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chevy 502 exhaust reversion question???

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Old 12-11-2018, 09:14 PM
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Originally Posted by hogie roll


That elbow radius looks brutal and those manifolds aren’t as good as headers.
Thanks for noticing and mentionion this. Idid not look before.

Can you even call that a radius ? It's a 90*F as it appears from here. What the hell ?

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Old 12-12-2018, 08:37 AM
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I would say yes your going to get some reversion with that cam, I had the same problem this year using 496 risers, I made some risers very close to what crude intentions bought and my cam was a little smaller lift than yours.
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Old 12-12-2018, 12:15 PM
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OT Do you idle a lot of the time. And if so what rpm. Also was the engine built for auto or marine? I've ran some very questionable cams in my earlier years of boating. That was back when reversion wasn't discussed much and good forums such as OSO where not around to get good helpful info from caring others. I would imagine you'd undoubtedly see some reversion. If the deal is right and the engine is marine spec you can always swap out cam. Just my advice is all. Good luck.
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Old 12-12-2018, 12:21 PM
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Where does the water mix on those risers?
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Old 12-12-2018, 01:17 PM
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it mixes at the end of the riser. where the riser clamps in the rubber boot right next to the transom.
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Old 12-12-2018, 01:20 PM
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we like to idle around. I would say just a little above idle. 1000-1200 rpm. motor was buld for multi purpose. marine grade parts and gaskets but he was going to put it in a car. I thought about putting a different cam but them I'm losing power and would add more money on it
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Old 12-12-2018, 02:09 PM
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Originally Posted by chopperkell
it mixes at the end of the riser. where the riser clamps in the rubber boot right next to the transom.
These are the risers I made to stop my reversion the inner ends just as it turns before where it fits the transom. From what I found out before I got it to work is height is your friend!

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Old 12-12-2018, 02:39 PM
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that looks great. wish I could do that... did you have one that didn't go up as high and have reversion issues? like mine ?
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Old 12-12-2018, 02:46 PM
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Originally Posted by chopperkell
that looks great. wish I could do that... did you have one that didn't go up as high and have reversion issues? like mine ?
Yes the stock 496 risers which are higher than yours but a little shorter after the turn, we have a long-ish no wake zone probably 10-15 minutes at 1500 rpm before you can give it, it would revert bad!!!!
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Old 12-12-2018, 03:24 PM
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Originally Posted by Camalot
Yes the stock 496 risers which are higher than yours but a little shorter after the turn, we have a long-ish no wake zone probably 10-15 minutes at 1500 rpm before you can give it, it would revert bad!!!!
Where did your water mix and what cam? Sorry if you mentioned in earlier post.
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