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Tractor Talk Discussion Forum

Hey 2x4.... 366 or 427

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Andrew from KY

02-21-2006 18:28:34




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Yes the starters and other components are interchangeable. I'm not certain on the intakes, you'd have to check a manual. As for interstate speed, you have to look at your tranny and the rear axle. Just a stab in the dark here but does it have a 5+2 and a 6.50 rear end?




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2x4

02-21-2006 19:23:21




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 Re: Hey 2x4.... 366 or 427 in reply to Andrew from KY, 02-21-2006 18:28:34  
Yes, 5 forward speeds+2 speed. Dont know about rearend yet. Must say on a tag somewhere. Relieved that the componets fit, thanks.



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Andrew from KY

02-21-2006 19:35:28




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 Re: Hey 2x4.... 366 or 427 in reply to 2x4, 02-21-2006 19:23:21  
Okay I know that on the older trucks (73-88) that GM placed an build sheet on the inside of the glovebox door. It showed what is called an RPO code on the left side of the column and to the right of the code would be a description. For example my 87 Chevy pickup has one code of K34: shich means cruise control, or D45: which means stainless steel outside mirrors. I know that on the newer body style pickups (88+) the build sheet only shows the codes, and I can't remember if the sheet is located in the glovebox or not. I have an 88 Chevy also, I'll go check and see where it is first thing in the morning, they are probably in the same place for both the pickups and 2-tons. If you find that then we might be able to decode the list to find the rear end ratio.

By the way, about what was the max speed for the truck? We have a '78 C65 with the 427 and a 6.50 rear end, it's governed at 3800 rpms and it maxes out screaming around 68-70.

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2x4

02-21-2006 23:58:40




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 Re: Hey 2x4.... 366 or 427 in reply to Andrew from KY, 02-21-2006 19:35:28  
I'll look also when the rain stops. The old engines runs about 3300 rpms. Top speed is 40 mph downhill, unless there's a headwind. It acts like it has a governor on it. Probably the hole in the piston ( I think thats the trouble. It crippled in 600 miles. Thought I'd never get home.)



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Hugh MacKay

02-22-2006 15:10:11




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 Re: Hey 2x4.... 366 or 427 in reply to 2x4, 02-21-2006 23:58:40  
2x4: Just happened to notice this, in pre 1980 trucks that rear end ratio was spelled right our on that sticker in the glove box, then somewhere around 80 they went to code. My 86 - 20 series had a flat metal tag inside the rear end under the one of the bolt heads holding the carrier bearings in place. I forget all the info on that but ratio was one item. I know a shop was able to order parts for rebuild once he got that tag. So it probably gave part numbers for a matched crown and pinion, as well as carrier and pinion bearings.

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Andrew from KY

02-22-2006 08:40:32




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 Re: Hey 2x4.... 366 or 427 in reply to 2x4, 02-21-2006 23:58:40  
The code sheet in my pickup is inside the glovebox, but it only lists the codes. There are places on the internet that have listings of the codes and their meanings, but I don't know if there are any out there for medium duty trucks. If you take the list to a dealer they can probably tell you what everything means. 40 mph, that is SLOW, are you sure that the two-speed is working properly? I know sometimes they will hang up in one range and not shift into the other. Even the lowest geared ones that I've been around would do 55. The farm I work on has a GMC Topkick with a set of insanely low gears, does 60 at 3500 rpms with a 3208 Cat. I think the gears in it are something like 7.14 maybe?

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Mark - IN.

02-21-2006 19:02:08




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 Re: Hey 2x4.... 366 or 427 in reply to Andrew from KY, 02-21-2006 18:28:34  
The intake manifolds on the 366 and 427 "truck" blocks can be interchanged. They can"t be used on the 396, 402, 427, and 454 passenger car/truck block because they are wider, because of the taller cylinder deck heighth of the "truck" block. One can use an intake manifold from the passenger car/truck block if spacers are used between the intake manifold and cylinder heads. Everything else is interchangeable between themselves and the passenger car/truck block, including cranks, the exception being the pistons. The truck pistons are taller because another set of rings are used (hence the .4" taller block), so won"t fit in the passenger car/truck block without either shortening the stroke, rods, or a combination of them. You could use the shorter passenger car/truck piston in the truck block, but without either going with a longer stroke, rods, or combination of, the compression ratio will drop off significantly. Those are the exceptions. Everything else is green light.

Mark

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2x4

02-21-2006 19:25:43




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 Re: Hey 2x4.... 366 or 427 in reply to Mark - IN., 02-21-2006 19:02:08  
fantastic. Everything I needed to know. thanks.



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