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84 G10 250
#628293 July 27th 2013 3:59 pm
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Hey.
I have a 250 that I'm just trying to make better all around without spending to much. Increased performance would be great but I'm not trying to win races. Increased economy would be good. It will be an everyday, multipurpose van, I guess.

I was thinking of putting headers and a single side pipe (2's great for v8 but personally think it's to much on a 6), unless someone with knowledge could advise against. Want it to sound throaty but not obnoxious. I also want to take off the original air box and fit a better looking k&n pan style but not sure what to do with all the pipes feeding back into it?

Any recommendations worth the money would be appreciated, distributors etc.

Thanks

Re: 84 G10 250
Blackdaze #628294 July 27th 2013 4:18 pm
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MSD ignitions do help MPG's but not a lot. Header and exhaust will help if you can keep your foot out of it. How hard is it to bolt a 700R4 onto the inline? That would be worth 3-4 MPG. A cam would help some. Cam technology has improved some in the last 30 years. Not to mention the 80's cams were horrible. The big three were more concerned with blowing clean than making an efficient truck engine.


When Chris Farley talked about living in a van down by the river, did anybody else think that wasn't such a bad idea?
Re: 84 G10 250
Blackdaze #628295 July 27th 2013 4:50 pm
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Thanks. transmission change isn't an option right now but certainly will be in future with that much difference.any suggestions on what and where to get a cam?

Re: 84 G10 250
Blackdaze #628304 July 27th 2013 6:11 pm
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When Chris Farley talked about living in a van down by the river, did anybody else think that wasn't such a bad idea?
Re: 84 G10 250
Blackdaze #628316 July 27th 2013 8:45 pm
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1984 G30 Chevy
Re: 84 G10 250
Blackdaze #628348 July 28th 2013 1:20 am
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Look into performance options for the older GM inline sixes from the fifties.[Linked Image]


An open road,full tank of gas,and a good selection of music,me and my Chevy van
Re: 84 G10 250
Blackdaze #628350 July 28th 2013 3:25 am
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As simple as it gets....COoL


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Re: 84 G10 250
Blackdaze #628471 July 28th 2013 7:35 pm
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And, a 700R4 will bolt up to the 250 without an issue, but you'll need some sort of computer to run it as the 700R doesn't use a kickdown or vacuum to make it shift up or down. You'll also need to adapt the carb for the TV cable.


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Re: 84 G10 250
Blackdaze #631436 August 14th 2013 10:01 pm
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finally got around to doing a bit of work on it and have found that he head has the manifold cast into it!?! WTF! this is something very new to me. can anyone tell me about it/options i have?
thanks

Re: 84 G10 250
Blackdaze #631648 August 15th 2013 10:27 pm
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Manifolds on a 250 bolt on like every other engine. See the picture above.


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Re: 84 G10 250
Blackdaze #631687 August 16th 2013 2:44 am
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There are 2 different heads for that 250 6 cyl,one is the head and intake manifold are cast as one unit and exhaust manifold bolts around it and I believe they call it an integral head and then there is one that looks like the picture above with the intake and exhaust bolt on separately, I found this out when I replaced my 1981 motor,on your motor you are somewhat limited as far as performance upgrade other than a better carb or different type of spark plugs, wires and maybe some type of better HEI ignition system,better dist.cap(brass studs) and so on. cheers


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Re: 84 G10 250
Blackdaze #632522 August 21st 2013 4:41 pm
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Thanks Greywolf, appreciate that. I'm going to replace the head. I'm not looking for major performance by any means but I cant even replace the air cleaner on this thing without changing the carb! Want to get rid of all the excess like the smog air injection system too.

Re: 84 G10 250
Blackdaze #634993 September 10th 2013 7:04 pm
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New one on me, but I've mostly pulled straight 6s to get them out of the way.


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Re: 84 G10 250
Ripper #635018 September 10th 2013 9:43 pm
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I know exactly what you want to do: get just a little more power out of the old, tired six to make it not so miserable to drive. You grow tired of not being to hold 60mph up a hill. It is a little embarrassing. I had the same problem with my 1992 G20 shorty with a 4.3L six. Sixes in full sized vans are marginal when they are new and as they age they are not good if you live in mountain country. I looked at all the options, read the forums, etc. I realized that that any money invested into the six would be for little improvement in power or mileage. I ended up buying a 2001 Express 3500 with a 350 and a 4l80E that was rolled for $1300. I switched the engine, tranny, complete wiring harness, steering column, fuel pump, driveshaft yoke, instrument cluster, etc. I had about $300 dollars in extras to replace fuel lines, etc. I now have a way more powerful vehicle, get a little better mileage, and it sounds awesome with just cats out the sides.
However, it was a big undertaking. It took 3 months to rip both trucks apart and build custom engine and transmission mounts, figure out wiring with factory service manuals for both vehicles, and modify almost every vehicle system. I know more about my van than I ever wanted to know.
Probably your best bet would be to limp around in the stock six till you can afford an eight. But I know how time and financial constraints would make an alternative seem very attractive.



1992 Chevy G20, 110" wheelbase, Mark III conversion, L31/4L80e swap, Express wiring harness.
Re: 84 G10 250
Blackdaze #760120 May 02nd 2020 2:53 pm
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Very belated thank you HonestRansy.
Finally getting around to working on this and bought a c10 with a crate v8 to do a swap. The 6 is just too much money for no real point.
Unfortunately starting to like the C10 so looking for another donor. Probably going LM7 route.

Re: 84 G10 250
Blackdaze #760121 May 02nd 2020 3:19 pm
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LS swap!


1987 B250 - Painkiller
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