Cylinder Heads for 327 - Team Camaro Tech
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post #1 of 42 (permalink) Old Mar 22nd, 11, 08:04 AM Thread Starter
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Cylinder Heads for 327

Hi, looking to upgrade the stock cylinder heads on the 327. I purchased edelbrock RPM manifold and CAM kit a few years back along with edelbrock 600 cfm carb (have not installed yet) and would like to get cylinder heads to match.

Edelbrock lists both 64cc and 70cc with straight or angled plugs. I don't know enough to make sense of the numbers to see what would be best.

Basically, I'm looking for a street cruiser with a little giddy-up to take on the occasional mustang.

A quick search shows a few comparisons vs other mfg, but I'd like to stick all edelbrock unless there is a compelling reason to switch.

Thanks for the help.

'68 RS Convertible. 327, 4-speed, Millenium Yellow
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post #2 of 42 (permalink) Old Mar 22nd, 11, 09:05 AM
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Re: Cylinder Heads for 327

Since you want to stick with all Edelbrock I'd go with the straight plug 64cc RPM heads. They're a good match for a 327.

Mark

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

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66 Mustang coupe 6 cyl. auto
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post #3 of 42 (permalink) Old Mar 22nd, 11, 11:00 AM
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Re: Cylinder Heads for 327

I recommend the 68-69 64cc 291 castings. You can easily put in 2.02/1.6 valves in them; however, the later 64 cc 69/70 casting has the Alternator Mounting Boss and much easier to position the Alternator tightly by using the later belt arrangement.

Then again considering the cost of rebuilding the old casting go for a set of Edelbrock RPM Alu- Heads and 0-Deck the Block.

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post #4 of 42 (permalink) Old Mar 22nd, 11, 11:16 AM
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Re: Cylinder Heads for 327

The edelbrock E-Tec 170's would work the best for a mild build.

Edelbrock says these heads outflow the performer rpm by 17%. You'll need to get a vortec intake to match.
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post #5 of 42 (permalink) Old Mar 22nd, 11, 12:32 PM Thread Starter
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Re: Cylinder Heads for 327

OK, so choices are:
Performer RPM - 64cc with straight plugs @ $559 each - or -
Performer RPM E-Tec 170 64cc straight plugs @ $589.

With the e-tec, I need a new intake since they are newer style. (~$250)

Cost difference is about $300. Not too bad if the performance is much better.
What about other issues like mounting locations for accessory brackets and such? Is that something to be concerned about?

I can't get through to edelbrock tech support due to "extremely high call volume"

'68 RS Convertible. 327, 4-speed, Millenium Yellow
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Last edited by RustyBlazerDude; Mar 22nd, 11 at 12:34 PM. Reason: missed straight plugs..
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post #6 of 42 (permalink) Old Mar 22nd, 11, 01:42 PM
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Re: Cylinder Heads for 327

Chris, I would probably go with the E-Tec heads and the new intake. You can always sell the new RPM intake you have to help offset the cost of the new one.

Ron, this is an honest question. I know the BEST way would be to zero deck the block, but with the extra thick 5/8" thick deck on the E-Tec heads do you think he can get by without zero decking? I think with the correct head gasket he should be OK?

68 Camaro SS 396 - 468 BBC now, M21, 12 bolt 3.73 coded housing but w/ 3.31 gears.
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post #7 of 42 (permalink) Old Mar 22nd, 11, 02:14 PM Thread Starter
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Re: Cylinder Heads for 327

OK. Spoke with Edelbrock. They agree E-tec's are the way to go. Much better flow and high-rpm performance.
He did warn against decking the block as I may run into clearance issues with the intake manifold if I do this. Also, I'm not looking to bring up the compression too much.

They claim you can see 363HP with this set-up from a 350, so I would guess around 325HP from the 327. That should be good enough for me :-)

'68 RS Convertible. 327, 4-speed, Millenium Yellow
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post #8 of 42 (permalink) Old Mar 22nd, 11, 02:58 PM
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Re: Cylinder Heads for 327

You can get these with free shipping though streetsideauto.com plus save an additional 5% with code Edelbrock2011 or save $75 using code QUICK75
Don't forget to have them match Summit's price.

