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73-87 Chevy _ GMC Trucks => Members Rides => Topic started by: Mudder96 on February 02, 2015, 09:04:10 pm

Title: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 02, 2015, 09:04:10 pm
Picked up this 1978 Sierra Grande on Friday for $1800!

(http://i.imgur.com/DR8wKYL.jpg)

(http://i.imgur.com/BY45IOC.jpg)

(http://i.imgur.com/7LkkyZS.jpg)

(http://i.imgur.com/FKy0wCb.jpg)

(http://i.imgur.com/aIQFcJm.jpg)

350 w/ Holley 2bbl
TH350
NP203

As of right now, the mods are:

Headers
Dual exhaust (with H pipe)
Two glasspacks and turndowns
6" Rough Country lift
Autogage 8k RPM tach
Autogage oil pressure gauge
Autogage temp gauge
American Racing wheels (AR62 Outlaw II 15x7) with 32" Regul A/T tires
Two Hella lights up front

Issues:
A 2 barrel, really? (With which I'm somehow getting about 5mpg at the moment, might I add)
Fuel gauge stuck at Full (ground?)
No radio
Sticky windows

So really just little stuff for issues!

Has seats from an unknown newer vehicle, gonna see if I can get the seats from my '95 Sierra to fit with a bracket modification.

Not really sure what my plans are for now. First thing is removing the mud flaps, adding manual locking front hubs (all time 4WD ewww), possibly do the Mile Marker transfer case mod sometime as well. Fix the little stuff and then I'm thinking of swapping a 5.3/4L60E or build the carb'd 350 and get a pro built 700R4....all in time though.

On my way home I stopped at a gas station (of course) and started talking to a guy with an El Camino. He had an Edelbrock EPS 2701 intake sitting in the back so I asked him about it and he sold it to me for $20. Says it may have a crack in a coolant passage, I'm gonna look into it but I cleaned it up and it looks nice!
Title: Re: My '78 Sierra Grande - Big Red!
Post by: LTZ C20 on February 02, 2015, 09:24:47 pm
Nice truck! Welcome to the site.
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Irish_Alley on February 02, 2015, 09:44:18 pm
welcome from maryland
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Jason S on February 02, 2015, 10:34:03 pm
Howdy and welcome from Kansas!
Title: Re: My '78 Sierra Grande - Big Red!
Post by: audrima on February 03, 2015, 12:32:08 am
Welcome from wv, vary nice truck!



Mariah
Title: Re: My '78 Sierra Grande - Big Red!
Post by: illinoisk30 on February 03, 2015, 05:03:58 am
Welcome from Northern Illinois. Nice find, good price.
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Irish_Alley on February 03, 2015, 05:08:12 am
About 5 mpgs that's not right might need a tune up but something that's not lifted and running 38s should see at least 10. The 88-98 seats are about 6" shorter than ours so 3" smaller on each side you will notice it
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Shifty on February 03, 2015, 09:47:42 am
Fine truck!  Enjoy!  8)
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 03, 2015, 04:44:05 pm
About 5 mpgs that's not right might need a tune up but something that's not lifted and running 38s should see at least 10. The 88-98 seats are about 6" shorter than ours so 3" smaller on each side you will notice it

Yeah I didn't think a two barrel would run rich enough for 5mpg. Do you think adjusting the idle screws could fix the rich issue? It idles at around 900-1000 which seems high for an old carb truck. Usually around 650 or 700 right?
Title: Re: My '78 Sierra Grande - Big Red!
Post by: zieg85 on February 03, 2015, 04:51:10 pm
Proper adjustment will help, timing is crucial as well.  A 2bbl can actually help in mpg if you have a heavy foot but the drag of big tires and the aerodynamics of a brick is all going against you...
Title: Re: My '78 Sierra Grande - Big Red!
Post by: cali6shooter on February 03, 2015, 05:50:48 pm
Hahah zieg85 that was great bricks are slick man haha my 80 c10 is having timing / mpg issues to
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 03, 2015, 09:43:20 pm
Which do you guys think would be the all around best option?

