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#1 |
Registered User
Join Date: Jun 2013
Location: Brant Lake New York
Posts: 224
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keep the inline 250 or move on to a 307 sbc
Since I got my 68 gmc I have loved my inline 6 250ci, It is diffrent then most of the 67-72 trucks I see at the shows.. I added a Clifford intake and a holley 390,headers and a few other little upgrades.. At the shows the engine gets alot of attention even for being dirty and always have been proud of it,happy about the fact that I held off the temptation to throw in a sbc.. I have been pricing engine rebuild to see if I could get 1 horse power per cubic inch but the machine shop prices have pretty much crushed that idea.
I have not thought much about doing an v8 swap till an opportunity has come across my path.. a perfectly running 307 that orignally came out of a 1972 c10 but has found it home in a 60's Era Vette for the last 20 years. The owner wanted a more proper plant for his Vette and did a motor swap a few months back storing the 307 in the garage since . The owner painted the motor last year and is including the intake the MSD ignition and distributer.. asking 400 bucks. Do I stay loyal to my 250 or sell the upgraded parts and move in to the 307?? I do not imagine the swap will be too difficult, It should bolt right up to my th400, possibly need a bigger radiator and new/move the motor mounts? Any and all opinions are appreciated... Thanks to all
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68 GMC 2500 stepside LWB 250CI |
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#2 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,736
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Re: keep the inline 250 or move on to a 307 sbc
A 307 isn't much of an upgrade over what you have. If you are happy with the 250, I would leave it.
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#3 |
Registered User
Join Date: Jan 2016
Location: Spokane WA
Posts: 106
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Re: keep the inline 250 or move on to a 307 sbc
I'd keep the in line 6 if it was me.
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#4 |
Registered User
Join Date: Jan 2015
Location: Long Island, New York
Posts: 245
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Re: keep the inline 250 or move on to a 307 sbc
If you have the money to do so, keep the 250 and buy the 307 separately. If not, rebuild the 250
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Red 1968 Chevy C10: 4bbl 350 v8 1984 Chevrolet Corvette Crossfire 350 1987 Chevrolet Camaro 305 4bbl 1993 Chevrolet Cavalier RS Convertible 3.1L V6 1982 Chrysler LeBaron Convertible Marc Cross Edition ![]() |
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#5 |
Registered User
Join Date: Jan 2015
Location: Long Island, New York
Posts: 245
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Re: keep the inline 250 or move on to a 307 sbc
By the way, saw the photo of the GMC, its great looking!
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Red 1968 Chevy C10: 4bbl 350 v8 1984 Chevrolet Corvette Crossfire 350 1987 Chevrolet Camaro 305 4bbl 1993 Chevrolet Cavalier RS Convertible 3.1L V6 1982 Chrysler LeBaron Convertible Marc Cross Edition ![]() |
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#6 |
Old Duffer
![]() Join Date: Mar 2003
Location: Maine
Posts: 1,821
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Re: keep the inline 250 or move on to a 307 sbc
I'd certainly keep the I6! SBC's are all over the place. With the 250 you have "Six Appeal"!
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'68 Short C20 Flatbed Dually w/ 292 4bbl, Langdon cast headers, and WC T5 trans. '81 G10 Shorty Van "Good judgement comes from experience, and a lot of that comes from bad judgement." Will Rogers "Under promise, then over achieve." |
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#7 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: keep the inline 250 or move on to a 307 sbc
You couldn't pay me to use a 307 in any application other than a stock rebuild for a factory correct restoration.
Keep the I-6 or find a 350. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#8 |
Registered User
![]() Join Date: May 2014
Location: PA
Posts: 1,417
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Re: keep the inline 250 or move on to a 307 sbc
I'll take a well running 250 over a sbc anytime.
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1967 C10, LWB, 250, Powerglide, PS, PB, 3/4 STATIC DROP |
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#9 | |
Registered User
Join Date: Sep 2011
Location: Louisville, KY
Posts: 756
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Re: keep the inline 250 or move on to a 307 sbc
Quote:
I have a 250 in my '71 and the only swap it would even bother with would be an LS. I just don't think it would be worth it for a 307 and that's coming from someone with a 250 as well. |
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#10 |
Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: keep the inline 250 or move on to a 307 sbc
I have a 250 in Goldilocks and a 462 in Samson. So, I know the 250 and the limits. I just don't think the gains with the 307 swap will be worth it.
I'd keep the 6 if it was my truck and nothing was wrong with it. Plus.....it's just different than the cookie cutter V8 trucks. And I said that owning a cookie cutter V8 truck.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#11 |
Registered User
![]() Join Date: Aug 2015
Location: Pine Mountain, Georgia
Posts: 125
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Re: keep the inline 250 or move on to a 307 sbc
Keep the Sexy Six...I will be doing a Clifford w/2 deuces with headers and cam in this one if I am not talked into a LSX in this one...
