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Old 04-04-2019, 11:22 PM   #1
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1978 Engine and Trans Rebuild

Hello all, Just showing off my engine rebuild I started last fall
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Old 04-04-2019, 11:27 PM   #2
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Now that a very big project.
I see your very neat and tidy.
And
You have a good helper.
Thanks for sharing
Enjoy
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Old 04-04-2019, 11:29 PM   #3
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engine is a 403 oldsmobile bore .040 over- added forged pistons-H beam rods-aluminum cylinder heads-roller rockers-edelbrock intake- high pressure and volume pump- Still trying to decide on what fuel system to use
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Old 04-11-2019, 05:55 PM   #4
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Jim Bounds at GMCCoop had several castings made with bungs molded into the runners. These were made so they could be drilled for port injection. These intakes were flat with no rise, as they needed to still fit below the floor.



After having done port injection on my 502, I'm a big fan of it. Much better than throttle body.
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Old 04-11-2019, 11:18 PM   #5
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I am trying to decide on what EFI fuel system to go with- I like the Holley Sniper so far but I see K&N has a simple fuel injection system that goes under the carb. I just cant find anyone that has used it. I also need to modify the engine cover due to taller intake. Only intake I could use with the 455 heads on a 403. Never thought of the port injection.
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Old 04-12-2019, 06:16 AM   #6
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I like the way the complete assembly just "rolls" out from under the motorhome. Nice job on the rebuild.
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Old 04-12-2019, 06:27 AM   #7
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Add a nitrous system for powering up steep grades ;-)
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Old 04-12-2019, 01:13 PM   #8
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Quote:
Originally Posted by Wrktfsh View Post
Add a nitrous system for powering up steep grades ;-)
I actually thought about that prior, just doing a small 100 horse kit.
I like the yearly trip to and from Myrtle Beach South Carolina from Michigan. I like to take the big hill Fancy Gap-- North carolina - Virginia. 7% grade for 7 miles. 1st year I had to pull to the side to cool trans and engine. Next year I installed twin Hayden engine oil and trans oil coolers with fans about half way back under neath motorhome. Also went with the Hayden severe duty fan clutch. I made it last year non stop but only topped hill at 30MPH. Not bad being it was mid aftrenoon 90 degree day. Looking forward to a trip this summer being the old engine was OEM rated around 180 and now I will be very close to 400 HP .
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Old 04-12-2019, 08:33 PM   #9
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Quote:
Originally Posted by MCH1JDV View Post
I am trying to decide on what EFI fuel system to go with- I like the Holley Sniper so far but I see K&N has a simple fuel injection system that goes under the carb. I just cant find anyone that has used it. I also need to modify the engine cover due to taller intake. Only intake I could use with the 455 heads on a 403. Never thought of the port injection.
Except for cold starts and high altitude correction, throttle body may actually perform worse than a well tuned carb. One of the problems is that historically, a low pressure injector will not atomize the fuel as well as a carb. The second issue is that to help atomize the fuel, the intake is heated. The problem with that is that the heat causes the air to expand. As a result, you can not fit as much air in the intake. Thirdly, if you are mixing fuel, that means the fuel is taking up space in the intake. Lastly the intake tube length is limited, because if the travels too far, the fuel falls out of the air. This limits the intake design.

Port injection sprays the fuel on the intake valve. The heat on the valve atomizes the fuel. It also helps to cool the intake.

Oh, there is one other advantage. If you heat the intake, the underside of the intake is also heated. That means that oil that sprays on the bottom of the intake gets burnt. This shortens the life of the oil.
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