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413 Motorhome engine questions
#1412266
03/31/13 04:35 PM
03/31/13 04:35 PM
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Joined: Mar 2013
Posts: 11
Albuquerque, New Mexico
66coronet500
OP
member
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OP
member
Joined: Mar 2013
Posts: 11
Albuquerque, New Mexico
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I have a 1966 Coronet 500, 318 poly, auto from factory now- no engine and set up for a 4spd. Bought a 413 for 200.00 then found out it was a motorhome engine. WTF- NO REFUNDS. Ok, so now its a budget rebuild with my son. I have 915 heads, Intake, distributor, car style water pump, bigger cam and lifters. Here are my questions:
1. Can I use the rocker arm assy's?
2. Can I use the push rods?
3. Can I use the oil pan?
4. It has a"thick" harmonic balancer, should I change this? Will belts line up?
5. Has a 6 hole crank, can I use my stock 4spd set up?
Thanks!
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Re: 413 Motorhome engine questions
[Re: 66coronet500]
#1412270
03/31/13 11:15 PM
03/31/13 11:15 PM
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Joined: Jan 2003
Posts: 18,414
UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 18,414
UPPER MICHIGAN, MARQUETTE COUN...
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Quote:
1. Can I use the rocker arm assy's? Should work
2. Can I use the push rods? Maybe depending on lifters and required length needed.
3. Can I use the oil pan? No.
4. It has a"thick" harmonic balancer, should I change this? Will belts line up? 413 should be steel crank. Sounds like you have a cast crank balancer. Mixed bag here so who knows what will line up??
5. Has a 6 hole crank, can I use my stock 4spd set up?
Better double check the crank. If its cast you will need the correct flywheel. From your balancer question you had better identify the crank. Also make sure there is a pilot hole.
It most likely will be a very low compression motor. I would be looking for a better motor.
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Re: 413 Motorhome engine questions
[Re: 66coronet500]
#1412273
04/01/13 01:31 PM
04/01/13 01:31 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
I have a 1966 Coronet 500, 318 poly, auto from factory now- no engine and set up for a 4spd. Bought a 413 for 200.00 then found out it was a motorhome engine. WTF- NO REFUNDS. Ok, so now its a budget rebuild with my son. I have 915 heads, Intake, distributor, car style water pump, bigger cam and lifters. Here are my questions:
1. Can I use the rocker arm assy's?
2. Can I use the push rods?
3. Can I use the oil pan?
4. It has a"thick" harmonic balancer, should I change this? Will belts line up?
5. Has a 6 hole crank, can I use my stock 4spd set up?
Thanks!
Hi 66 ... got your PM on this topic ...glad to help out.
FIRST ..... how clean is the inside of the motor? MOST I havwe seen are in good shape.... low miles plus when they are used they are worked hard - so very little sludge build-up.
Ok ...rockers are the same. P-rods .....are longer with the goofy heads. NO on the oil pan. The balancer ?.... is a really NICE PIECE ... but very true ... getting stuff to line-up is going to be a bummer. I am thinking about having a custom crank pulley made. Those are INTERNALLY balanced motors ....so a regular car balancer should just slip on. IF you did this ... the TC cover would also have to be changed.
That crank and your 4 speed ? ....IIRC .... the ones I remember looking at DID HAVE a bushing in there.
And as Double N said ..... these motors have patheticly LOW compression ratio. I would take those 915 heads and shave them 60 to 90.
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Re: 413 Motorhome engine questions
[Re: Bumbalawski]
#1412277
04/03/13 06:27 PM
04/03/13 06:27 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
As it was mentioned earlier, those industrial headed MH 413's have a very heavy 4 ring piston. And they have LY rods. I had a 1972 413MH engine with industrial heads and it had those crappy pistons. Looks like some higher than normal motorhome RPM could break those LY rods with those heavy pistons, and I mean they are heavy and very low compression.
FOUR RING piston ? .... I have heard of them ... but never seen them .... them being CRAPPY ? ... for HP use ... ferr-sure ... but for what that engine was built for ...nothing better !
