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Old 09-01-2015, 09:15 AM   #29
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1982 31' Airstream 310
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Progress has been slow this week. Stripped parts from the 454 and got most of them on the 502. Quadrajet does not fit. Waiting for parts to finish swapping over. I'm hoping everything comes soon so I can get the motor in this weekend. Click image for larger version

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1982 310 motorhome 454
Henniker New Hampshire
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Old 09-01-2015, 12:23 PM   #30
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Progress has been slow this week. Stripped parts from the 454 and got most of them on the 502. Quadrajet does not fit. Waiting for parts to finish swapping over. I'm hoping everything comes soon so I can get the motor in this weekend. Attachment 246984


1982 310 motorhome 454
Henniker New Hampshire
That's interesting about the quadrajet. What is the fitment issue? You might look into using an Edelbrock carburetor. I plan on running an Edelbrock 1406 600 SCFM caruburetor. With a 502 you'd likely need a slightly larger one!

Brad
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Old 09-02-2015, 12:54 PM   #31
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That's interesting about the quadrajet. What is the fitment issue? You might look into using an Edelbrock carburetor. I plan on running an Edelbrock 1406 600 SCFM caruburetor. With a 502 you'd likely need a slightly larger one!

Brad
The Quadrajet bolt pattern is too narrow for the GM supplied intake. GM recommends a Holley 850 for this motor, so that's what I got. Should be painful at the pumps! (not that it wasn't before). I would love to have gone with fuel injection but this project has run up against financial reality.

Keith
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Old 09-02-2015, 01:31 PM   #32
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Despite all the hassle and financial set backs you went through, I share your excitement about having a new Motor. It will be well worth it !!
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Old 09-02-2015, 02:55 PM   #33
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The Quadrajet bolt pattern is too narrow for the GM supplied intake. GM recommends a Holley 850 for this motor, so that's what I got. Should be painful at the pumps! (not that it wasn't before). I would love to have gone with fuel injection but this project has run up against financial reality.



Keith

A properly tuned carb will be pretty close an EFI system. Especially some of the aftermarket stuff. Maybe even better.
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Old 09-02-2015, 04:02 PM   #34
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I think that new engine could be better on fuel you won't have to smash the right foot to the floor to get the MO moving. And going down the road it should sound Bad Azz.
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Old 09-02-2015, 04:46 PM   #35
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I think that new engine could be better on fuel you won't have to smash the right foot to the floor to get the MO moving. And going down the road it should sound Bad Azz.
There is some truth to your reasoning, as I remember in the early 90's my girlfriends parents at the time were looking to buy her a car, a Ford Taurus with 4 cylinder. Just out of curiosity I remember asking the salesman what the difference was in MPG between the 2.3L four and the 3.8 six was. The four got 1mpg better in the city but the six got 3 better mpg on the highway.

However apples to oranges, an 850 double pumper on a 502 punching a 8.5' x 10.6' 15,000 lb hole in the atmosphere is going to cost you a lot more than the 650 double pumper 340 in my 69 Dart GTS convertible that I use to own. Yes it sounded Bad Azz too.

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Old 09-05-2015, 07:47 PM   #36
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Preparing to install the 502.
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Tight fit!
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1982 310 motorhome 454
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Old 09-05-2015, 07:54 PM   #37
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Can't wait to hear how it runs; maybe born of out necessity but that is a serious performance improvement.
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Old 09-05-2015, 10:47 PM   #38
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Really dumb question ...
why not a diesel?
7.3/7.4 or 8.2?
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Old 09-05-2015, 11:50 PM   #39
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I think it would be a lot more work. And you need to change the rear end gear ratio and the list goes on. You would need to keep it a long time for the diesel swap to pay off. I can see doing it but would I do it I hope not.
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Old 09-06-2015, 03:18 AM   #40
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Beautiful!!! Is that the first 502 anybody has heard of being installed in a classic? Wish you the best of luck through the rest of the install!!

Mike
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Old 09-06-2015, 05:10 AM   #41
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Really dumb question ...
why not a diesel?
7.3/7.4 or 8.2?
I looked into a diesel replacement. The motors were really expensive, even with high mileage used motors. It would have dramatically increased the time required for the swap to custom fit everything. I would need to add a second fuel tank or switch the generator over to propane. As Hans said, I would have probably needed to change the rear end gearing to get into the correct RPM range for a diesel. I felt it was too much work, too expensive and would keep me away from enjoying camping trips for too long to justify the gains in fuel economy and torque. This was a big enough project with a direct bolt in replacement!
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Old 09-06-2015, 06:37 AM   #42
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Edelbrock 650

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I think the Quadrajet is not going to give you the fuel needed as it is.
Your going from what was it 280 hp to 450. You may know all this.
Keep a eye on the plug color. It's going to be a fun MO to drive.
I'm running an Edelbrock 650 cfm on a 327 cui and it makes my pickup truck scream. It might be a tab bit to much but for the cam, heads, and intake combo it works well. The new aluminum heads greatly reduced the weight from the cast iron heads. IHMO, I'd stick with the stock exhaust manifolds. Less chance of warping and having to replace manifold exhaust gaskets.
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