ZZ4 Camshaft experiences...My stock cam V/S ZZ4 Cam - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-22-2008, 07:52 AM
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ZZ4 Camshaft experiences...My stock cam V/S ZZ4 Cam

Hi,like you know im building my 350 TPI engine all over .030 bored
any of you has used the ZZ4 Cam ?
i did a search but didnt find experiences with it.....
any dramatic changes ?
its not much over the stock one
Here are the specs :

ZZ4
Duration @ 0.050" Lift: 208/221
Lift: .474"/.510"
Lobe Separation: 112

Stock cam :
duration @ .050", 202/207
Lift .413/.428 lift,
114.5 LSA.

what should i expect ?

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Old 01-22-2008, 08:23 AM
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You will see some improvement, but don't expect a lumpy idle, the ZZ4 camshaft is pretty mild mannered.

Vince
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Old 01-22-2008, 08:25 AM
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good,i don't care for the lumpy idle
how much improvement should i expect ?
or what does it feel ?
sorry about so many questions
im just eager to test it !
thanx
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Old 01-22-2008, 09:23 AM
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The 'Hot Cam " offered by Chevrolet is a much better camshaft ... IMHO if you are planning on buying a camshaft. Not really a lumpy cam ... but worth 25 more horsepower than a ZZ4 camshaft.

Lots of ZZ4 owners have upgraded to the " Hot Cam " with good results.

.
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Old 01-22-2008, 09:52 AM
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I already have the ZZ4 right here
i didnt want the Hot cam because it read that my computer will need a retune
and the ZZ4 its a bolt on ...
whats the difference between the ZZ4 and the HOT CAM ?
Thanx
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Old 01-22-2008, 10:28 AM
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The GM ZZ4 "hot cam" has more lift and more duration and is designed to work with 1.6 ratio rocker arms which add a little more lift. As an example the GM Parts Performance Fastburn 350 is rated at 385hp. Simply adding the "hot cam" kit raises the hp to 430.

Vince
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Old 01-22-2008, 10:49 AM
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thats a lot
how much power the ZZ4 do you think will add to my stock L98 ?
Stock its rated :
Horsepower 240 hp @ 4,000 rpm
Torque 345 lb-ft @ 3,200 rpm
i also got zz4 springs (but in blue) and zz4 stock rocker arms (non roller)
thanx
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Old 01-25-2008, 07:53 PM
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Quote:
Originally Posted by 302 Z28
The GM ZZ4 "hot cam" has more lift and more duration and is designed to work with 1.6 ratio rocker arms which add a little more lift. As an example the GM Parts Performance Fastburn 350 is rated at 385hp. Simply adding the "hot cam" kit raises the hp to 430.

Vince
Actually there is no such thing as a ZZ4 hotcam, teh GM cam that is designed for 1.6 rockers is the LT4 HOTCAM with 218°/228° on a 112°LSA with .492"/.492? with 1.5's rockers or .525"/.525" with 1.6's.

The 385 hp Fastburn 350 uses 1.5 rockers with teh ZZ4 cam (208°/221° .474"/.510" lift on a 112°LSA) then adding 1.6:1 rockers AND teh LT4 Hotcam brings the Fasburn 385 up to teh ZZ430 numbers of 430 hp.

peace
Hog
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