250 Inline 6 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CanonKid · 01-19-2009, 01:29 PM

I'm rebuilding one and can't find performance parts for it. Anybody ever "hopped" one of these motors up? If so what did you do, and got any advice for me?

custom63 · 01-19-2009, 02:06 PM

Go to inliners.org
They have tons of advice.
Also look over cliffordperformance.net
They make some awesome stuff and have some good write ups about what you can do to hop things up.
Oh ya, one more thing. Get Leo Santucci Chevy Inline six-cylinder power manual. Its a great book loaded with tons of info!

Hope this helps.

ol Curt · 01-19-2009, 02:42 PM

You could also go to www.stovebolt.com or call Tom Langdon. He has some basic hotrodding stuff for the inlines and can give you a lot of info about the 250. He worked on the development of it at GM. His website is.. http://www.stoveboltengineco.com/

The aforementioned book is good. The gist of all of it is finding ways to make the 250 breathe better. There are issues with the exhaust/intake ports that can be resolved to do this, and multiple carbs are usually desirable to supply a consistent supply of fuel to all the cylinders.

kyull67 · 01-19-2009, 02:44 PM

Look at post #40 in this thread.

http://www.67-72chevytrucks.com/vboa...=313766&page=2

retodd7711 · 01-19-2009, 05:24 PM

I've read many posts in the 67-72 section of this board dealing with this.
Like posted above breathing troubles are usually addressed by carbs and headers.

Wolfinthesnow · 01-19-2009, 08:09 PM

Speedway motors has a few chevy 6banger stuff. Heres a direct link to the 6 cylinder stuff. Offenhauser intake and exhaust. Gotta let that puppy breath!!

http://www.speedwaymotors.com/Produc...inder&deptId=0
I noticed there is another book, "how to hop up chevy and gmc engines" may be the same one listed in the previous post.

ol Curt · 01-19-2009, 08:38 PM

It just depends on the level you want to hot rod it. If you want to just make a mild street machine, headers, holley 390 four barrel or three progressive 2bbls and possibly a RV cam. Some have used the pistons from a 305 and made a little more compression. If you want to make it really run strong you need to consider some lump ports for the head so the air flows over them along with polishing and porting of the head.

I had the mild version without the cam in a230, both with 2-1bbl Rochesters and the Holley. Ran good both ways, but the six won't wrap up real tight, so I used my torque up at a fairly low rpm and the valves would float a bit. The cam would have helped I believe. I ran this with duals out the back with Smithy glass packs at first , but then put on some VERY raspy chambered mufflers made for the corvettes with the exhaust under the door. My neighbors hated those!!Sorry, all i could find were the black and then chevy orange versions with the dual rochesters. I probably have the one with the holley 4bbl at work.

CanonKid · 01-19-2009, 08:44 PM

Damn those are some nice looking engines. If you can find it I would like to see the picture of the Holley 4BBL.

ol Curt · 01-19-2009, 08:49 PM

I'll look tomorrow if you promise not to tell my boss! I think the holley was in 2004, and I had a hard drive crash shortly after. I think the reason they call "backing up" your computer by that name is because you always thinkabout it in hindsight!!

I think i had those on the computer at work though.

CanonKid · 01-19-2009, 08:55 PM

No I won't tell your boss

. No worries.

ol Curt · 01-19-2009, 09:34 PM

Quote:

Originally Posted by CanonKid

Damn those are some nice looking engines. If you can find it I would like to see the picture of the Holley 4BBL.

All of that toying around with the 230 and I finally got the original motor rebuilt and put it back to factory stock(almost). It was my grandpas truck and I wanted to make it close to the way he bought it.

CanonKid · 01-19-2009, 09:52 PM

I want a 6 cylinder because I'm kinda tired of seeing smallblocks in everything, but I'd like to have a little bit more power than the stock 6.

ol Curt · 01-19-2009, 10:39 PM

I have the Leo Santucci book. Let me know if you want to borrow it.

CanonKid · 01-19-2009, 10:48 PM

Quote:

Originally Posted by ol Curt

I have the Leo Santucci book. Let me know if you want to borrow it.