The heads ? .... again ... they are PURRfect for their intended use ...LOUSY for HP ... but nothing is BESTer for a lower-RPM torque motor.
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Re: 413 Motorhome engine questions
[Re: 66coronet500]
#1412278
04/03/13 06:34 PM
04/03/13 06:34 PM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
So, I should be able to go to my local salvage yard, find a big block mopar car and grab its harmonic balancer and timing chain cover?
What should I do with the stack of MH engine parts?
Thanks to all!
As long as the BBM has a steel crank in it ....and the timing marks have not moved .... you should be good-to-go.
""""""""""Do like I did 33 years ago. Throw away everything except the block, crank and rods. A few nuts and bolts you can keep. The rest is useless. If you’ve got a mind too, I can use the truck rear sump oil pan, pickup and dipstick. """""""
For a HP set-up .... you beez uNwrong. But the bolts and nuts ? ... most of those are for the indust motor.
uSeless ? ..... send them to me ! ... I am eventually going to do some low rpm flow work on the heads to get some MPG out of these motors in MH's and tow-rigs.
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Re: 413 Motorhome engine questions
[Re: dOrk !]
#1412279
04/03/13 08:39 PM
04/03/13 08:39 PM
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Joined: Jul 2011
Posts: 817
Eugene, Oregon
Secret Chimp
super stock
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super stock
Joined: Jul 2011
Posts: 817
Eugene, Oregon
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... are you hitting the sauce or something, Doc?
1967 Dodge Coronet Deluxe station wagon
1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s
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Re: 413 Motorhome engine questions
[Re: dOrk !]
#1412280
04/03/13 09:18 PM
04/03/13 09:18 PM
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Joined: Sep 2007
Posts: 300
MA
Greg55_99
enthusiast
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enthusiast
Joined: Sep 2007
Posts: 300
MA
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Quote:
Quote:
So, I should be able to go to my local salvage yard, find a big block mopar car and grab its harmonic balancer and timing chain cover?
What should I do with the stack of MH engine parts?
Thanks to all!
As long as the BBM has a steel crank in it ....and the timing marks have not moved .... you should be good-to-go.
""""""""""Do like I did 33 years ago. Throw away everything except the block, crank and rods. A few nuts and bolts you can keep. The rest is useless. If you’ve got a mind too, I can use the truck rear sump oil pan, pickup and dipstick. """""""
For a HP set-up .... you beez uNwrong. But the bolts and nuts ? ... most of those are for the indust motor.
uSeless ? ..... send them to me ! ... I am eventually going to do some low rpm flow work on the heads to get some MPG out of these motors in MH's and tow-rigs.
Wish I had come up on you five years ago. I had 413 heads, intake, exhaust manifolds, water pump and housing, gear driven cam, the whole shooting match. I had it in storage since 1980 and got tired of looking at it. I hauled it to a dumpster one night.
Still got the 413.
Greg
Last edited by Greg55_99; 04/03/13 09:21 PM.
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Re: 413 Motorhome engine questions
[Re: Secret Chimp]
#1412281
04/04/13 03:26 AM
04/04/13 03:26 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
... are you hitting the sauce or something, Doc?
SAUCE ? .... CHIMPster ? ... 
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Re: 413 Motorhome engine questions
[Re: Greg55_99]
#1412282
04/04/13 03:45 AM
04/04/13 03:45 AM
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Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
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Quote:
Wish I had come up on you five years ago. I had 413 heads, intake, exhaust manifolds, water pump and housing, gear driven cam, the whole shooting match. I had it in storage since 1980 and got tired of looking at it. I hauled it to a dumpster one night.
Still got the 413.
Greg
CHIMPster will be really "swinging-from-da-vine" after hearing this .... 
I am going to spend about a half-a-day PORTING those exh mans !! ...... PLUS whenever I can pick-up some 413's I do .... the last time I was set-up with a swap-spot at the Nats I was told that there was a guy from MI that had FIVE of these motors... some complete some not so much. We made a deal .... and he delivered those 5 motors up to me in nw lower MI ...and he lived just west of Port Huron. .... for 350$ 
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