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Old 08-04-2015, 06:36 PM   #43
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And for a new one this has forged crank, rods, and pistons.


454 HO Big Block Crate Engine | Chevrolet
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Old 08-04-2015, 07:13 PM   #44
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Brad, Thanks again for taking the time to help me out. With a trailer height of 42" I would be 14' tall. Too high to be legal. I think we will make the low bed work. If I remember correctly, the generator exhaust is the lowest hanging obstacle behind the axle. The trailer steps up 14". I can block up the rear wheels enough so the 9 feet behind the axle will clear that 14" step and still be legal height.
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Old 08-05-2015, 06:46 AM   #45
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Brad, Thanks again for taking the time to help me out. With a trailer height of 42" I would be 14' tall. Too high to be legal. I think we will make the low bed work. If I remember correctly, the generator exhaust is the lowest hanging obstacle behind the axle. The trailer steps up 14". I can block up the rear wheels enough so the 9 feet behind the axle will clear that 14" step and still be legal height.
Keith


1982 310 motorhome 454
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Dang, that's right. The 310 is definitely taller than an Argosy. I transported my 74 Argosy on a 42" deck trailer and it just cleared the 13'6" height requirement (at least that's what the trucker hoped!) by an inch or so.

Sorry about that

I think you're right about the genset exhaust being the only thing hanging down at the rear of the coach.

Brad
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Old 08-05-2015, 08:52 PM   #46
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And for a new one this has forged crank, rods, and pistons.


454 HO Big Block Crate Engine | Chevrolet

IMHO, forged components for an engine that makes less than 300 HP is overkill... WAY overkill.

Two bolt, cast 454s will most always go more than 100K miles without blowing up.

Dollar for dollar, the cheaper engines are a better deal for RV duty.

No pricing on that link, I am thinking probably 8K to 12k?
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Old 08-05-2015, 08:56 PM   #47
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It is a lot cheaper than I thought....

I would think about it for $5,800...

http://m.summitracing.com/parts/nal-12568774
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Old 08-05-2015, 10:00 PM   #48
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IMHO, forged components for an engine that makes less than 300 HP is overkill... WAY overkill.

Two bolt, cast 454s will most always go more than 100K miles without blowing up.

Dollar for dollar, the cheaper engines are a better deal for RV duty.
With all due respect, have you ever owned a Classic motorhome with a 454 7.4L?

1) Depending on the size moho and how hilly the terrain the moho is driven on, it wouldn't be surprising to hear a 454 in a 345 blowing up with only 50,000 miles on it after being driven through mountainous or hilly terrain. The very first 345 I looked at had 130,000 miles and he was on his third motor, fourth transmission. One motor blew in Tennessee; with our dollar at the time being worth .65 cents US, it was cheaper for him to float the coach to Canada for the engine replacement.

2) The big cost of an engine replacement is the labour to pull and replace the engine. It can easily surpass or be equal to the cost of the engine rebuild or replacement, so spending money on a cheap engine that is not specced out to pull 15,000+ lbs is courting disaster, a lot sooner than later.

IMHO unless you do the work yourself and enjoy banging knuckles in the very tight engine space of a Classic motorhome, I would strongly suggest you buy a very strongly built motor specced out with a RV cam as a replacement.

Cheers
Tony
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Old 08-05-2015, 10:18 PM   #49
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Motorhome? No. Never owned one,,,

But I do own and have owned plenty of 454 equipped trucks that we routinely load to around 26,000 pounds gross.

Just conveying my experience.

I also have noticed that it takes a lot of people a long, long, time to put 100,000 miles on a motorhome.

What is different from the 454s in these motorhomes than the typical 454s that went in the same era one tons?

I don't know, but I suspect nothing. As far as I know, forged components were not offered in passenger 454s at least from the mid seventies.

If these motorhomes had used a real truck engine, they would have used a 427 tall deck engine.
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Old 08-09-2015, 07:29 AM   #50
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Thanks to some good friends, my 310 has made it back home. Click image for larger version

Name:	ImageUploadedByAirstream Forums1439123321.531751.jpg
Views:	88
Size:	72.7 KB
ID:	245039
I appreciate the help And advice from everyone here.


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Old 08-09-2015, 08:00 AM   #51
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Awesome pic!
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Old 08-09-2015, 08:07 AM   #52
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Check with chevy dealer for complete new engine,usually the cheapest route to go, that is what we did with the truck engines when a 427 give out...
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Old 08-09-2015, 08:21 AM   #53
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Thanks to some good friends, my 310 has made it back home. Attachment 245039
I appreciate the help And advice from everyone here.


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Congrats!! Do you mind sharing what kind of bids you got from Uship for the 1000 mile trip?
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Old 08-09-2015, 08:37 AM   #54
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I would say the first task would be to pull the top of the engine and keep your fingers crossed it is something repairable in place....if not start dismantling to get the engine out.

Whether you rebuild (to a motorhome spec), drop in a used motor (and you are more any welcome to the 454 in my donor but would have to come take it outt) or drop in a Chevy Performance crate engine (454 HO Big Block Crate Engine) is totally down to budget, but lower budget = higher risk of failure (and a repeat situation) down the road.
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Old 08-09-2015, 10:21 AM   #55
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Whatever you do, it needs to be a 4 bolt main block. They are just stronger. Mine had a 6,000 mile old Jasper reman unit in it when I bought it. We will see if it survives miles or my itch to put a Cummins 6bt in there and double my mpg! There is a company out here in CA that builds a very nice BBC motor that is in the $2500 range. It makes 400hp and 500ftlb but that is on a more car based cam... I bet they could put an RV cam it it.. I will post the link when I am in front of my computer.
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Old 08-09-2015, 11:05 AM   #56
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Pay the extra bucks for a jasper engine have warranty on motor and labor nationwide
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