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Old 03-28-2004, 11:46 AM   #57
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For the Record

The 502 is simply a bored out 454. Stroke is the same (4.00"), but the bore is much larger (4.468") vs stock (4.250"). The block is different as the bores are siamesed (sic) similar the the small block 400. This allows the larger bore.

The only time height should come into question is if you are using a heavy duyt truck (6500 series and up) 454,427,402 block as it is taller. Those blocks are used for the really big motors 500-600 cu in. They are known as tall deck blocks. You should never run into them unless you specify one for your buildup. Cost to build is significantly higher than the std. block.

Octane rating is dependent on many factors, however, size alone is not the determining factor. Compression ratio, timing, head material, etc. all drive the octane equation. A 502 with stock or near stock compression of the 454 , timed correctly, should run on regular fuel. Increased compression and a performance cam might dictate a change to higher octane fuel. Ask the builder what is recommended. Higher octane used in an engine that does not require it, is wasting money. Your engine doesn't care so long as it doesn't detonate and knock.

Take care,
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Old 02-23-2007, 06:35 AM   #58
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Crate engine

I see a lot of posts about crate engines but I don't really know what the term means. I know that rebuilds come in short blocks ( no heads included ) and long blocks (heads included). Just what are "crate engines"
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Old 02-23-2007, 06:45 AM   #59
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From Wikipedia:
Quote:
A crate engine is a complete replacement, generally a fairly high performance engine. What distinguishes a crate engine from other replacement engines is that it is a complete, pre-packaged, new-build solution, already packed in a shipping crate (hence the name) ready to be bought off-the-shelf. The crate engine provides a quick, simple, guaranteed motor. Many are built up by the original equipment manufacturer, while others are assembled by specialist firms.
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Old 02-23-2007, 06:54 AM   #60
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Do crate engines include accessories such as carburetion, alternator, exhaust manifolds, ignition?
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Old 02-23-2007, 07:50 AM   #61
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You can buy any combination you need in a crate engine. Complete is nice but you have to take the heads and carb/intake off to wiggle it into place anyway....so. It may depend on the condition of your accessories or the size of your budget.
Just remember that most big block rebuilds are for race spec. You have to build for torque at lower rpm's.
Is this what we need?
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Old 02-23-2007, 12:48 PM   #62
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I have been using the 502 for three years now and it is doing eveything I had hoped it would. At 50 mph it is running 400 rpm lower than before and that is also ture at 60 mph. The low end power is great and with a tow car I don't even feel it is there, even going over mountain passes. I did have to change the timing for regular gas. But it runs fine now No real impovement in milage with around 8 mpg with the car and no diffeent with out the car. The dog house had to be rebuilt to clear the air cleaner. I am now sold that it was the right thing to do. jfuller
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Old 02-27-2007, 09:48 PM   #63
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Quote:
Originally Posted by jfuller
I have been using the 502 for three years now and it is doing eveything I had hoped it would. At 50 mph it is running 400 rpm lower than before and that is also ture at 60 mph. The low end power is great and with a tow car I don't even feel it is there, even going over mountain passes. I did have to change the timing for regular gas. But it runs fine now No real impovement in milage with around 8 mpg with the car and no diffeent with out the car. The dog house had to be rebuilt to clear the air cleaner. I am now sold that it was the right thing to do. jfuller
The improvements in power sound great but I'm baffled as to how the rpms would drop just because of an engine replacement. Did you change the transmission or something else not mentioned?

Brad
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Old 02-27-2007, 11:05 PM   #64
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Quote:
Originally Posted by bkahler
The improvements in power sound great but I'm baffled as to how the rpms would drop just because of an engine replacement. Did you change the transmission or something else not mentioned?

Brad
What kind of tranny? - Is it a overdrive unit?
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Old 03-27-2007, 12:52 AM   #65
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Mh Service Garages

Is there a nationwide or zone licensed list of AS repair garages ?
I live in Jupiter Florida and want to be able to have a reliable, experienced service outlet to contact for my new-to-me '83 310 TD MH. This would include regular maintenance and or light to heavy repair work.
Any, all responses will be appreciated.

Richard
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Old 03-27-2007, 10:14 AM   #66
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The Airstream web site will give you a list of Airstream dealers. Few, if any, of these dealers will be able to provide maintenance on your Isuzu engine or Chevy chassis.

For the engine you should find a local shop which works on these engines. You can find an Isuzu truck dealer at the Isuzu Commercial Vehicle web site Isuzu Commercial Vehicles - Dealer Locator.

For the chassis, try a Chevy/GM truck center.
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Old 04-04-2007, 09:49 PM   #67
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I replace 2 engine in 345

I replace 2 engines in 345 takes less than 10 hours pulling through the floor.
Started in the morning on the road that night.
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Old 04-04-2007, 10:50 PM   #68
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gauges

My dad has always had three gauges he drives by. Oil pressure, engine temperature and transmission temperature. Floor the gas and watch the gauges, they will tell you when your outta' hand. He's never had an engine or transmission let him down.
Seriously, the tranny temp will really surprise you on a long incline and if monitored, will make an automatic last forever.

My '87 SOB rv 454 had 104k miles, 5000 hours on the genset, and was PERFECT due to it's regular use and maintenaince, until Katrina ate it. I think lack of use will kill an RV quicker than lack of service.
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Old 12-26-2009, 12:19 PM   #69
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Driving by the gauges is the name of the game!
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Old 01-02-2010, 11:13 PM   #70
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Originally Posted by Mike Leary View Post
Driving by the gauges is the name of the game!
Yes, one of the 1st things I want to do is order a kit with 3 gauges and complete wiring kit !

1. Transmission Fluid
drill a hole in the transmission fluid pan and install temperature probe

2. Engine Temp gauge, Cooling Fluid, install in port close to the thermostat as has been recommended

3. Engine Oil Temp gauge

I plan to mount the cluster on the Dash in Clear View over the steering Wheel

My eyes are not what they Were ???
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