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Old 06-25-2007, 07:08 PM   #15
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1977 31' Excella 500
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632!

How about a World Products Merlin 632

She'll make 800hp and 600+ ft-lbs of torque. They'll call you The Silver Bullet!
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Old 06-25-2007, 07:40 PM   #16
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1979 28' Airstream Excella 28
Bakersfield , California
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Hello,
I have ordered a HT502 today for replacement of my 454 in my 79 Excella. The engine is about $5400 and has the following:
1. 480 lb-ft torque at 1750 rpm
2. 512 lb-ft torque at 2800 rpm
3. 338 HP at 4500 rpm
I will have to replace my carburator, intake and add an electric fuel pump. I am excited to see and feel the gain in hill climbing expecially with the Thourley "Y" headers, Eldebrock intake and fresh air intake for the air cleaner. We should have it back together in about 30 days or so. I will take photos as it progresses. I agree in the above thread about getting hot air out of the engine box area. I will figure this out and make sure it works. I like the twin fans above because when you need cooling the most you are going the slowest and the fan robs HP. The elec fans will pull air all the time or we set it up on a thermostate it can be tied to water temperature with ac override switch.
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Old 06-26-2007, 08:40 AM   #17
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Where are you getting the 502? that sounds like a good price
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Old 06-26-2007, 11:32 PM   #18
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1979 28' Airstream Excella 28
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Hello,
I have purchased numerous crate motors from Motor City GMC dealership in Bakersfield. You should be able to get most anywhere for around $5400. If have any issues tell them you are a jobber and want jobber pricing. I will keep the forum posted with my progress. I hope to have it installed starting in about a week. It has to come form Michigan. This is not a dealer stock item. They indicated it takes about 5 working days to get out west. I will have to add an electric fuel pump. I had the exhaust done today for the "Y" headers and fitted.
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Old 06-27-2007, 03:27 AM   #19
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1986 32' Excella
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for good coolers take a look @ MuscleMotorSports
I have a large aluminium radiator and oil cooler from them for a fraction of the cost new.
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Old 07-02-2007, 11:28 PM   #20
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Update:
I took delivery of the HT502 today and took my 79 Excella to my mechanic who will get started. I had previously installed a gear vendor over drive but still need more power for big hills and towing a trailer. I will post some photos as the project starts.
This weekend I mounted a large trans cooler up front, passenger side behind the grille. I hope this plus a cool tube trans pan should keep the temperature of the fluid below 200 degrees except for short loads. I ordered a elderbrock #3761 intake manifold today that should help give more torque also. This does have the egr connection for California smog requirements.
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Old 08-20-2007, 08:41 AM   #21
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1988 32.5' Airstream 325
Groveland , California
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HT 502 Conversion

I've followed this discussion with great interest because I wish to make the same swap in my 88 MH 325. There have been no entries since 7/02. How is the installation going? I have some specific questions as I live in California also:
1) Does the engine meet CA smog with the Edelbrock manifold?
2) Did you go for a new HD aluminum radiator with electric fans or use the old radiator?
3) Did you use the Edelbrock high output water pump?
4) Are you using engine oil cooler and a trans oil cooler as well?

I'd love to see the conversion at any stage and could fly down to Bakersfield to see it if that would be possible.
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Old 08-20-2007, 11:35 AM   #22
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I'd adapt the fuel injection setup from a 496 to your 502. Or, just get a stand alone fuel injection setup from Holley or Edelbrock. With that, you'd easily meet your emissions regs. Unless I'm mistaken, you should have to meet the regs of the year of the chassis; so it's a 1988 set of regs. You could easily meet those with a modern fuel injection setup.
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Old 08-20-2007, 01:21 PM   #23
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The best solution would be to get a wrecked vehicle and bring the engine and tranny up to more modern standards.
The second best would be to buy a crate motor.
The third best would be to rebuild the old motor.

If you go with option 2 or 3 go with a throttle body or port injected fuel system.
I have a Howell system on my Jeep. These are good people and will build a system to the exact engine/cam setup you have. These systems use all off the shelf GM parts and can be worked on by anyone who knows GM products. Took an old carbureted engine and really livened it up. Drivability is very good! Edlebrock systems are good but very pricey. Holly systems are not recommended.
Howell Engine Developments Inc. - Home

When you build your exhaust you may want to go with a single 3" diameter system for good torque and good flow. I use a Magnaflow muffler which has good flow plus a good sound.
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