1969 zz 502 - Chevy Nova Forum
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Old 24th-June-2007, 11:54 AM   #1
rollerrat

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1969 zz 502

hey guys i am brand new here. ....and i suck on computers so bear with me..
i am putting a zz 502 in my award winning 43,000 mile 1969 L-78 nova. and hell yes i am having issues, i am wondering if any one out there has also been down this road. my biggest problem has been with header fitment.i also can help if anyone is doing this since i am almost done with my project.


i have installed a 9 in. moser w/ cal tracks and am running a 400 turbo and am trying to keep my car pristine and easily return to stock.no welding/drilling or cutting.but this header issue has pissed me off!i have tried the hooker super comps 2.125-3.5 combo. i am now looking at the hedman 2.0-3.0 header do i really need 2.125 pipe and 3.5 collecter? my 502 will make about 550 h.p (it is not stock crate) does any one have these hedmans on a zz502? i will sit back and chime in if any one has any thoughts on this thanks. rat
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Old 24th-June-2007, 01:20 PM   #2
Gates72ss
 
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Sorry can't help you with the problem but welcome to the site..........
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Old 24th-June-2007, 03:07 PM   #3
64PRONOVA
 
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Are they the same headers you used on your 396? I didn't think there was a dimensional difference as far as header fitment goes between a 396 and a 502? Maybe I'm wrong though. I never had a 502.
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Old 24th-June-2007, 03:43 PM   #4
Jeremy77nova
 
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Welcome aboard rollerrat!!! I'am sure you can get all of your questions answered on this site!!
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Old 24th-June-2007, 03:43 PM   #5
Borrelli's65SS
 
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Sanderson Headers in So. San Francisco, fabricate custom headers. They've made just about every kind of header to fit everything. A bit more expensive than mass produced, but worth the money, especially for an award winner.
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Old 24th-June-2007, 04:00 PM   #6
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Well first off I think unless you have someone custom make headers you will have some clearance issues. Especially if you have power steering. Every nova owner I have met with a BBC has had to beat a tube in a little for clearance.

If you don't want to ding your headers up any, I suggest having a custom set built.
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Old 24th-June-2007, 04:24 PM   #7
veno
 
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Spend the cash and get some one off customs, your heads if aluminum have raised exhaust ports. ans for 550 hp really a 1.875 tube will be fine. and your not going to rag on the car. so really header size is moot. hell just put the manifolds back on.....
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Old 24th-June-2007, 07:14 PM   #8
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I had custom headers made for my '64 to use with a big block and a 4-speed. If you get custom headers made, the shop will need the car with the engine to do it.

My headers cost $750 in mild steel and would have been $1,000 in stainless. I chose the mild steel though because I wanted to ceramic-coat them. They have 2-1/8" primaries with 4" collectors and are definitely "one of a kind".
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Old 24th-June-2007, 09:01 PM   #9
David&Melissa_h

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I took my non fitting header and cut it up and tacked it the way I wanted it. Then took just the header to a muffler shop and they welded it up.
So far it fits perfect..
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Old 24th-June-2007, 10:02 PM   #10
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the headman 2 inch primaries will not fit without grinding the flange to clear the headbolts ...
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Old 25th-June-2007, 12:29 AM   #11
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My 69 BB has 1 7/8 primaries into 3" collector with manual steer and everything clears,but I have no idea who makes them,they were a freebe!
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Old 26th-June-2007, 07:32 PM   #12
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Hooker 2" Comps! 1/8" between the tube and the box.
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Old 27th-June-2007, 01:10 AM   #13
tnblkc230wz
 
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Doug's header catalog list three different headers to fit your application. One of them has 2 inch primaries and 3.5 inch collectors. Check them out at www.pertronix.com.
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Old 27th-June-2007, 10:55 AM   #14
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Quote:
Originally Posted by 68chevyll View Post
Hooker 2" Comps! 1/8" between the tube and the box.
Doesn't the heat raise cain with your steering box?
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Old 27th-June-2007, 11:02 AM   #15
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At 550 hp you'd be in the 1.75" range for the primary tubes, 40+ inches long with a 3" collector. The smaller primaries will enhance the torque in the rpm range you spend the most time in. Hedman makes something you might start with.
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