GMC motorhome Olds 455 multiport

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zerofloat
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GMC motorhome Olds 455 multiport

Post by zerofloat »

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 »

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 »

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 »

What did this do to the fuel economy?
zerofloat
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Re: GMC motorhome Olds 455 multiport

Post by zerofloat »

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 »

Do you still get the "Q-jet sound" When you get on it?
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zerofloat
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Re: GMC motorhome Olds 455 multiport

Post by zerofloat »

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 »

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 »

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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