5.3, some bolt on mods, possibly something big in the future
Performabuilt 4L60E
35's on 15x12 wheels
4.11's

or

Mild build 383 Stroker (cam, springs, rockers, headers, etc.)
Built 700R4
35's on 15x12 wheels
4.11's

Also, what do you guys think of these LED headlights? I think the red would look pretty mean at night!
http://www.ebay.com/itm/331287670604?_trksid=p2055119.m1438.l2648&ssPageName=STRK%3AMEBIDX%3AIT
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Irish_Alley on February 03, 2015, 10:37:51 pm
can you do a stick? granted you lose the od and between the 4l60e and 700r4 i would go with the 4l60e just because its computer controlled and they tend to be a little tougher imo.

 my 79 with 6"+3" of lift and 38x16x16 was getting 8mpgs or so switch to 37.5x12.5x16.5 and it got 10
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 03, 2015, 11:09:00 pm
Yeah I could definitely swap it but I'd do an nv4500 if I could swap it so I can keep the overdrive
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 05, 2015, 07:20:45 pm
Well I got rid of the mud flaps, it looks way better I think!

(http://i.imgur.com/hPch12Y.jpg)

(http://i.imgur.com/2Xw4Jkl.jpg)

(http://i.imgur.com/Teaghwy.jpg)

(http://i.imgur.com/L3pwH9t.jpg)

(http://i.imgur.com/UJCJsoZ.jpg)

(http://i.imgur.com/fX9prmn.jpg)

(http://i.imgur.com/tKdVdF0.jpg)


And here's the intake I got for $20, all cleaned up now!

(http://i.imgur.com/R2qLJ4l.jpg)
Title: Re: My '78 Sierra Grande - Big Red!
Post by: LTZ C20 on February 05, 2015, 09:19:15 pm
Nice. Much better with no flaps.
Title: Re: My '78 Sierra Grande - Big Red!
Post by: enaberif on February 06, 2015, 07:52:00 am
Looked better with the mud flaps and at least they were functional. People driving around in lifted trucks without mud flaps should be beat with them. :P
Title: Re: My '78 Sierra Grande - Big Red!
Post by: LTZ C20 on February 06, 2015, 09:46:39 am
People with lifted trucks should be beaten regardless lol.  Big rims, tiny tires, useless for anything practical.

Trucks like Mudder96 here are still use full and practical. There's a big difference between lifted 4x4 and use able 4x4.
Title: Re: My '78 Sierra Grande - Big Red!
Post by: enaberif on February 06, 2015, 10:38:43 am
People with lifted trucks should be beaten regardless lol.  Big rims, tiny tires, useless for anything practical.

Trucks like Mudder96 here are still use full and practical. There's a big difference between lifted 4x4 and use able 4x4.


I'm not saying there isn't. What I'm saying is people lift up their trucks but don't take into account what it does behind them. No mud flaps equals rock and debris tossed much easier at vehicles behind them.

Be courtesy to the drivers behind you and put mud flaps on. If you don't like them get some transparent ones.
Title: Re: My '78 Sierra Grande - Big Red!
Post by: LTZ C20 on February 06, 2015, 02:43:16 pm
Yea your right. Here in CA, they take clear pieces of plexiglass and cut them down to the smallest legal size and then mount them with these big over sized brackets that are painted to match the truck. Looks ridiculous and doesn't even really work, the tires are almost always bigger than the mud flap.  You get debris tossed under and over them, there are only about the size of a 8x11 piece of paper, might as well not have any at all.
Title: Re: My '78 Sierra Grande - Big Red!
Post by: srozell on February 06, 2015, 02:55:36 pm
That's a really nice looking truck, and great price!
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 18, 2015, 03:36:10 pm
So I picked up a little something for Big Red last night... Got a 400sbc with 882 heads from a 76 K5 Blazer. I'm gonna clean it up nice and possibly build it up a little with a cam kit and maybe port and polish on the heads... Open to ideas! What size carb? 750cfm Eddy?
Title: Re: My '78 Sierra Grande - Big Red!
Post by: enaberif on February 18, 2015, 04:36:39 pm
882 heads are junk heads and not really worth doing much to. Just your run of the mill era style heads. Although if they are the heavy casting they'll be better than the light casting.

Heavy Casting:
http://s50.photobucket.com/user/ethelkilledfred/media/Parts/25b4f235.jpg.html

Light Casting:
http://images1.americanlisted.com/nlarge/sbc-882-heads-80-park-rapids-americanlisted_24991319.jpg
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Mudder96 on February 18, 2015, 05:37:11 pm
So what would be a good replacement to get? Factory or aftermarket, budget build
Title: Re: My '78 Sierra Grande - Big Red!
Post by: Engineer on February 18, 2015, 06:29:41 pm
That is not an original Minnesota truck is it?

May want to keep the mud flaps for winter driving. The mud flaps seem to delay the formation of rust because they help deflect the salt bath on the winter roads.

If there was ever a weakness to the '73~80 GM trucks it was a total lack of rust proofing.