Well you live kinda far away. How would you want to arrange that?

And I have a 292 in my 1966 C20.

What would be your transmission choice for a 6 cylinder be?

Oregoon · 01-19-2009, 10:43 PM

You could always consider a 292.

TwoFiftyShifter · 01-20-2009, 12:03 AM

T5 for me.

CanonKid · 01-20-2009, 12:10 AM

Quote:

Originally Posted by TwoFiftyShifter

T5 for me.

Where would I get one of those?

TwoFiftyShifter · 01-20-2009, 12:14 AM

You could probably go to the local scrapyard and look for an 80's camaro with a 5 speed and pull it..... Or find a rebuilt one for sale.

CanonKid · 01-20-2009, 12:19 AM

Hmmm I will keep my eyes open for those.

ol Curt · 01-20-2009, 04:03 PM

Here you go....
[ATTACH] Name: Carb side 230.jpg
Views: 548
Size: 50.0 KB

[/ATTACH]

CanonKid · 01-20-2009, 07:32 PM

That is a pretty sick engine also. What year of truck is that in?

*LILRED66* · 01-20-2009, 08:29 PM

Here is a link to a post about tricked out six cylinder engines:

http://67-72chevytrucks.com/vboard/s...d.php?t=276823

CanonKid · 01-20-2009, 08:37 PM

Again thank you LILRED66 for all the great info.

01-19-2009, 01:29 PM	#1
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	250 Inline 6 I'm rebuilding one and can't find performance parts for it. Anybody ever "hopped" one of these motors up? If so what did you do, and got any advice for me? __________________ 1966 C20

01-19-2009, 02:06 PM	#2
custom63 Registered User Join Date: Oct 2008 Location: Auburn, Ca. Posts: 171	Re: 250 Inline 6 Go to inliners.org They have tons of advice. Also look over cliffordperformance.net They make some awesome stuff and have some good write ups about what you can do to hop things up. Oh ya, one more thing. Get Leo Santucci Chevy Inline six-cylinder power manual. Its a great book loaded with tons of info! Hope this helps.

01-19-2009, 02:42 PM	#3
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: 250 Inline 6 You could also go to www.stovebolt.com or call Tom Langdon. He has some basic hotrodding stuff for the inlines and can give you a lot of info about the 250. He worked on the development of it at GM. His website is.. http://www.stoveboltengineco.com/ The aforementioned book is good. The gist of all of it is finding ways to make the 250 breathe better. There are issues with the exhaust/intake ports that can be resolved to do this, and multiple carbs are usually desirable to supply a consistent supply of fuel to all the cylinders. Last edited by ol Curt; 01-19-2009 at 02:42 PM.

01-19-2009, 05:24 PM	#5
retodd7711 chrome makes it go FASTER! Join Date: Feb 2007 Location: Cleveland Tennessee Posts: 2,884	Re: 250 Inline 6 I've read many posts in the 67-72 section of this board dealing with this. Like posted above breathing troubles are usually addressed by carbs and headers. __________________ She can't cook and she won't clean. But she looks good in a skirt and she brings me beer. She can stay for now. EDIT:: But she left me anyway, So forget her. 1962 GMC Stepside V6 4 speed My rolling resto thread http://67-72chevytrucks.com/vboard/s...d.php?t=324226 My old farm truck http://67-72chevytrucks.com/vboard/s...=1#post3465005

01-19-2009, 08:09 PM	#6
Wolfinthesnow Registered User Join Date: Feb 2008 Location: Plant City, Fl Posts: 174	Re: 250 Inline 6 Speedway motors has a few chevy 6banger stuff. Heres a direct link to the 6 cylinder stuff. Offenhauser intake and exhaust. Gotta let that puppy breath!!http://www.speedwaymotors.com/Produc...inder&deptId=0 I noticed there is another book, "how to hop up chevy and gmc engines" may be the same one listed in the previous post. __________________ I dont care how you did it in California!!!

