go big.
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Old 09-13-2011, 07:22 PM   #10
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Re: 327 vs 350

Bottom line, ALL else being equal, more cubes ALWAYS=more power
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Old 09-13-2011, 07:25 PM   #11
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Re: 327 vs 350

There's no substitute for cubic money.
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Old 09-13-2011, 07:35 PM   #12
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Re: 327 vs 350

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There's no substitute for cubic money.
Exactly, You Can Make a MOPED go fast with enough money
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Old 09-13-2011, 08:20 PM   #13
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Re: 327 vs 350

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Originally Posted by gchemist View Post
The shorter the stroke, the faster it revs up!
Not true!
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Old 09-13-2011, 08:43 PM   #14
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Re: 327 vs 350

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Originally Posted by jrcaprai View Post
What do you mean the shorter Stroke will be quicker?

Look at it this way, if you get 1 hp per CI (which is pretty easy) you're ahead by 22 HP and FT-LBS just by doing the 355...
A poor word choice. I would expect the shorter stroke to push peak hp and torque higher in the RPM range. For a a light car designed for quick short runs (1/8 or 1/4 mile) the 302 with the right gearing (like a '69 Z28) can be a lot of fun. A 350 can go faster and a 350 is a better choice for our trucks.

My main point was that what you do to the motor is a lot more important than the 327/350 starting point.
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Old 09-14-2011, 12:11 AM   #15
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Re: 327 vs 350

327 will rev higher but not faster. Bottom line is TORQUE. Torque moves weight. Trucks are heavy. With a longer stroke, the 350 is going to be a better choice. Heads are interchangable on both.
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Old 09-14-2011, 09:05 AM   #16
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Re: 327 vs 350

I built a 327 and a 350 for my 68 Cmamro and ran the same time in the quarter mile. I think a 327 is a stronger engine. Better quality but the 350 will have more bottom end torque for a truck.
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Old 09-14-2011, 12:11 PM   #17
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Re: 327 vs 350

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I built a 327 and a 350 for my 68 Cmamro and ran the same time in the quarter mile. I think a 327 is a stronger engine. Better quality but the 350 will have more bottom end torque for a truck.
Did both engines have the same parts, specs and build quality? if not the point can quickly become mute.

It would be simple to build a stout 327 screamer, to walk all over a mild 350. Even in a heavier truck. I could build one on dyno sim and without to much trouble get upwards of 450 hp and make more peak torque than the mild 350.(the trade-off is that you will have to spin the smaller motor at a higher rpm) But this is not even a apples to apples comparison...it is not a secret at all that smaller cube motors can go faster than bigger cube motors ....its all in the parts combo, build quality and money.

But all of this confuses the point that if two similar engines of different displacement spec out the same, or close to ...the larger motor will make more torque and horsepower, and with enough traction will push a quicker et....you simply can't get away from the cube advantage when all else is equal. It's just physics.
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Old 09-14-2011, 12:22 PM   #18
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Re: 327 vs 350

i could see this discussion go on and on and on and on....
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Old 09-14-2011, 12:43 PM   #19
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Re: 327 vs 350

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I built a 327 and a 350 for my 68 Cmamro and ran the same time in the quarter mile.
Then something was wrong or different with the 350.... or the 350 had more torque and spun the tires more?

Apples to apples Comparison: if you achieve 1.3 HP per Cubic inch on both engines... this is why bigger is better

327 x 1.3 = 425.1 HP
350 x 1.3 = 455 HP

the 327 will not rev higher than the 350 if they are built the same.
the 327's torque peak will be a few hundred RPM's Higher, but will not Rev Higher
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Old 09-15-2011, 12:06 AM   #20
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Re: 327 vs 350

i could see this discussion go on and on and on and on.... LOL. I really don't think you'd notice much difference between the two. A 400 on the other hand you would notice the difference in cubic inches. This aint my first rodeo.
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Old 09-15-2011, 01:54 AM   #21
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Re: 327 vs 350

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i could see this discussion go on and on and on and on.... LOL. I really don't think you'd notice much difference between the two.
and on and on ....."about 25 more horsepower"......and on and on........
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Old 09-15-2011, 02:38 AM   #22
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Re: 327 vs 350

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327 will rev higher but not faster. Bottom line is TORQUE.
AND ON.....AND ON....:
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Old 09-15-2011, 10:03 PM   #23
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Re: 327 vs 350

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Originally Posted by sumran View Post
There is a lot more to the question than the number. The 302, 327 and 350 all have 4" bores. The stroke length is what changes the displacement. Generally, shorter stroke will will be quicker. Longer will have more horsepower. Although either can be good, 350 is probably better for our trucks and is more common. If I was building a light car for the drag strip the 327 or 302 might get preference.

Spend your money (and you can spend a lot) on heads, carb, intake, exhaust. That is where the magic happens. With the right stuff bolted on, either of the motors can make gobs of power. By the way, I choose option "C". I am keeping the 305. It is limited but more than enough for my needs. Most of the bolt-ons will move from the 305 to the other motors.
Wow okay. Wrong. Shorter stroke= faster reving higher reving and more hp. Longer stroke = more torq slower rev. And cannot rev as high. Ford came out with the302. When chevy losts sales they made the 327 as a filler motor it was made fast under thought out and sloppy. Then ford made the 351 and chevy responded with the improved 327 and called it a 327ho. High output. It was a flop. Chevy finally then made the 350 and did it right besides the heads. The heads r the same as a 327but have smaller valves. This is why people use a 350 with 327 heads. Get a 350 man. Thy r everywhere and easy to find parta for.
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Old 09-15-2011, 10:09 PM   #24
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Re: 327 vs 350

Theres a reason everyone puts a 350in man. Fords volkswagons everything. Chevy350is what started it all. Put a 350in. With 350th trabs and itll last anoter 30 years. I could b wrong with the ford data. Its been awhile lol.
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Old 09-15-2011, 10:24 PM   #25
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Re: 327 vs 350

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Wow okay. Wrong. Shorter stroke= faster reving higher reving and more hp. Longer stroke = more torq slower rev. And cannot rev as high. Ford came out with the302. When chevy losts sales they made the 327 as a filler motor it was made fast under thought out and sloppy. Then ford made the 351 and chevy responded with the improved 327 and called it a 327ho. High output. It was a flop. Chevy finally then made the 350 and did it right besides the heads. The heads r the same as a 327but have smaller valves. This is why people use a 350 with 327 heads. Get a 350 man. Thy r everywhere and easy to find parta for.
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Seriously? Spread some more Horse Shiite why don't ya
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