67 Convertible, LS1, T56

Last edited by rockportag03; Mar 22nd, 11 at 03:15 PM.
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post #9 of 42 (permalink) Old Mar 22nd, 11, 06:32 PM
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Re: Cylinder Heads for 327

Well these are a 8500rpm 291 Heads on top of a 331 327 - HIC! - My recommendation is "Don't Go There, Unless you want the Mill to Look STALK"

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post #10 of 42 (permalink) Old Mar 22nd, 11, 06:41 PM
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Re: Cylinder Heads for 327

You have already read my recommendations but you can't beat a Stock Old School 8000rpm 327 with 291 Heads or choose the forum recommendation for Edelbrock Alu-RPM Heads - It's Up to You - Which I agree with.





Other then Jenkins, I can COKE a Stock 327 to pull Strong through to 8000rpm pushing 425+Hp and don't give a SH*T - Other then Old School is Expensive today & the Mill remains OEM.

Gotta LOVE the 327 - Beware Hemi's & BBC's: Because I will Run Any Time

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Last edited by Z15CAM; Mar 22nd, 11 at 07:29 PM.
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post #11 of 42 (permalink) Old Mar 22nd, 11, 08:53 PM Thread Starter
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Re: Cylinder Heads for 327

8000 RPM !! I though that was 302 territory only. That's a nice job you did on your engine.

I just checked my heads are the #3917293 heads (1.72 intake valves, 1.5 exhaust, 75cc chambers) They have got to go. (on a shelf that is with the other oem stuff).
I like the idea of staying period correct with the 291 heads, but I dont know where to find them or have them ported and done up like yours. Are they readily available?

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post #12 of 42 (permalink) Old Mar 22nd, 11, 09:15 PM
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Re: Cylinder Heads for 327

I would def. go with a 64cc or smaller chamber, to get too much compression you'd need a 49cc head and almost a zero deck.
I'd call edelbrock and see if they don't already have any 58cc or 49cc heads in stock for the E-tec. I'm only at 10.8:1 on my 333" and thats with a 58cc head, .015" deck height and .025" head gasket.
You'll pick up lots of power just in the compression ratio change, I'd use a .015" or .025" head gasket it a .040-.060 bore to bump up the compression.

The only Mustang I'd ever own is a Fender.

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post #13 of 42 (permalink) Old Mar 24th, 11, 01:17 PM Thread Starter
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Re: Cylinder Heads for 327

When asked what would be better (RPM vs e-tec 170) I got this response from Summit tech department ...


Hello,
It really depends on the profile of the cam you are running. The E-tec likely will be a better match for your 327 due to the smaller runner size (170 cc) if you are using a cam that does not exceed 5,500 rpm. But if you are more in the range of 6,500 - 7,000 rpm, the RPM series head (185 cc) would be the better choice. Both are very good heads and will work well in comparison to a stock head. But if you are looking to optimize usable engine HP, the cam profile will be critical to making a selection. Thanks, Mike

Since I'm running the RPM cam (good the 6500) could the older style RPM heads be better? Does this make sense?

'68 RS Convertible. 327, 4-speed, Millenium Yellow
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post #14 of 42 (permalink) Old Mar 24th, 11, 02:59 PM
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Re: Cylinder Heads for 327

What are the specs on the cam?
I'd personally go with the E-tecs.
Little motors need all of the velocity they can get, yes, you need to match parts, but big cam, intake, and huger runners will not work well with a small ci motor that spends 99% of it's life from idle to cruise with the occasional 6k run.

What rear end gears are you running, and is it going to keep the 3spd?

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post #15 of 42 (permalink) Old Mar 24th, 11, 03:16 PM Thread Starter
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Re: Cylinder Heads for 327

Quote:
Originally Posted by ace's68 View Post
What are the specs on the cam?

What rear end gears are you running, and is it going to keep the 3spd?
Cam is: Duration 308/318, Lift .488/.510
http://www.summitracing.com/parts/EDL-7102/

3 spd is gone. Right now I have M20 4 spd, and 3.08 gears. Hopefully that will someday change to Keisler RS600 and 3.45 gears.

From what I heard here, I was leaning towards the e-tec 170, but this guy threw me a curve. If it gains me 20-30hp then its well worth the extra $ switching over the intake. If not, its certainly easier for me to just go with RPM's. I don't want to make this into a monumental issue, just want to get the best / right part for my hard earned $$.

'68 RS Convertible. 327, 4-speed, Millenium Yellow
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