01-19-2009, 02:44 PM	#4
kyull67 Registered User Join Date: Nov 2006 Location: Springfield/Kansas City Posts: 1,842	Re: 250 Inline 6 Look at post #40 in this thread. http://www.67-72chevytrucks.com/vboa...=313766&page=2 __________________ The first '67 The current '67 '63 Biscayne

01-19-2009, 08:38 PM	#7
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: 250 Inline 6 It just depends on the level you want to hot rod it. If you want to just make a mild street machine, headers, holley 390 four barrel or three progressive 2bbls and possibly a RV cam. Some have used the pistons from a 305 and made a little more compression. If you want to make it really run strong you need to consider some lump ports for the head so the air flows over them along with polishing and porting of the head. I had the mild version without the cam in a230, both with 2-1bbl Rochesters and the Holley. Ran good both ways, but the six won't wrap up real tight, so I used my torque up at a fairly low rpm and the valves would float a bit. The cam would have helped I believe. I ran this with duals out the back with Smithy glass packs at first , but then put on some VERY raspy chambered mufflers made for the corvettes with the exhaust under the door. My neighbors hated those!!Sorry, all i could find were the black and then chevy orange versions with the dual rochesters. I probably have the one with the holley 4bbl at work. Attached Images

01-19-2009, 08:44 PM	#8
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	Re: 250 Inline 6 Damn those are some nice looking engines. If you can find it I would like to see the picture of the Holley 4BBL. __________________ 1966 C20

01-19-2009, 08:49 PM	#9
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: 250 Inline 6 I'll look tomorrow if you promise not to tell my boss! I think the holley was in 2004, and I had a hard drive crash shortly after. I think the reason they call "backing up" your computer by that name is because you always thinkabout it in hindsight!! I think i had those on the computer at work though.

01-19-2009, 08:55 PM	#10
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	Re: 250 Inline 6 No I won't tell your boss . No worries. __________________ 1966 C20

01-19-2009, 09:52 PM	#12
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	Re: 250 Inline 6 I want a 6 cylinder because I'm kinda tired of seeing smallblocks in everything, but I'd like to have a little bit more power than the stock 6. __________________ 1966 C20

01-19-2009, 10:39 PM	#13
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: 250 Inline 6 I have the Leo Santucci book. Let me know if you want to borrow it.

01-19-2009, 10:43 PM	#15
Oregoon Roadside Rebuilder Join Date: Oct 2008 Location: Southeast Portland, OR Posts: 421	Re: 250 Inline 6 You could always consider a 292.

01-20-2009, 12:03 AM	#16
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: 250 Inline 6 T5 for me. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!

01-20-2009, 12:14 AM	#18
TwoFiftyShifter Registered User Join Date: Nov 2008 Location: Gwinnett GA Posts: 1,803	Re: 250 Inline 6 You could probably go to the local scrapyard and look for an 80's camaro with a 5 speed and pull it..... Or find a rebuilt one for sale. __________________ 1982 K10 SWB 1987 V20 - Sold - Doh!



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01-20-2009, 12:19 AM	#19
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	Re: 250 Inline 6 Hmmm I will keep my eyes open for those. __________________ 1966 C20

01-20-2009, 04:03 PM	#20
ol Curt Junior Member Join Date: Dec 2006 Location: Newburgh, IN Posts: 1,247	Re: 250 Inline 6 Here you go.... [ATTACH][/ATTACH] Attached Images

01-20-2009, 07:32 PM	#21
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	Re: 250 Inline 6 That is a pretty sick engine also. What year of truck is that in? __________________ 1966 C20

01-20-2009, 08:29 PM	#22
LILRED66 Account Suspended Join Date: May 2005 Location: Kansas City, KS Posts: 3,906	Re: 250 Inline 6 Here is a link to a post about tricked out six cylinder engines: http://67-72chevytrucks.com/vboard/s...d.php?t=276823

01-20-2009, 08:37 PM	#23
CanonKid Registered User Join Date: Jan 2009 Location: Tucson, Arizona Posts: 84	Re: 250 Inline 6 Again thank you LILRED66 for all the great info. __________________ 1966 C20

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