Beefing up the 327 - Team Camaro Tech
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post #1 of 20 (permalink) Old Oct 12th, 09, 07:25 PM Thread Starter
Evan B
 
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Beefing up the 327

Hello everyone, my name is Evan and I'm new to the forums. My father has a 1968 Camaro with a 327, it isnt an SS or RS. We gave it to my uncle for the last 9 years due to us moving overseas, but it is being shipped back to us from North Carolina.

The car is mechanically original, nothing has been done to the transmission or motor. I understand there are many different 327's, and I will not know which it is for sure until it gets here.

The first thing we are going to do is take the motor apart and start rebuilding it. While we have it apart, we are thinking we should do some stuff to produce a better sound and more power.

I'm just starting my research, but so far we are thinking:
-Different camshaft (Vodoo 60101 or 60102?)
-4bbl carb (reasonable price, decent performance)
-Different heads, if recommended to run a different camshaft (maybe vortec, or what do you suggest?)

I have no clue which heads are on it until the car arrives in a couple weeks, but I know everything on the motor is original. I would like to get around 350HP out of the motor, can some of you all help me out? Sorry for not having much info on the car, I haven't been able to look at it in years. I just want to know what I should start looking for and what will need to be replaced on the motor.

Thanks, Evan

1968 Camaro Convertible
327/210hp with PG tranny
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post #2 of 20 (permalink) Old Oct 12th, 09, 10:59 PM
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AJ
 
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Re: Beefing up the 327

My advice would be don't go too large with the upper end if you have high gears and a auto trans such as a glide.

Some good combinations would be 10.5:1-11:1 compression, comp 280H-286H magnum, decent dual plane intake (perf rpm), holley based carb no larger than 650cfm, there is a broad choice for cylinder heads depending on how much money you want to spend, I would suggest a good after market aluminum head no larger than 170cc runners 2.02/1.60 valves, full roller rockers, some kind of long tube headers, I would say get 1-3/4".

I'm confident the .040" 327 we built has 370-380hp at the crank, similar specs to above, decked block to .015", .025" composite head gasket, 10.8:1 comp cams 286H-10 magnum, not so great after market aluminum heads that are a tad too big (190cc runners) 58cc 2.02/1.60
Pulls really hard from 2,500rpm-7,000rpm

The cams you listed are decent for a lower compression ratio, it would be better to have the lift nearing .500" to take advantage of the better cylinder heads you are going to run. The 280H is 230* @.050 with .480" lift on a 110lsa, the 286H is a step above; 236 @ .050 .490" lift on a 110lsa, both of those will get you the "sound" you are looking for. I wouldn't recommend putting the 286 in anything lower than 10.8:1-11:1 compression, especially in a 327.

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'14 5.0 Mustang
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post #3 of 20 (permalink) Old Oct 12th, 09, 11:32 PM
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Re: Beefing up the 327

I wouldn't go any larger than 1-5/8" on the header primary size, and use a 2-1/2" collector.

"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968
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post #4 of 20 (permalink) Old Oct 13th, 09, 12:34 AM Thread Starter
Evan B
 
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Re: Beefing up the 327

Thanks for the help, I'm pretty sure it has a glide transmission. I'm afraid that once we get the motor running strong how we want it, the transmission might go out on me. Is it worth it to rebuild the one in it, or replace it with a 4 speed auto such as the t350?

As for the carb, would the Holley Street Avenger 570cfm be appropiate for this setup? I've seen a few guys on here running that one.

And John, say I wasn't to replace the cylinder heads at this time, would I be able to run the Vodoo cam shafts I stated earlier, or would I be at risk of burning the valves or messing something up? I would rather replace the heads, but I will have to see what my pockets will let buy.

Again, thanks for the help. I'm here for to learn and hear everyone's suggestions and opinions.

1968 Camaro Convertible
327/210hp with PG tranny
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post #5 of 20 (permalink) Old Oct 13th, 09, 08:09 AM
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Re: Beefing up the 327

Evan

If it's a 2 barrel, 210 horse 327 with a glide and 2:73 gears out back you'll be wanting to change a lot of things. If it's a 275 horse 327 you'll have a better starting point.

Wait and see what you have to work with before putting too much thought into it.

