327 vs. 350

Discussion in 'Engine Topic' started by Ruthead, Aug 21, 2021.

  1. xten

    xten Veteran Member

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    ^^^ This. Love me a 383 and I'm sure Biker does too.
    Kid's FIL had a 67 Camaro almost 40 years ago with a 331 (327 +30). Ran 10.20's all day long. Tunnel ram, 2 4's. 15:1. Shifter at over 10K. Not streetable in the least. Go with cubes.
    I googled his FIL to see if there was anything about his Camaro, but he has the same name as a famous Irish cricket player, and that's all that came up. lol
     
  2. biker

    biker Veteran Member

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    Yessir. Love my 383. For the money I have in it, it runs like a champ. Even with what some might consider a cam on the less streetable side, the extra cubes make good idle vacuum, starting and cruise manners even lugging it when needed.
     
  3. badazz81z28

    badazz81z28 Veteran Member

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    What are you trying to say? Lets get real here...an engine's performance is all about efficiently getting air and fuel in and exhaust out...it doesn't matter the make, model, year, cylinders etc...built right and a small engine can easily out perform a bigger one. Just like an LS3 can romp a BBC. Rice burner engines can make big power too, but need RPM and most times a power adder to make big power. Its all in how its built bud...
     
  4. 1320feet

    1320feet Veteran Member

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    327 vs 350. I'd go for the 350.
     
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  5. G72Zed

    G72Zed Veteran Member

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    @ Ruthead, again, very good insight and feedback from the Nasty members as usual, and I agree with them on this "327 vs 350" question you have posed. And this is coming from a 327 proponent since the early 80's, I built my first 327 in the late 80's and still used that very basic engine & combo until the 2020 season.

    Can the 327 make good HP per cube, yes it can, and often it will out "hp per cube" the larger stroke engines of the same spec & architecture in most cases, but, it's averages (tq) that really get's things moving, and installing a short stroke in a heavy street car with a basic automatic and mild gearing makes for a mushy performer for the most part.

    The higher rpm peaks that the 327 tends to favor naturally, and is taken into account to get the package even more power comes at a cost in many ways. Unless you got good quality parts, including the complete valve train, a numerically high rear gears, a 5 or 6 speed in a medium weight car, the cranks stroke is your friend, make it work for you.

    Here is a dyno test comparison of my 327 in RED (actually 333.3) and my 350 in GREEN (actually 362.5) SBC.

    This was in May 2020. Many of the same components where used, block, oil & oil pan, dyno/headers-exhaust-fuel- carb/spacers, same style of intake, ignition and CR of approx. 10.5, SFT cams with 520 lift. Both heads flowed almost the same, but the 327 was aluminum and the 350 is Iron, close to the same runner volume as well (205/210cc).

    My old Iron Sportsman II headed 327 made 541 HP, so that wins the HP/cube contest and peak bragging argument, but grafting it on this sheet, and looking at the averages over the run, it would loose out to the 350's lower 533.8 hp peak.

    Anyway, that's my input on the 327 vs 350 question.

    327 vs 350.jpg
     
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  6. Bandit723

    Bandit723 Veteran Member

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    And i wonder why the short stroke Nascar engine runs the way they do. They can burn the snot off the tires and yet run 9K all day long. I do have to say luv the torque of stroker or a big block but rather go with a destroked engine.
     
  7. Ruthead

    Ruthead Member

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    Wow lots a good thoughts here. it actually makes sense to just build the 350 in it. Was prolly more the novelty of a 327 makin me consider it. Don't need a spare engine sittin anyways.

    Where di I find what crate motor it is? I know had a guy look firewall side back and said its a GM crate but that's all he said and I was doing something else when he looked so didn't really see where.
     
  8. G72Zed

    G72Zed Veteran Member

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    Yep, nothing like RPM with reduced piston speed, side load, and 23 psi oil pressure for 500 miles at 8-9,300 rpm. Who cares about TQ at 3-4,000 rpm, you're never there anyway, it's a waste.

    And makes it easy for them to stay at the 358 ci limit by starting with the 4.155 bore with a 3.300 stroke, bore in .005 thou increments and take it down in the crank till you get to 4.185 and a 3.250 stroke.

    Look at some of the quicker cars out there, the trend is not going bigger strokes or cubes, it's actually going the other way.

    Now, imagine winning a CUP race, and then getting protested because the engine actually measured "under" the cubic inch limit size of 358, rules didn't say a minimum.
     
  9. G72Zed

    G72Zed Veteran Member

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    I don't.......a 1/8th ET in the 6.9 range equates to approx. an 11.0 @ 120mph in the full 1/4 mile.

    My 3,500# 1971 Camaro full street car ran dang close to that way back in the 90's with my all iron 327, 11.1 @ 119.5, it took 460hp at the wheels to get that time, without the "stroke in the bottle" happy gas, it was 12.70 @ 110, all through the crappy Flowmasters LOL. That was the best/funnest combo I ever had.
     
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  10. Harry coyne

    Harry coyne New Member

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    As a lot of people will say 350 all day long. I’ve had , 350, 400, and 327 in the same camaro a few years ago. I swapped the heads and cam, intake, dist and carb etc to each one. All had pretty good slug at say 10-1. The 327 actually went better because the cam that I had in them, went better at higher rpm approx 6000 rpm. So you just can’t automatically say more
    Displacement. Also I had a 350 trans with shift kit then a Muncie 21
    4 spd on all 3. It comes down to what you have and where you put the money. If you have a 4 spd 327 all day long, if auto, ya you probably need a 10 tourqe converter. Also, the 327 ate everyone up that stopped at a red light that included bbc.

    look up the cam, that will tell you what to run, and a 327 is very streetable and has good manners. I also never put race gas in her either
     

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