Cam gurus! get most out off zz502 cam? - Chevelle Tech
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post #1 of 19 (permalink) Old Dec 5th, 19, 1:33 PM Thread Starter
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It is time to order timing set for my 502cid peanut port engine. Cant find much info about the cam put few people here claims that it is ground 2 degrees advanced. LSA 110. ICL 108. 224/234. Adv. Duration? Zz502 peaks at 5200rpm and make almost the sama power at 5700rpm. My heads are much smaller and wont carry the power that far so i started to think, would it be wise to advance the cam 4 degrees more or something to make more torque/hp at lower rpm. I dont need power above approx 5200rpm. Can someone calculate the best valve timing events to this engine with this cam. My peanuts flow numbers are similar than zz502 heads except higher lifts (lifts over the camshaft max lift) low and mid lift flow is even better.

Intake. good/bad Avg. 2.06" valve

0.100=72cfm
0.200=154cfm
0.300=228cfm
0.400=260cfm
0.500=269cfm
0.550=269cfm

Everything is like the zz502 except heads and crane gold 1.7 roller rockers. Engine is going to a boat. I just have a feeling that in my rpm range i will waste power and torque. Any toughts?
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post #2 of 19 (permalink) Old Dec 8th, 19, 7:05 AM
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Re: Cam gurus! get most out off zz502 cam?

Throw it into the lake. by a real cam from Chris Straub.
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post #3 of 19 (permalink) Old Dec 8th, 19, 8:06 AM
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Re: Cam gurus! get most out off zz502 cam?

Quote:
Originally Posted by Tom Mobley View Post
Throw it into the lake. by a real cam from Chris Straub.
He can send it to me instead, as a budget cam in a mild build its a decent cam used several over the years in 454s one with Edelbrock rovals, a couple with oem ovals and even in a 496 with brodix race rite heads.

Op this is a decent timing set
Rollmaster CS2090
Or budget the Chevrolet performance
https://www.summitracing.com/parts/n...make/chevrolet
Comes with cam retainer plate and hardware but only comes with one keyway crank gear.
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post #4 of 19 (permalink) Old Dec 8th, 19, 1:22 PM Thread Starter
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Quote:
Originally Posted by Tom Mobley View Post
Throw it into the lake. by a real cam from Chris Straub.
That would be perfect but out of my budget.
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post #5 of 19 (permalink) Old Dec 8th, 19, 1:32 PM Thread Starter
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Quote:
Originally Posted by Malibu ss 64 View Post
Quote:
Originally Posted by Tom Mobley View Post
Throw it into the lake. by a real cam from Chris Straub.
He can send it to me instead, as a budget cam in a mild build its a decent cam used several over the years in 454’s one with Edelbrock rovals, a couple with oem ovals and even in a 496 with brodix race rite heads.

Op this is a decent timing set
Rollmaster CS2090
Or budget the Chevrolet performance
https://www.summitracing.com/parts/n...make/chevrolet
Comes with cam retainer plate and hardware but only comes with one keyway crank gear.
Cam is like new and has seen only few dyno hours. Have you always timed these to 108 ICL?
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post #6 of 19 (permalink) Old Dec 8th, 19, 2:23 PM
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Re: Cam gurus! get most out off zz502 cam?

I have a couple of them and they are nicely made cams. For your application I think you're good to go. This cam was a compromise between high HP and longevity just like a production engine. Based off info from Straub this was made for the GMPP/Edelbrock heads based off the total and .050 duration. I'd put it in straight up since lower head flow needs more duration to compensate.
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post #7 of 19 (permalink) Old Dec 8th, 19, 3:06 PM
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Re: Cam gurus! get most out off zz502 cam?

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Originally Posted by Janih View Post
Cam is like new and has seen only few dyno hours. Have you always timed these to 108 ICL?
I found these nrs several years ago and checked the valve timing events with the Chevrolet timing set and all of them was correct against the valve timing events on the picture. Think the intake centerline ended up at 108 and think that is correct and the info of 110 on the picture is wrong but not sure?
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post #8 of 19 (permalink) Old Dec 8th, 19, 4:21 PM Thread Starter
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Quote:
Originally Posted by Janih View Post
Cam is like new and has seen only few dyno hours. Have you always timed these to 108 ICL?
I found these nr’s several years ago and checked the valve timing events with the Chevrolet timing set and all of them was correct against the valve timing events on the picture. Think the intake centerline ended up at 108 and think that is correct and the info of 110 on the picture is wrong but not sure?
Did you ever measure seat to seat duration? That would be nice info. Hard to calculate dynamic compression without advertised duration numbers.
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post #9 of 19 (permalink) Old Dec 8th, 19, 4:24 PM
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Re: Cam gurus! get most out off zz502 cam?

Advertised is 294/304 durations.

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post #10 of 19 (permalink) Old Dec 9th, 19, 12:20 AM
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Re: Cam gurus! get most out off zz502 cam?

Straub use to advertise a cam specifically for the ZZ502. Would be worth looking into. Or maybe one of the Clay Smith grinds he designed would work for you.
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post #11 of 19 (permalink) Old Dec 10th, 19, 10:54 PM
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Re: Cam gurus! get most out off zz502 cam?

Those are billet Crane Cams ( iron gear) made for GM . They make a great core and can be reground

a stock zz 502 would be a nice mild cam for a 396 / 427
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post #12 of 19 (permalink) Old Jan 5th, 20, 6:34 AM Thread Starter
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Re: Cam gurus! get most out off zz502 cam?

Gm performance did not give me cam card for this cam when i asked, so i measured it.

0.004"=297*/304*
0.006"=286*/294*
0.050"=224*/232*

Intake closing @ 0.006"

ICL=108*=71* abdc
ICL=106*=69* abdc
ICL=104*=67* abdc
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post #13 of 19 (permalink) Old Jan 5th, 20, 12:50 PM
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Re: Cam gurus! get most out off zz502 cam?

All cams are compromises.

I've always liked the ZZ502 cam. The lift is reasonable and doesn't require expensive roller rockers (that tend to exacerbate valve float).

It makes a great marine or street cam as the torque curve will be nice and flat.
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post #14 of 19 (permalink) Old Jan 5th, 20, 2:41 PM
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Re: Cam gurus! get most out off zz502 cam?

Nice thing about the ZZ502 cam is that it's easy on valvetrain parts.
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post #15 of 19 (permalink) Old Jan 5th, 20, 3:09 PM Thread Starter
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Re: Cam gurus! get most out off zz502 cam?

Going to use 1.7 crane gold roller rockers. just going to my garage to measure how much crane golds gives more valve lift, Wizard claims that they 1.77 in real world.
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