GMC motorhome Olds 455 multiport

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zerofloat
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GMC motorhome Olds 455 multiport

Post by zerofloat » Mon Sep 14, 2009 5:10 am

We have squirted a Olds 455 in a GMC motorhome and are very pleased with the results. Modified a stock cast iron manifold by brazing in injector bungs. Using a gutted q-jet with a TPS fitted for the throttle. Pics here
http://www.gmcmhphotos.com/photos/showg ... p?cat=4895

Davie Sprocket
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Re: GMC motorhome Olds 455 multiport

Post by Davie Sprocket » Thu Sep 17, 2009 8:00 pm

Very nice work. I love the injector rails. What did you have to do to the gjet to make it work as a throttle body? That shaper is awesome.

Dave

zerofloat
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Re: GMC motorhome Olds 455 multiport

Post by zerofloat » Mon Sep 21, 2009 1:42 pm

Davie Sprocket wrote:Very nice work. I love the injector rails. What did you have to do to the gjet to make it work as a throttle body? That shaper is awesome.

Dave
Dave,
Basically the q-jet needed a tps attached and all the unneeded vacuum holes plugged. I removed the choke plate, secondary flap, and the venturis. The stock q-jet will bolt right back on if I want to go back (NOT GONNA HAPPEN).

TPI 85 Blazer
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Re: GMC motorhome Olds 455 multiport

Post by TPI 85 Blazer » Thu Jan 14, 2010 7:59 am

What did this do to the fuel economy?

zerofloat
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Re: GMC motorhome Olds 455 multiport

Post by zerofloat » Thu Apr 22, 2010 12:26 pm

TPI 85 Blazer wrote:What did this do to the fuel economy?
Better by maybe 1/2 mpg. It runs WAY better.

woodwright
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Re: GMC motorhome Olds 455 multiport

Post by woodwright » Sun Apr 25, 2010 7:10 pm

Do you still get the "Q-jet sound" When you get on it?
You can pick your friends, you can pick your nose, but you can't pick your friends nose.

zerofloat
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Re: GMC motorhome Olds 455 multiport

Post by zerofloat » Thu Apr 29, 2010 8:05 pm

woodwright wrote:Do you still get the "Q-jet sound" When you get on it?
Yes it still sounds like a Q-Jet

csa000
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Re: GMC motorhome Olds 455 multiport

Post by csa000 » Mon Nov 29, 2010 7:32 am

Any further updates with it? My dad has a Revcon and we are looking into putting squirting it. Have you taken it on any trips yet? Any challenges with the installation? Good looking work you have done there.

hessdawg
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Re: GMC motorhome Olds 455 multiport

Post by hessdawg » Thu Mar 03, 2011 12:02 am

hey zerofloat
i have an olds 455 Im squirting and i was wondering if i could get your maps as a good starting point thanks brad

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