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Thread: 327 v-8 horsepower??

  1. #1
    Registered User weirdal239's Avatar
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    327 v-8 horsepower??

    can anyone tell me how much horsepower a bone stock 327 carborated engine has?
    can anyone tell me where i can get one at?
    someone told me that you can't get them anymore.
    if that's true can i build one form a 305?:confused:

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    Registered User Catching Second's Avatar
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    I don't know much about bone stock 327's... but I'llt ell you what I do know about them. My dad was running a Chevy Vega drag car that weighed around 2-2500lbs with a 327 in it. It had 12:1 compression, Dart II heads, Edelbrock tunnel ram, 2 Holley carbs, etc. He was cutting 11.30's all day.
    "A true hotrodder wouldn't be content untill he had created a car so violent, so hairy, so totally sick that the very act of dropping the hammer would result in instant death. Anything less results in the need to go faster." - Tony DeFeo

  3. #3
    Senior Member bigjsp's Avatar
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    327 are one of the more confusing engines particulaly when you start swapping parts because they came in 2 different journal sizes.


    There was a factory "offroad only" 327 hich made 365 horse power @ a 7000 + RPM..... no you won't just find one of those laying around, well if it has 2 metal head gaskets per side.............


    To stereo type what you should do to maximize this motor -------- keep your truck light and put a big cam and 6 speed and some 4.56 gears.

    It will be a real he man women haters vehicle and you better plan on some sticky tires and good traction aides to hook up but the 6 speed overdrive high gear will save you RPM wise when cruising.

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    Registered User Bryce's Avatar
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    You can build a 327 with a 350 block all you need is the crank and rods and 327 pistons because of the different pin placement for the rods

    since you dont have any of this I would buy a aftermarket crank from scat or eagle or buy the whole bottom end kit since you will need it all anyways

    with a 327 I would go with either a solid cam or a hyd roller since the main thing your going to get with a 327 is rpm you are going to loose torque vs a 350 because you are decreasing stroke



    Keep in mind though for the cost of doing that you could build a 383 and have gobs of torque and have a motor that makes all its power at a lower rpm which is always better for a street motor (Best option Imo)

    and you will make more power
    the real KEY TO MAKING POWER is all in the heads and cam if you build a stock bottom end 355 and stick on a good set of aftermarket heads or vortecs for that matter and you will have more power then you need on the street
    thats why the 327 and the chevy 302 are such fabled motors because they came with the best factory heads (at the time) and solid cams so they could rev high (you dont want your valve train to limit what your bottom end can take)

    The best idea is to build a 383 but if you short on cash a 350 is still going to make it move fast but a 383 is going to get er going even faster. Always spend your cash on good heads as they and your cam will determine your performance more then anything else on your motor
    Just rev it till it goes bang..... then you know what your engine can or cant do.

  5. #5
    Registered User Myself's Avatar
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    Most stock 327s were 250 hp. The ones with the factory high rise intake and holley or carter carbs were 300 hp. The 327 truck engines had mostly forged steel cranks. The early 327s were small journal and the later ones were large journal like a 350. You can use a 350 block and a 307 crank and make a large journal 327. They rev up very quick and sustain higher rpm than a 350 or 383 so, if you put it in something lightweight then torque is not a concern and you will go FAST! Not quite the same as building a 350. Cam selection, intake, timing, etc. a little more critical, they don't respond as well to huge cam profiles.

  6. #6
    built not bought pimpinblazer89's Avatar
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    my buddy have a 327 from a 67 corvette that we are thinkin of putting in his 94 2dr 2wd blazer , on the valve covers its got a sticker thart says "250 hp" doesnt look like we are gonna be able to bolt up the brackets that were on his 4.3 vortec, for the power sterring pump , ac , alternater etc
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    Registered User ZZ4Blazer's Avatar
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    The heads might not be drilled for the standard accessories.

    IMO, on the street, cubes are king!
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  8. #8
    Senior Member bigjsp's Avatar
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    don't forget the nitrous

  9. #9
    Blazin no mo Forklift's Avatar
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    Originally posted by bigjsp
    There was a factory "offroad only" 327 hich made 365 horse power @ a 7000 + RPM..... no you won't just find one of those laying around, well if it has 2 metal head gaskets per side..............
    what did those come in Big?
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  10. #10
    Senior Member bigjsp's Avatar
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    My dad was racing sportman class stock cars in the early 60's and the late model driver that they helped after they were done had a local GM dealership backing. Looking back they believe that he got some advanced motor that was a prototype for the 64 under an offroad only part #.

