ZZ4 heads on a 327? - Team Camaro Tech
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post #1 of 19 (permalink) Old Jan 26th, 09, 08:37 AM Thread Starter
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ZZ4 heads on a 327?

Will ZZ4 aluminum heads fit on a '68 327? Would this require a different intake or headers? I'm looking to get rid of my 487X heads (76cc) and get a set of 64cc camel humps of possibly the 58cc ZZ4 heads.
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post #2 of 19 (permalink) Old Jan 26th, 09, 09:19 AM
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Re: ZZ4 heads on a 327?

Yes, you can bolt the ZZ4 heads on your 327. The intake is the same bolt pattern. The exhaust ports might be slightly higher (I can't remember) but your headers should probably fit OK. You should probably replace your pushrods at the same time because I think the length required for those heads may be slightly different (again I can't remember). Others here will probably know.

Some of the ZZ4 heads had guideplates and you can use a standard rocker arm and some of those heads had no guideplates so you must use self-aligning rockers.
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post #3 of 19 (permalink) Old Jan 26th, 09, 04:39 PM
 
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Re: ZZ4 heads on a 327?

Are they the L-98 aluminum 'Vette heads??

If so, they should have 58 cc chambers and 155 cc or so intake ports.

Just asking...

Might want to re-think them????

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post #4 of 19 (permalink) Old Jan 26th, 09, 06:17 PM
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Re: ZZ4 heads on a 327?

According to my old Chevy Power catalog, the ZZ4 used "12556463 Aluminum Cylinder heads, 58cc combustion chambers" 1.94 intake, 1.50 exhaust with 0.100" raised exhaust runners and D-shaped exhaust ports. Center-bolt valve covers.

Depending on your pistons, the 58cc chambers might be an issue. Could end up with crazy compression ratio or physical interference between the piston dome and the cyl head.

Also, I think these use the 87+ intake manifold bolt angle (not sure) so you may need a new intake. You'll definitely need new valve covers (center bolt)

With the raised D-shaped exh. ports, your headers will probably bolt up, but you MAY have issues with the headers obstructing part of the exh port.

Yeah, I know. That's a lot of maybes. Fundamentally, they'll fit the 327, just need to be mindful of all the details.
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post #5 of 19 (permalink) Old Jan 27th, 09, 04:39 AM
 
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Re: ZZ4 heads on a 327?

Personally, I wouldn't use the L-98 head.

There's much better out there today.

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post #6 of 19 (permalink) Old Jan 27th, 09, 08:21 AM Thread Starter
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Re: ZZ4 heads on a 327?

Thanks for all your input...I think I'll take the Vortec route.
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post #7 of 19 (permalink) Old Jan 27th, 09, 09:04 AM
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Re: ZZ4 heads on a 327?

I used these heads on a 383 a couple years ago. I felt that they held the engine back at higher RPM due to small intake runners but they made great torque at 2000-4000.

They do not require the newer Vortec style intake.
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post #8 of 19 (permalink) Old Jan 27th, 09, 05:06 PM
 
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Re: ZZ4 heads on a 327?

That's what I'm getting at, the intake ports are almost too small for a hoped up 283!

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post #9 of 19 (permalink) Old Jan 27th, 09, 08:35 PM
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Re: ZZ4 heads on a 327?

they're cheap for aluminum heads. thats a big plus.

69 X-44 base coupe, ZZ4, 16lb nodular flywheel, Center force DF clutch + PP, Holley 600DP, Hooker super comp 1 3/4 ceramics, 2.5" dual exhaust w/ X-pipe, flowmaster 40 series mufflers.
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post #10 of 19 (permalink) Old Jan 27th, 09, 09:14 PM
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Re: ZZ4 heads on a 327?

If your 327 was equipped with 75-76cc heads it likely has or had stock 4 valve relief eye brow pistons (around 8.75:1).
Throwin a set of 58cc aluminum heads and a thin .025" head gasket assuming your deck height is stock your compression would be around 9.8:1 or so? off the top of my head.

That is totally do able on pump gas. I changed from the 76cc heads to 58cc decked block and all on a 327 I have around 10.8:1 and it loves every bit of compression. The heads I use have around 190cc intake ports and imho are WAY TOO BIG for the rpm band I use. You may see great gains from the 155 58 cc head. 175 is what intake runner would be best suited for an average 6,500rpm 327.

But I really don't know how big of a diff 155cc is compared to 190cc runners.

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

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post #11 of 19 (permalink) Old Jan 27th, 09, 09:28 PM
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Re: ZZ4 heads on a 327?

the zz4 heads flow 163 cfm and produce 355 hp on a 350 cid. seems to be a decent choice for a 327 especially as cheap as they are (unless you're shootning for more than 350hp).

69 X-44 base coupe, ZZ4, 16lb nodular flywheel, Center force DF clutch + PP, Holley 600DP, Hooker super comp 1 3/4 ceramics, 2.5" dual exhaust w/ X-pipe, flowmaster 40 series mufflers.
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post #12 of 19 (permalink) Old Jan 28th, 09, 06:43 AM Thread Starter
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Re: ZZ4 heads on a 327?

350 HP would be about the max I'd want out of this motor. This car is mostly a weekend cruiser...No racing...Just looking for a nice bump in torque and HP in the 2500RPM to 5500 RPM range."Cheap" is the right answer. I can pick this set up for about $250. I can probably get Vortecs for $300 -$400 but would also need the intake, rockers, etc... This would end up around $600 to $650.
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post #13 of 19 (permalink) Old Jan 28th, 09, 09:30 AM
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Re: ZZ4 heads on a 327?

If you want power & torque to 5000 rpm or so, I would not ignore the ZZ4 heads. If you want power at higher RPM they probably are not what you would want.

The ZZ4 at 10:1 makes 355 HP & 405 ft/lbs. Not bad for a mild 350. The cam is 208/221 @ .050" with .474/.510 lift. Intake is dual plane

An engine builder I know says he has seen close to 20 additional HP on a dyno with the addition of 1.6 roller rockers (stock ZZ4 rockers are 1.5 stamped steel) and some intake port matching.

The ZZ4 has a roller cam which helps with power & your 327 likely won't have that but you should still do OK with ZZ4 heads if you are not looking for a 6500 RPM engine. Remember: Fun on the street is all about torque!

Good luck
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post #14 of 19 (permalink) Old Jan 28th, 09, 09:40 AM
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Re: ZZ4 heads on a 327?

Quote:
Originally Posted by kknapp433 View Post
350 HP would be about the max I'd want out of this motor. This car is mostly a weekend cruiser...No racing...Just looking for a nice bump in torque and HP in the 2500RPM to 5500 RPM range."Cheap" is the right answer. I can pick this set up for about $250. I can probably get Vortecs for $300 -$400 but would also need the intake, rockers, etc... This would end up around $600 to $650.
I'd say the zz4 heads would be about maxed out in power by 5,500rpm especially with a tiny cam.
you will have loads of low end torque from the get go until 5,500rpm.
when I had the coked up smogger heads and a few bolt ons it felt as if power dropped off at 5,500rpm but had no prob reving to 7,200rpm which is pretty much pointless though.

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

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'14 5.0 Mustang
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post #15 of 19 (permalink) Old Jan 28th, 09, 09:57 AM
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Re: ZZ4 heads on a 327?

For a CHEAP upgrade the ZZ4s or a set of 305 601 or 416 castings with 1.84in. and 1.5ex.Are a good head for a street 327 with flat top pistons.Both heads will run out of steam around 5500 or so rpms.The 487s you have are one of the best flowing 76cc stock heads their are.

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