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Old 08-03-2011, 02:29 PM
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327. horsepower estimate?????

i was hoping someone with a little more exp. than me could tell me where about my horsepower level is. i have a 327 lg journal.
aluminum vette heads, 1.94 int 1.60 exh. screw in rocker studs, hardend guide plates with springs matched to my cam. 10.75 to 1 compression.
isky cam flat tappet, .485 lift 280 duration.
isky super hydraulic lifters.
edelbrock rpm air gap intake.
holley 670 cfm double pumper carb.
1" carb spacer.
summit billet alum. hei 1 wire dist. w/65,000 volt coil and adjustable vac.
dual ide noisey timing gears.
full length hedman headers "g body".
comp cams hardend pushrods.
3,000 rpm stall converter.
and plan on runnin 4.56 gears out back,

any info someone could give me would be a HUGE help im completely in the dark here. i was hopin for around 350hp but have no way to put a finger on it.

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Old 08-03-2011, 02:33 PM
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alsowhat is a safe rpm to wind a 327 out to?

iv only heard stories about them but have never owned a 327. i assume they could rev a little higher than a 350 since the rotating assembly is a little lighter. but its a stock bottom end and dont wanna push my luck. what can u safely wind a 327 out to?
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Old 08-03-2011, 03:37 PM
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The octane of the fuel and timing curve is going to come into play as much as 1 hp per cu in (327hp) up to 350 hp. Hard to guess. From your cam sprcs I would guess 6,000-6,500 right?
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Old 08-04-2011, 02:56 PM
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My guess is around 370HP. Chevy did build a 327/350hp engine and it was using 447 lift cam. You got a more cam lift and timing.
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Old 08-04-2011, 03:41 PM
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Quote:
Originally Posted by lg1969
My guess is around 370HP. Chevy did build a 327/350hp engine and it was using 447 lift cam. You got a more cam lift and timing.
SO I GUESS IM PRETTY CLOSE TO MY MARK. I THINK AROUND 370 OR SO HP. IS A PRETTY STOUT WEEKEND TOY. IF IT WERE AROUND 370HP WOULD A SET OF 4.56 REAR GEARS OUT BACK GET A G BODY MOVIN PRETTY GOOD?
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Old 08-04-2011, 04:28 PM
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Not so fast, I think 4:11 gears be better off.
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Old 08-04-2011, 07:51 PM
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I would say the 327 has a heavier rotating assembly than a 350 due to the extra tall pistons (1/4 inch taller). What helps the 327 rev is a better rod/stroke ratio which lowers the piston speed as compared to 350. But this is not an issue until after 7000 or 7500 rpms.

The heads have a huge effect on hp. If you are using L98 heads then that is a horse power killer, as these heads don't flow well. Maybe 200cfm on the intake @ 0.500" lift. And maybe 180 cfm at 0.485" which would limit your engines max hp to 360hp. (2 x max cfm).

If you are making 350hp with those heads it would be a good result. You could get close to 400hp with your combo with a better set of heads.
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Old 08-04-2011, 09:10 PM
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rear gear

Go with the 411 rear gear because with the 456 yeah it will have a hell of a launch maybe for the 1/8 mile,but if you plan on running the 1/4 mile you will already be maxed out on your speed at half track.With the 411 you will still have good launch and still a top end capability.What I am saying is the 327 will wind up real quick but the 456 gear will just hold you back getting your top speed to quick and being run down at the lights.
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Old 08-05-2011, 08:33 AM
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Quote:
Originally Posted by 454C10
I would say the 327 has a heavier rotating assembly than a 350 due to the extra tall pistons (1/4 inch taller). What helps the 327 rev is a better rod/stroke ratio which lowers the piston speed as compared to 350. But this is not an issue until after 7000 or 7500 rpms.

The heads have a huge effect on hp. If you are using L98 heads then that is a horse power killer, as these heads don't flow well. Maybe 200cfm on the intake @ 0.500" lift. And maybe 180 cfm at 0.485" which would limit your engines max hp to 360hp. (2 x max cfm).

If you are making 350hp with those heads it would be a good result. You could get close to 400hp with your combo with a better set of heads.
I don't think so. I believe the piston on the 327 and 350 are the same size. The differance is the location of the wrist pin on the piston. It's change by 1/4".
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Old 08-05-2011, 08:39 AM
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The pin is moved down so there is more piston above the pin to make up to the deck, and the skirt is the same length so this makes the piston longer.

The last time I compared a 327 piston to a 350 piston the difference was huge. Just like a 383 piston is typically shorter than a 350 piston.
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Old 08-05-2011, 10:06 AM
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Quote:
Originally Posted by CHEVYRODS
Go with the 411 rear gear because with the 456 yeah it will have a hell of a launch maybe for the 1/8 mile,but if you plan on running the 1/4 mile you will already be maxed out on your speed at half track.With the 411 you will still have good launch and still a top end capability.What I am saying is the 327 will wind up real quick but the 456 gear will just hold you back getting your top speed to quick and being run down at the lights.
iv never used or even experienced a set of 4.56s. the tallest ive ever gone was 4.11. i just cant seem to wrap my head around what the reaction would be. i dont plan on taking any long trips but would like it to climb for 1/4 mile. would 4.56 really b wound out completely by the 1/4 mile? and would 4.11s with myset up be a "decent" ride? i dont wanna get out there and run a 14 lol
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Old 08-05-2011, 10:16 AM
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Quote:
Originally Posted by CHEVYRODS
Go with the 411 rear gear because with the 456 yeah it will have a hell of a launch maybe for the 1/8 mile,but if you plan on running the 1/4 mile you will already be maxed out on your speed at half track.With the 411 you will still have good launch and still a top end capability.What I am saying is the 327 will wind up real quick but the 456 gear will just hold you back getting your top speed to quick and being run down at the lights.
i was just looking at the ring and pinion gear calculator on summit and it shows only a 10 m.p.h diff between the 4.11 and 4.56 gear. 4.56 at 6k with 24 in tires is 94 m.p.h. 4.11 at 6k with 24 in tires it 104.it seems as if both of them would be in the same ball park both maybe a lil to tallfor 1/4 mile runs???????????if my car still climbs at 1/4 mile im golden i dont care to take any road trips its only a toyfor me. but im wonderin if goin through the traps at 100mph at 6,500 rpm might be pushin my motor a lil to hard.?
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Old 08-05-2011, 10:57 AM
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Gears

The 456 gear is basically a strip gear only,not to good for street use. The 411 is strip ready and street friendly with the right tranny. Until you have driven a car with 456 rear gears you will never see how much of a difference it makes.As far as the book goes,you can set up 2 cars identical to each other and they will not run exact times or perform equally. If you are planning to drive the car much on the street go with the 411.
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Old 08-05-2011, 11:51 AM
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Quote:
Originally Posted by CHEVYRODS
The 456 gear is basically a strip gear only,not to good for street use. The 411 is strip ready and street friendly with the right tranny. Until you have driven a car with 456 rear gears you will never see how much of a difference it makes.As far as the book goes,you can set up 2 cars identical to each other and they will not run exact times or perform equally. If you are planning to drive the car much on the street go with the 411.
would 4.11 get her movin ok? im dealin with a pretty heavy car. an 81 monte carlo all steel. i belive 3500 or so with a 250lb driver?
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Old 08-05-2011, 12:38 PM
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More like 3600. Get a 383 or 400sbc if you want low end grunt. The amount of cash for a 327 to get horsepower is a lot. Like the old saying "No replacement for displacement"
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