Mark

68 327 4-speed 3.42 posi and a sunroof
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best so far... 13.25 at 106mph

78 Firebird 350/T350 3.23 posi
65 Mustang convert. 6 cyl. 3-speed
66 Mustang coupe 6 cyl. auto
80 Chevy C10 406 4-speed

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post #6 of 20 (permalink) Old Oct 13th, 09, 01:14 PM
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Re: Beefing up the 327

If it turns out to be the 327/210, leave everything internal in the motor (they are already equipped with the 275hp cams which is around 260* advertised duration if I remember correct), get a dual plane intake, holley carb, msd ignition, and headers. Save up for heads and cam later on, you really need different heads on the 327/210 motors, otherwise your cam choice is severely limited.
The th-350/400's are 3-speed autos
The 200r-4/700r-4's are 4-speed autos, both with over drive

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'14 5.0 Mustang
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post #7 of 20 (permalink) Old Oct 13th, 09, 01:29 PM
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Re: Beefing up the 327

Welcome Evan- please post a photo or two when you are able. First mods I'd recommend are disc brakes, steering box and transmission. The powerglide suffers from having only 2 gears. More gears = more fun! good luck with it.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #8 of 20 (permalink) Old Oct 13th, 09, 05:47 PM
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Re: Beefing up the 327

Something else to consider, if you plan on running it hard, store the 327 and build a 350. This is what I did with mine. I figured I could build a 350, very easy to find, and if by some chance I blew it up I still would have the original engine.
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post #9 of 20 (permalink) Old Oct 14th, 09, 01:16 AM Thread Starter
Evan B
 
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Re: Beefing up the 327

Tom, I will get pictures up as soon as it gets in from NC, which should be within the next few weeks. I think we remember it being a 210 horsepower.

John, I think we are going to do the heads as well...but I'm not sure which heads yet. What is a reasonably priced aluminum head that would allow me to run a better cam? As for the carb, I think I'm pretty set on the Holley Street Avenger 570. As for the block itself, we are going to get it machined. Also, the transmission should still be running good, so a little bit more down the road I was thinking the th-350.

deerhunter, It actually wont be run that hard, and we want to keep the original motor in it since the car. This car has been in the family since it was a year old, and the motor has been taken care of.

So if it is the 210 horsepower and I get new heads,dual plane intake, cam, headers,exhaust, and a 4bbl carb, it should put out around 300hp maybe? I'm not going to go top of the line for the heads and everything, but I still want to get nice parts.

1968 Camaro Convertible
327/210hp with PG tranny
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post #10 of 20 (permalink) Old Oct 14th, 09, 09:22 AM
 
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Re: Beefing up the 327

hey texas , been doing about the same thing your fixing to do. a little at a time though for lack of money and marriage and kids . i think ace's68 hit the mark . summit has a vortec head up to .510 lift , 165 intake volume with 2.02 intake valve 1.60 exhaust for $600 a pair assembled with screw in studs . must be machined for guide plates , which is a problem if you want to run roller rockers . i found this out the hard way . partiot performance has a the cheapest aluminum ''china heads'' about the same specs but larger springs'' a little more lift'' and guide plates included about $800 assembled .i truly believe the 302 or the 327 could be the ultimate smallblock for the 1st gen camaro if built correctly .these things can rev to the moon . but with an automatic transmission i think you would be better off with a stout 350 . it all depends on what you want to do with the car and how radical you want the 327 to be . sorry this is so long , theres just to much to think about here . are you ready for 5000 clutch dumps or not .
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post #11 of 20 (permalink) Old Oct 14th, 09, 10:49 AM
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Re: Beefing up the 327

I have the 210 hp 327 in my base coupe,added msd hei,edelbrock performer,edelbrock 600 carb manuel choke,it has no problem spanking my buddies 62 impala with 350 hp 350.If you wanted a 350 couldnt you put a 350 crank in the same block??
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post #12 of 20 (permalink) Old Oct 14th, 09, 12:50 PM
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Smile Re: Beefing up the 327

No, it is never "just a crankshaft" change. The pistons also need to be changed. True a 302,327, and a 350 are all a 4.00" bore, but each stroke is different and requires its own piston, because the piston pin is in a different location for the proper compression height.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #13 of 20 (permalink) Old Oct 14th, 09, 02:10 PM Thread Starter
Evan B
 
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Re: Beefing up the 327

For the block, i talked to a machine shop yesterday and he suggested doing a .30 over bore on it while they have it. And the transmission will stay until something happens to it, or we get the money for a th-350 or muncie. But for the carb, would it be smarter to stick with the Street Avenger 570 over the 670?

I cant find that GM vortec head as a kit with those specs on summit, and that would be a cast iron head, not aluminum, correct? Is there any disadvantage to that?

1968 Camaro Convertible
327/210hp with PG tranny

Last edited by texas68camaro; Oct 14th, 09 at 02:58 PM.
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post #14 of 20 (permalink) Old Oct 14th, 09, 02:59 PM
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Thumbs down Re: Beefing up the 327

TJS69, thanks for that info,I have always been told the only difference was the crank.Do you know anything about the 327 crank kits that have 6 inch rods?
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post #15 of 20 (permalink) Old Oct 14th, 09, 03:00 PM
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Re: Beefing up the 327

that thumbs down is not supposed to be there
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