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Old 01-21-2013, 11:54 PM
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Hobby Stock Engine

I am putting together another Hobby Stock and while digging through some old parts I found a set of exhaust manifolds that someone ported. When they ported the center cylinders they completely removed the center divider between the the exhaust ports. Is this advised or not, should I junk them and do another set?

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Old 01-22-2013, 06:50 AM
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sorry,just woke up.ignore my post

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Old 01-22-2013, 07:41 AM
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Quote:
Originally Posted by hobby28 View Post
I am putting together another Hobby Stock and while digging through some old parts I found a set of exhaust manifolds that someone ported. When they ported the center cylinders they completely removed the center divider between the the exhaust ports. Is this advised or not, should I junk them and do another set?
Unless the ports are divided past the flange, removing the center divider doesn't do anything one way or the other; hopefully it doesn't effect the sealing. Might have been done to allow access to the inside of the manifold for grinding.

If you use it, cut the gasket to match.
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Old 01-22-2013, 03:55 PM
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Quote:
Originally Posted by hobby28 View Post
I am putting together another Hobby Stock and while digging through some old parts I found a set of exhaust manifolds that someone ported. When they ported the center cylinders they completely removed the center divider between the the exhaust ports. Is this advised or not, should I junk them and do another set?
For the most part yes because tuned length is not really changed no mater which way it would have went. Also the volume is so much lower than the engine could use. So with manifolds its usally makes the most power with the biggest hole most flow any way that can happen is good. Since your still only about half what the engine would like at max rpm so no big deal to hog it out best you can.

Make sure to check for cracks. They crack easy once you realy dig em out.
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Old 01-22-2013, 04:29 PM
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What do the rules say about grinding on stock exhaust manifolds. If you have to cheat to win, does the win mean anything to you? Have you any honor or integrity?
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Old 01-22-2013, 05:00 PM
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What do the rules say about grinding on stock exhaust manifolds. If you have to cheat to win, does the win mean anything to you? Have you any honor or integrity?
Most hobby stock is stock unported heads but can use ported manifolds on the exhuast side. No cheating tech its good to go. Looks like they actually let you build a nice engine.
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Old 01-22-2013, 06:48 PM
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Thanks guys, I am putting a friend in an old car of mine and we are using my backup engine and spare parts to get it running. So I am using some stuff that I have never used on my personal car. I have been running the LT1 manifolds on my car so I haven't messed with the old log style manifolds a whole lot.
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