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#779688 - Sat Sep 10 2011 11:10 PM Chevy 250 Straight 6 and transmission info?  
AzMcCoy  Offline
Wrench Fetcher
Joined: Aug 2011
Posts: 55
My 64 C10 has a 1972 car 250 straight 6 in it. Was thinking about pulling it and stuffing a 350 in there for a new power plant but have decided to keep the 250 IF:

I can add factory air power steering Alternator automatic transmission w an overdrive, floor shift and get some performance out of it.

I want it to be an every day driver and need the ability to cruise 65.

So i'm asking for guidance here gentlemen....

What do I need to find to build the motor I have into what I want it to be?

And can I get all that pretty chrome that the grown ups have on their motors?

#779718 - Sun Sep 11 2011 02:18 AM Re: Chevy 250 Straight 6 and transmission info? [Re: AzMcCoy]  
Joe H  Offline
Shop Shark
Joined: Feb 2000
Posts: 4,047
Lee's Summit Mo. 64086
Factory air if you can find brackets to hold the compressor, I am betting they are rare. Same for the power steering, they come up on e-bay every now and again.

Automatic with overdrive, 200R4 or 700R4 will bolt right up, will it have enough power to pull it in overdrive? maybe, maybe not, depends on the weight of the truck and how hard you wish to push it. My '37 weighs in at 3300 with me and runs 70 mph all day long at 2300 rpm. Not sure it would do that with overdrive, it doesn't have much torque below 2000 rpm (stock 250 with two one barrel carbs). Fuel milage in the 15 to 17 range depending on the wind and speeds I drive.

Floor shift, sure Lokar sells quite a few of them and they are nice, easy to set up and install, and work great.

Chrome is out there buts its all cheap import stuff and hard to seal. I switched back to stock parts, got tired of the leaks.

Performance parts, some but not like a small block, cams mostly. A easy up grade is 307 V8 true flat top piston, direct bolt in and will raise the compression about 1 point, some where in the 9.0 to 1 range. All 230, 250, 292 heads are the same with very slight differences in compression, nothing to shop for. The early 194 head will raise the compression more, but the ports are terrible and require some work just to work as good as a stock later head. Jump over to www. for more performance questions and links to high performance parts.


#779719 - Sun Sep 11 2011 02:24 AM Re: Chevy 250 Straight 6 and transmission info? [Re: AzMcCoy]  
LGriffin  Offline
Shop Shark
Joined: Nov 2002
Posts: 1,081
Oakdale, CA
I'll try and answer a few of your ifs'.

Power steering, look for any 194/230/250 in the wrecking yard with power steering. You want all the pulleys, brackets, and pump. You do not want anything from an integral (intake manifold is part of head) head six or a 292 six. I've got a bin full power steering brackets that are not complete sets.

Alternator?? you should have one now.

Automatic with overdrive, I'm not much on automatics, but you should be able to get away with a 200R4 or 700R4 depending on how many horses your daily driver is going to have. Floor shift your choice. You will need a cross member to mount the reart of the tranny and a bracket on the carb throttle shaft to hook the cable from the tranny to.

250 performance how much? Sixes are not cheap to build especially the more ponies you want. The good news is that a 307 v8 piston will swap with the 250 and up your compression. Since the 307 was not a popular motor there are some forged 307 piston from the likes of TRW still floating around, saves a bunch over custom. I suggest you do a search on I couldn't find the post but tlowe did a series of dyno runs on the 250 with an assortment of carbs, cams, and head work between 3/16/10 - 4/5/10.

That's a start.


I don't own a vehicle that isn't old enough to drink.

#780120 - Mon Sep 12 2011 02:59 PM Re: Chevy 250 Straight 6 and transmission info? [Re: LGriffin]  
starfire4  Offline
Shop Shark
Joined: Dec 2008
Posts: 319
White Cloud, MI, USA
I'm running a stock (.030 over) 250 with a 4-speed from a '74 Nova in my '65. With the 3.73 rear end, it pulls up great empty, and can handle my flatbed trailer at normal speeds. I sometimes wish for an overdrive gear, but I think the 250 was designed to operate at a few more rpms than the older 6's.
And, I get about 20 mpg, if I keep my foot out of it!


If you can't fix it with a hammer and screwdriver, you need a bigger hammer.
1965 Chevy C10

#783088 - Fri Sep 23 2011 02:05 PM Re: Chevy 250 Straight 6 and transmission info? [Re: starfire4]  
AzMcCoy  Offline
Wrench Fetcher
Joined: Aug 2011
Posts: 55
Thanks guys, food for thought.

I keep waffling back and forth between installing a small block or building the 6....leaning to building the 6 since it is already in the truck.

Just need to slap some headers, maybe dual carbs, power steering, air conditioning, power brakes and steering and a few other odds and ends on there and I'll be fine.

At least until I change my mind.

#783106 - Fri Sep 23 2011 03:03 PM Re: Chevy 250 Straight 6 and transmission info? [Re: AzMcCoy]  
don stocker  Offline
Shop Shark
Joined: Nov 2006
Posts: 2,693
osceola, wi
If your looking to add A/C, P/S and an automatic overdrive transmission to a 250 I6 you are going to be disappointed. If your looking for modern day performance then the 350 is your best bet. A inliner can be made to keep up but it takes some serious $$$ and work. Just an opinion. Good Luck either way.

Moderated by  53moneypit, Woogeroo 

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