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Old 09-16-2003, 09:52 PM
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DonMan DonMan is offline
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Question ZZ502 cam specs ???

Does anyone know the specs for the 502/502 GM crate engine camshaft, aka: ZZ502 ?
I know the lift / dur numbers........was looking for valve overlap, I valve open/close, E valve open/close, etc......
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Old 09-16-2003, 10:24 PM
232boss 232boss is offline
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Just happen to have an old Car Craft mag that had the specs. .527"I/.544"E, 224/234dur @.050 on 110 seperation. Made 555 ft. lbs. @ 4500 rpm and 513 hp @ 5250 rpm.
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Old 09-16-2003, 10:25 PM
232boss 232boss is offline
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No ideas on the opening/closing times though.
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Old 09-17-2003, 08:50 PM
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GM Performance Parts gives all those specs in their catalog. I need the open/close numbers so I can plug them into my Desktop Dyno.
Hey, but thanks for the effort!
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Old 09-17-2003, 09:27 PM
232boss 232boss is offline
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Just to let you know the 496 is no longer there. The guy went ahead and built it and put it in a jet boat this summer-what a waste. Have you had any luck with a engine otherwise though? What head set up are you looking at? I know from experience that the edelbrock performer rpm package is pretty tough to beat. I know they only use a flat tappet cam, but until the gen vi motor that is what all bbc mercs used. I know for a fact the 540hp/540ft lbs they advertise is correct. We built one to their specs and had it dynoed and it was almost dead on at EVERY rpm-still have dyno sheet somewhere. Don't know what your budget is but that's alot of bang for the buck. Don't forget all this is with a pump gas friendly 9.5 compression
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Old 09-18-2003, 02:32 PM
GrumpyBullet GrumpyBullet is offline
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This might help you DonMan
http://www.sallee-chevrolet.com/Chev...s/502hbek.html
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Old 09-18-2003, 09:38 PM
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Quote:
Originally posted by GrumpyBullet
This might help you DonMan
http://www.sallee-chevrolet.com/Chev...s/502hbek.html
Thanks GB!
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Old 09-18-2003, 09:41 PM
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Quote:
Originally posted by 232boss
Just to let you know the 496 is no longer there. . Have you had any luck with a engine otherwise though? What head set up are you looking at?
Michael,
Thanks for the effort! I haven`t even seen my boat since Labor Day.............
I`m probably going to use the heads I already have: L29 Vortecs. The guy who used to build engines for Eddie Hill is going to do some work on them to promote flow.
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Old 05-26-2004, 10:19 PM
bskaggshd bskaggshd is offline
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Question cam for zz502

Maybe you can help me with what cam to put in to a ZZ502/502hp with out any major changes. like pistons. I want to go to a solid lifter and better springs so I can run out the rpm more that 5800. I currently run this on injected alky, at 38Degrees of timing. it is not in a boat, its in a rear engine dragster. I was told by a friend that this was the place to come to get answers on the zz502. Any help is greatly appreciated.

Thanks
Bill
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Old 05-27-2004, 08:29 AM
cstraub cstraub is offline
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Don,
E-mail me and I will send you program to figure the valve events.

Chris
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Old 05-27-2004, 09:03 AM
cfm cfm is offline
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Donman,

I thought you had Merlin's?
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Old 05-27-2004, 09:08 AM
cfm cfm is offline
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Re: cam for zz502

Quote:
Originally posted by bskaggshd
Maybe you can help me with what cam to put in to a ZZ502/502hp with out any major changes. like pistons. I want to go to a solid lifter and better springs so I can run out the rpm more that 5800. I currently run this on injected alky, at 38Degrees of timing. it is not in a boat, its in a rear engine dragster. I was told by a friend that this was the place to come to get answers on the zz502. Any help is greatly appreciated.

Thanks
Bill
Alcohol, on this low compression? I thought 13 - 14:1 was where you want to be with Alky?

Anyway, good spec's for a solid roller would be somewhere around 250 at .050" with a high rise single plane - HV/Brodix 2000 or such.

Ok, back to boats.
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