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496 HO mods....best bang for the buck.

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Old 03-20-2009, 11:36 AM
  #11
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Originally Posted by Jfever View Post
A pair of CMI's new 8.1 exhaust, low cost and simple install.


Both of which not true. THey are very pricy, and not a simple bolt on.
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Old 03-20-2009, 11:50 AM
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Originally Posted by jrz View Post
A pair of CMI's new 8.1 exhaust, low cost and simple install.
I wouldn't say they are low cost but do agree you would be diappointed with the performance gains if any. The easiest and cheapest way to gain a couple MPH is prop tweaking.
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Old 03-20-2009, 11:59 AM
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Originally Posted by tblrklakemo View Post
Both of which not true. THey are very pricy, and not a simple bolt on.
Cost is competitive to the popular cast aluminum manifolds with stainless risers.

A fairly skilled marine mechanic should be able to install this new header system, on a single, in about 2.5 hours, with time to spare.
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Old 03-20-2009, 12:02 PM
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Quote:
Originally Posted by Jfever View Post
A pair of CMI's new 8.1 exhaust, low cost and simple install.

Hi Joe from John and Carol on Paynes Point, waiting to get my 27 in with Kevin & Donna's 35 and tip a few cold ones at the Stretches.

See ya when the weather warms and ice melts.

Take care
John
Do we have to wait for the ice to melt?
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Old 03-20-2009, 01:22 PM
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if your HO has the turbonators in the stock exhaust you can remove them for about 50 rpm's
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Old 03-20-2009, 01:22 PM
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I'm Carl C on Donzi.net. I saw no gain from my $5,000 CMIs. They were a beotch to install and rendered my Q&Q useless above 3,000 rpm. They look good though. You guys are right, 5,300 would be well into the rev limiter. The shorty gave me a solid 3 mph gain. Hi Frankie.
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Old 03-20-2009, 06:32 PM
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i believe the limiter is 5150
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Old 03-20-2009, 07:04 PM
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Talk to BBlades re the prop .
Search your topic on this site will give you hours of reading and hopelully a clear mind .
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Old 03-20-2009, 10:25 PM
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Boost....let it be your friend.
http://www.whipplesuperchargers.com/...sp?ProdID=1149

Last edited by Back4More; 03-20-2009 at 10:32 PM.
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Old 03-21-2009, 09:43 AM
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Sell the motor and then buy a new one will cost about as much as CMI exhaust. I had a 496 in a Nordic Heat and I sold the motor and installed a 500efi for $2000 and gained 8mph and a lot of torque.
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