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10-18-2013, 02:25 PM
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#1 |
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"Junkyard Dog"
 
Join Date: Jan 2008
Location: Springfield Oregon
Posts: 2,527
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Anybody built up a 250 L6 engine?
I'm looking into building a 250 L6 engine for a 63 Nova. I'm considering a highly modified OEM head, roller cam, roller rockers, Scat "H" beam rods, custom forged pistons, 4 barrel intake, header, HEI, about 11:1 comp, and all the goodys to make it come together. Also thinking about a centrifical super charger with a blow through carb. Anybody have any experience with this kind of build? Thanks, Tom
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72 C-10 Cheyenne Super LWB, Vortec 427,TH700, 3.73 posi, tach, tilt, AM-FM,Frame off in process. http://s289.photobucket.com/albums/l...t=7eae161e.pbw 88 Monte Carlo SS bought new only 10k miles. 73 Chevelle SS 454 had since high school. 74 Camaro Z28 350 AT numbers matching, Black on Black. 73 El Camino SS 350 4sp. 70 Chevelle SS 396 4sp, number matching with LS6 454 69 Chevy C30 Car Hauler 86 K20 383 4sp 4" lift frame off restoration. http://s289.photobucket.com/albums/l...t=1b1082d3.pbw |
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10-18-2013, 04:14 PM
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#2 |
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Registered User
Join Date: Jul 2010
Location: Willingboro, NJ
Posts: 489
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Re: Anybody built up a 250 L6 engine?
Suttons speed shop in Pemberton, NJ. The owner there does neat stuff to inline sixes.
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Retired USAF - No rockets, no mortars, no bad guys shooting...No stress!!!  My Build Thread: Project 72' Green http://67-72chevytrucks.com/vboard/s...d.php?t=587932 |
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10-18-2013, 05:15 PM
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#3 |
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Registered User
Join Date: Dec 2012
Location: Virginia
Posts: 233
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Re: Anybody built up a 250 L6 engine?
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10-18-2013, 09:48 PM
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#4 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,213
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Re: Anybody built up a 250 L6 engine?
We had a fairly hot 250 cu in L6 in our '69 GMC stepper when new.
.060 over on the bore, 12.5:1 compression, full dual exhaust using a dual outlet manifold, homemade tripower intake with three Rochester 2G carbs and a Pontiac progressive linkage. The cylinder head was reworked by removing the bosses in the intake ports that the bolts pass through. Retention was maintained using cap screws countersunk in the floor of the port; the top of the port was plugged (or, for more clandestine activities, closed off with a simulated head bolt). 3.73 rear axle with a 3.11 low gear Saginaw floor shifted 4 speed trans. Ran well enough to stay ahead of the local V8 trucks; at least on short jaunts on city streets. K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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10-19-2013, 12:22 AM
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#5 |
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Registered User
Join Date: Apr 2011
Location: Mustang, Oklahoma
Posts: 2,806
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Re: Anybody built up a 250 L6 engine?
Have a look at "project turbo 250" I think he made around 330 HP on the dyno.
http://67-72chevytrucks.com/vboard/s...d.php?t=485843
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Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car |
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10-19-2013, 01:10 AM
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#6 |
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Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,448
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Re: Anybody built up a 250 L6 engine?
Check out www.inliners.org for more stuff on hotter L6s.
[And I love it when people get Chevy's inline six designation right... Ford has I-6s and there was an I-6 Japanese submarine, but GM called them L6s!] Sorry about the rant. Have you read Leo Santucci's "Chevy Inline Six Cylinder Power Manual"? I hear there's now a 2nd edition. Also Larry Page, "Twisted6" on this forum, drags an early '60s Nova with a 250. He's also a Lump Porting expert. Look him up. Good luck. Have fun.
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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10-19-2013, 02:20 PM
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#7 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Anybody built up a 250 L6 engine?
You can also look up member "Krull" on the board.He's had a 6 or two that were warmed over.There is also a book avail from Motorbooks.com and/or Barnes and Noble.
Chevrolet Inline Six-Cylinder by Leo Santucci ISBN1-931128-15-4 He's making killer power with a 6.
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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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10-25-2013, 10:22 PM
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#8 |
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"Junkyard Dog"
Join Date: Jan 2008
Location: Springfield Oregon
Posts: 2,527
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Re: Anybody built up a 250 L6 engine?
Wow...hoping up these L6's is more common than I thought. I looked at "project turbo 250" and that is a very nice build. I did some price checking on parts and labor and give the guy a estimate to build the engine. Your guy's tips really helped me alot to gain some idea's and options. We'll see what happens. Thanks!
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72 C-10 Cheyenne Super LWB, Vortec 427,TH700, 3.73 posi, tach, tilt, AM-FM,Frame off in process. http://s289.photobucket.com/albums/l...t=7eae161e.pbw 88 Monte Carlo SS bought new only 10k miles. 73 Chevelle SS 454 had since high school. 74 Camaro Z28 350 AT numbers matching, Black on Black. 73 El Camino SS 350 4sp. 70 Chevelle SS 396 4sp, number matching with LS6 454 69 Chevy C30 Car Hauler 86 K20 383 4sp 4" lift frame off restoration. http://s289.photobucket.com/albums/l...t=1b1082d3.pbw |
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10-25-2013, 11:50 PM
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#9 |
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Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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Re: Anybody built up a 250 L6 engine?
A 250 for a 63 duece, eh? I have one of those around here somewhere...
  Mine runs a rebuilt stock head, clifford mild cam, higher compression, an offy intake, stovebolt headers, and a few other things I'm forgetting. All bolted up to a T56 and 4.56s, really fun little car. Now you're making me guilty about needing to put it back together after paint. I guess that's how I'll spend my Saturday... (Now that I look at it, that's actually the first 250 I had, but the built one looks exactly the same save valve cover that won't fit because of the ARP headstuds.) There is a good site dedicated to Novas called Steve's Nova Site, there are few guys running built sixes but it takes a little looking to find their threads.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
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10-26-2013, 09:24 AM
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#10 |
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I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Anybody built up a 250 L6 engine?
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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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10-26-2013, 11:34 AM
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#11 |
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"Junkyard Dog"
Join Date: Jan 2008
Location: Springfield Oregon
Posts: 2,527
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Re: Anybody built up a 250 L6 engine?
Yup thats it..gota love the old duece's. Hey putting it back together after paint is the fun part!
__________________
72 C-10 Cheyenne Super LWB, Vortec 427,TH700, 3.73 posi, tach, tilt, AM-FM,Frame off in process. http://s289.photobucket.com/albums/l...t=7eae161e.pbw 88 Monte Carlo SS bought new only 10k miles. 73 Chevelle SS 454 had since high school. 74 Camaro Z28 350 AT numbers matching, Black on Black. 73 El Camino SS 350 4sp. 70 Chevelle SS 396 4sp, number matching with LS6 454 69 Chevy C30 Car Hauler 86 K20 383 4sp 4" lift frame off restoration. http://s289.photobucket.com/albums/l...t=1b1082d3.pbw |
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11-25-2013, 05:53 PM
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#12 |
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Registered User
Join Date: Sep 2012
Location: Oregon
Posts: 3,303
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Re: Anybody built up a 250 L6 engine?
Check out Tom at 12bolt.com http://www.12bolt.com/ go the videos section. His Malibu is the same combo I'm using and like it in the Burb
 
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