    I did a little more research and "officially" the 365 HP motors were L79 option in the 64 and 65 corvettes, the fuel injected motors made even more power.

    there are alot of other 327 motors listed too

    http://www.musclecarengines.com/Corvette_History.htm

  11. #11
    Fully Erect Member LowKat's Avatar
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    Some 327 info off the top of my head.

    Available HP ratings

    250HP - 4BBL WCFB carb - cast iron intake - 1.74 intake valve - 2" exhaust manifold outlet (1962 and later)

    275HP - 4BBL WCFB carb - cast iron intake - 1.74 intake valve - 2" exhaust manifold outlet (1962 and later)

    The engines above have the 'Power Pack' head with a single hump or 'tower' marking cast on the end of the head. All are cast iron crank and hydraulic cam. 5500 RPM factory redline

    The engines below have the 'Fueler' or double hump or double tower marking on the head. Starting sometime on/off in late 1968 the heads have provisions for bolt-on accessories. On and off in late 68 and all 1969 is when the crank size went to large journal. Most 300HP are a cast crank but steel ones can be found. (If engine came out of a PU with a T-400 auto trans it will have a steel crank but still has cast pistons)

    300HP - 4BBL Holley or AFB carb - cast iron intake - 1.94 intake valve - (L-75 option) (1962-up) 2-1/2" exhaust manifold outlet cast pistons, hydraulic lifter cam, 5500 RPM factory redline

    All of the engines below have 2-1/2" exhaust manifold outlet, steel crank, forged pistons, solid lifters

    340HP - 4BBL AFB carb - aluminium ($$$) intake - 1.94 intake (L-76 option) (461 or rare 461X heads) (1962-1964)

    350HP - 4BBL Holley DP carb - aluminium intake - 1.94 intake (L-79 option) (1965-1969) (some of these engines made in mid to late 69 can have 302 Z-28 head castings w/2.02 valve)

    360HP - Fuel injection - 1.94 intake (461 or rare 461X heads) L-76 option (1962-1963)

    365HP - 4BBL Holley DP carb - aluminium intake - 1.94 intake (L-76 option) (1964-1965)

    375HP - Fuel injection - 1.94 intake (L-84 option) (1965)

    Starting in 1970 all 327 performance engines were replaced with the LT1-350/360HP so only the 300HP and lower survived

    (the 1964-1967 Nova block has a recessed oil filter boss and is valuable to restorers especially the HP 362 casting #)


    OK that's it.... almost ...

    Checker Motors (taxi's) and especially MercCruiser (boats) are a good source for steel crank 300HP/327's
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  12. #12
    Your mom's box! slammins15's Avatar
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    Also since 1999 GM has been using the 327 (5.3) with vortec heads in the fullsize trucks might wanna check into one of those.
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  13. #13
    Let's Go Pens! S/T Lover's Avatar
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    Originally posted by slammins15
    Also since 1999 GM has been using the 327 (5.3) with vortec heads in the fullsize trucks might wanna check into one of those.

    Not to be a nit-picker, but they aren't 327's.. They're 325's
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  14. #14
    Your mom's box! slammins15's Avatar
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    Originally posted by S/T Lover
    Not to be a nit-picker, but they aren't 327's.. They're 325's
    Hate to burst your bubble but a 5.3 is 326.725 cubic inches,and is considered a 327 engine. At least the last 5 we sold said on the list sheet 327/5.3 and my dads last 2 said 327/5.3
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  15. #15
    Camel Toe Inspector junky2's Avatar
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    My 05 Silverado has the 5300 v8 in it and according to
    my friend at the dealership GM considers it to be a 327.

    4300 = V6
    4800 = V8 (307) 285 HP @ 5200 RPM
    5300 = V8 (327) 295 HP @ 5200 RPM
    5300 H.O. = (350) 310 HP @ 5200 RPM
    6000 = V8 300 HP @ 4400 RPM
    6000 H.O. = V8 345 HP @ 5200 RPM
    8100 = V8 Big Block 330 HP @ 4200 RPM
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