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#1 |
Registered User
Join Date: Sep 2003
Location: Commerce Texas
Posts: 36
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Just wondering what would you gain by a 3/2 setup on a 250 6 cyl. (1970)Where would you find one and what kind of performance would it have. Just about decided to keep my 6 and not try the 350 swap. Just curious. Looked in the latest summit catalog and didnt see one. I did see one at the latest swap meet in East Texas but didnt ask questions. Thanks Ben
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#2 |
village idiot
Join Date: Oct 2006
Location: Barbourville,KY
Posts: 178
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Re: 3/2 setup on a 250
it's definatly not easy to find I6 speed parts....
try www.stoveboltengineco.com and www.inliners.org these are the best sites for inline 6 information.I plan on dropping a 292 in my gmc,good luck with your build. |
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#3 |
Registered User
Join Date: Nov 2000
Location: Carver County, Minnesota, USA
Posts: 626
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Re: 3/2 setup on a 250
Try here: http://www.cliffordperformance.net/
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72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71... |
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#4 |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: 3/2 setup on a 250
Three deuces is a lot of carb for the street. You'll need a lot more cam, headers and a good port job on the head. Before you do anything I would recommend getting a copy of Santucci's power manual. He goes into a lot of good details on the 250. Another good source is Tom Langdon at Stovebolt Engine. Call him and be ready, he can tell you a lot. Very opinionated, but there's always good reasoning behind his opinions.
One problem with the 3x2 setup is firewall clearance. I've never seen one on this series, so I'm not sure what is needed.
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#5 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,267
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Re: 3/2 setup on a 250
Here is a truck listed on ebay with a 3 carb setup. http://cgi.ebay.com/ebaymotors/ws/eB...7109305&rd=1,1
All it says is it's an Offenhauser set up. It looks to me like the front and rear carbs are not hooked up. No gas line going to them. Not sure about the linkage. I'll bet if you do some net surfing for 6 cylinder engine parts suppliers you'll come up with a number of options. One of our members ( I believe it is N2Billet ) just over the past year built up a 67 or 68 with the 6 cyl and painted it up and added some billet parts to make the stock engine look great. Single carb though.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross Last edited by Boog; 12-17-2006 at 08:35 AM. |
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#6 |
Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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Re: 3/2 setup on a 250
I don't think that they make a 3x2 intake for 194-292 applications. Offy still makes a 3x1 set up for 3 1bbls. It might be kinda hard to set up for street though. You would probably be better off with a single 4bbl
Offy Part Number 5414 = 3x1 Intake Check out inliners.org - lots of good information over there for inliners
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-'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered ![]() ![]() ![]() Last edited by arkracing; 12-17-2006 at 09:11 AM. |
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#7 |
Registered User
Join Date: Sep 2003
Location: Commerce Texas
Posts: 36
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Thanks for all the input. Will probably go with the 350 swap. Sounds easier.
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#8 |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: 3/2 setup on a 250
Why not drop a 4 brl and headers on the inliner? Did that on my last project and I am very happy with it. Not to mention its different............Pop the hood and alot of people ask, "I never seen that before"
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'72 K-20 EFI'ed 250 Inline/4spd stake body, Farm Truck '71 C-20 Cummins Diesel Powered, In storage thanks to $5.00 diesel! '69 3500 GMC 305V-6/4spd, Still under reconstruction.......... Inlines Rule! 6 soldiers standing is better than 8 laying down!!!!!!!! |
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#9 | |
Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: 3/2 setup on a 250
Quote:
Here are a couple of 250's. One in a 37 pickup with a 3x2 sidedraft setup. The other is a 63 Nova with a pair of Holley quads. Both setups available from Clifford.
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Fred There is no such thing as too much cam...just not enough engine. ![]() |
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#10 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: 3/2 setup on a 250
Another cool option I have seen is the 6 in the 50 "burb belonging to the pres or one of the officers of the "Georgia Street Rod Association".It regularly tows a trailer to all kinds of street rod functions and carries AC and passengers in comfort.It has a single 4 BBL on an old Offy(I Believe) It must work well although I think he has to change blower belts ocassionally.I had pics til my last comp crashed. I think it's a mini blower like an underdriven 144.The truck is a nice cruiser but not show quality.Maybe one of the BB members knows the truck and can post a pic.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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