09-18-2016, 08:32 PM | #1 |
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1980 c10 383 help
So I'm taking a break on my 69 short wide body off resto to play with the 1980 c10 short wide I picked up a month ago. The truck is in amazing condition but has the anemic 305. I have the 460hp 383 I built for my 69 sitting on the engine stand and plan on swapping it into my new 1980.
First question is will all of the accessorie drives from the 305 bolt up to the 350 block? The truck has factory ac and I don't won't to loose it. Second question is are the engine mount locations in the same spot? I have the red prothane mounts that I was going to use in my 69 and I was hoping that they would work. Third question is can someone confirm my gear ratio. From the research I have done I'm thinking 273 gears. I have the original window sticker and it just says standard ratio. (12 bolt) Last question is could someone chime in with torque converter stall speed recommendations. It's a single cab short bed, 460hp 383 with rpm air gap and 750 Holley dp. The truck is a auto th350. I would like to keep the 273 gears if possible just for highway cruising. All the research I did only pulls up converter stall speeds for camaros with 273s Thank you Pics of the truck for fun Posted via Mobile Device |
09-18-2016, 11:45 PM | #2 |
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Re: 1980 c10 383 help
I've had 2 1980 trucks, one had 3.08, and one had 3.42. With that kind of hp you should change all your fluids, and give everything a good once over, then you will see what gears you have. The torque converter depends on what cam you have, your cam card should tell you what you need to know. Everything from the 305 will bolt up, and your red mounts should work fine.
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09-19-2016, 08:48 AM | #3 |
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Re: 1980 c10 383 help
My understanding was all the 305/350 accessories were interchangeable. You might want to confirm what your rear gears actually are. Heres a quick and easy way. https://www.youtube.com/watch?v=kGkwb76tkDw
Sounds like you might have 3.73 gears, they never made a 2.73 ratio. A 14 bolt with 10.5" ring gear came with 3.21, 3.42, 3.73, 4.10, 4.56, 4.88, 5.13, and 5.38 ratios.
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'84 K10, SM465, NP208, 3.42 Gears, 33x12.5-15 GM 4 bolt 880 roller block, 062 Vortec Heads Comp Cams XR258HR-10, MSD Street Fighter HEI Edelbrock: Performer Intake 2116, 1405 Carb Long tube headers, 2.5" duals to Flow Master Super 40's Vortec Engine Build |
09-19-2016, 02:52 PM | #4 |
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Re: 1980 c10 383 help
Hi There..... yes they did make a 2:73 ratio 12 bolt..... I have a 81' 4 x 4 with factory 12 bolt 2:73. Works great.
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09-19-2016, 03:42 PM | #5 | |
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Re: 1980 c10 383 help
Quote:
Edit: Looks like that ratio was offered in '81 in the semifloat 14 bolts. http://brochures.slosh.com/1981/pickups20.jpg
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'84 K10, SM465, NP208, 3.42 Gears, 33x12.5-15 GM 4 bolt 880 roller block, 062 Vortec Heads Comp Cams XR258HR-10, MSD Street Fighter HEI Edelbrock: Performer Intake 2116, 1405 Carb Long tube headers, 2.5" duals to Flow Master Super 40's Vortec Engine Build Last edited by Marshy; 09-19-2016 at 04:00 PM. |
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09-19-2016, 04:42 PM | #6 |
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Re: 1980 c10 383 help
The guy has a 12 bolt, not a 14 bolt.
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09-19-2016, 09:28 PM | #7 |
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Re: 1980 c10 383 help
I will have to pull the diff cover to confirm the gears.
Here is my cam card. Hopefully someone can chime in with this info added to the thread.
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09-19-2016, 10:46 PM | #8 |
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Re: 1980 c10 383 help
The rpm range for that cam is 2800 to 7000. I would use a 2500 rpm stall.
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09-19-2016, 10:59 PM | #9 |
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Re: 1980 c10 383 help
^^^^i was thinking 2600-2800
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09-20-2016, 12:40 AM | #10 |
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Re: 1980 c10 383 help
I'm sure a 2800 would be ideal, it seems that 2500 stall converters are pretty common, and cheap. I dont think that I would be able to tell the 300 rpm difference.
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09-20-2016, 12:27 PM | #11 | |
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Re: 1980 c10 383 help
Quote:
RPM Range is 2800-7000 http://www.compcams.com/Company/CC/c...x?csid=89&sb=2 Here is the dyno sheet for that cam. http://www.compcams.com/Technical/Dy...94H-10_001.asp Thanks for pointing that out, my brain didn't process it properly when I read it I guess lol.
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'84 K10, SM465, NP208, 3.42 Gears, 33x12.5-15 GM 4 bolt 880 roller block, 062 Vortec Heads Comp Cams XR258HR-10, MSD Street Fighter HEI Edelbrock: Performer Intake 2116, 1405 Carb Long tube headers, 2.5" duals to Flow Master Super 40's Vortec Engine Build |
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09-20-2016, 06:02 PM | #12 |
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Re: 1980 c10 383 help
Yes it's a 79 block high tin/high nickel 4 bolt main. I read the description when I picked the cam. I was originally building my 1969 as a street strip truck. I was just hoping that I would be able to get by with a 273 gear ratio. I still have not confirmed my gears yet. Going to try to do that this weekend.
In your opinion how much is it going to hurt that cam running a air gap over a Vic jr?
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