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71 C10 I6 250 TH350 power steering and power breaks... |
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#12 |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: keep the inline 250 or move on to a 307 sbc
I hate to say it because i want to buy your valve cover, carb headers and intake
![]() But yea i'd stay away from the 307 and go for a 350 at a minimum.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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#13 |
Registered User
Join Date: Jun 2012
Location: Poway, CA
Posts: 119
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Re: keep the inline 250 or move on to a 307 sbc
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#14 |
Registered User
Join Date: Oct 2015
Location: Waskatenau, Alberta
Posts: 259
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Re: keep the inline 250 or move on to a 307 sbc
I too think you should stick with your 250. 307's were not a great engine. The only good thing about a 307 is you can use the crank/rods , buy a new set of 327 pistons, and slap into a nice 350 block. Instant 327....
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#15 |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: keep the inline 250 or move on to a 307 sbc
I'd only upgrade to a 292 or nice 350
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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#16 |
Go Pack Go!
Join Date: Nov 2005
Location: Green Bay
Posts: 2,669
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Re: keep the inline 250 or move on to a 307 sbc
Here's a website that will help. Www.hotsixes.com
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#17 |
BlahBlahBlah
Join Date: Feb 2002
Location: Wa.
Posts: 19,872
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Re: keep the inline 250 or move on to a 307 sbc
Take a weekend and yank the front clip off of your truck and give that engine bay and engine a super detail job. A little bit of dough, a lot of elbow work and it will look awesome under the hood.
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#18 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: keep the inline 250 or move on to a 307 sbc
With so many guys jumping onto the LS train or going big block the 6's will become "The stock engine to have " especially the 292 . there are more than a few 250's laying in garages and sheds after being considered junk not too long ago .Now I've been noticing more people wanting to hold onto them and the prices are starting to climb .Even if you decide to go V8 Hold onto that 6, Pickle it and keep it in dry storage In just a few short years it could be worth a pretty penny to the guys wanting to stay or go back stock.
![]() "I'd certainly keep the I6! SBC's are all over the place. With the 250 you have "Six Appeal"! , Sorry, But I'm going to have to use that ! I'm thinking "tri power" just for the cool factor http://www.ebay.com/itm/261842705240...%3AMEBIDX%3AIT Last edited by Grumpy old man; 02-12-2016 at 08:20 AM. |
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#19 | |
Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,560
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Re: keep the inline 250 or move on to a 307 sbc
Quote:
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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#20 |
Registered User
![]() Join Date: Sep 2015
Location: Charleston, WV
Posts: 228
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Re: keep the inline 250 or move on to a 307 sbc
I am keeping the i6 in my build. Stuffing a 700R4 behind it. I just like the novelty of running split manifold headers etc. I'm building your exact setup Clifford intake and Holly 390 carb.
I have a 350 SBC in my '34 chevy, and a 302 5.0 HO in my '41..... looking forward to the sexy six.
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Steve My Build Thread: http://67-72chevytrucks.com/vboard/s...=morning+glory 1971 C10 Inline 6 250 700R4 "Marlene" 1934 Chevrolet Master Sedan 350 700R4 "Iris" 1941 Ford 1/2 Ton 5.0 H.O Roller C-4 "Rose" 2019 Honda Ridgeline |
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#21 |
Registered User
Join Date: Feb 2012
Location: Southern Ohio
Posts: 292
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Re: keep the inline 250 or move on to a 307 sbc
Keep the six!
The 307 would likely be a downgrade in power from the 250 six. They're dogs.
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1970 C10 Turbo LM7 5.3/LS6 cam PT7675/4L80E/Holley Dominator EFI/E85 Moser 9" 3.25/4 wheel discs 11.16@121.07 |
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#22 |
Senior Member
![]() Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: keep the inline 250 or move on to a 307 sbc
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Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" ![]() "Be American, Buy American" ![]() |
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#23 |
Registered User
Join Date: Oct 2012
Location: Green Valley Arizona
Posts: 1,351
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Re: keep the inline 250 or move on to a 307 sbc
I have a 307...if you are going to make the jump to a V8, at a minimum go stock 350. Then if you get the urge for more horse power you can tweak the 350 a lot easier than the 307.
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1970 C10 Short Stepper with 71/72 front clip. |
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#24 |
Registered User
![]() Join Date: Dec 2015
Location: Holland Mi.
Posts: 302
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Re: keep the inline 250 or move on to a 307 sbc
The 283 was a great engine. In 1970 I was fooled into thinking the 307 was an updated, improved version of the 283. I bought a new C20 with a 307 and 3 speed. I had an 8' overhead camper on it for trips only and sometimes towed a boat while the camper was on. I didn't push the engine hard. At 40,000 it needed a valve job and was using a quart of oil between changes. At that same time my brother had a '69 C10 short box step side with a 250 and 3 speed. He had an overhead camper custom built for that truck and also towed a boat. We traveled together quite a bit and that inline 6 did everything my 307 did. Got better gas mileage and ran to 60,000 miles with no mechanical work. He traded it For a new '73 short box 454 Cheyenne Super. Black with blue interior and put Ansen aluminum slots and 50 series tires on it. That's another story for another day.
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#25 |
Registered User
![]() Join Date: Nov 2001
Location: Old Bridge,NJ
Posts: 828
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Re: keep the inline 250 or move on to a 307 sbc
I'm going to a V8 change myself , out with the 6 in with a 8. I like my 67 w the 250 l6 but I always wanted the 327 and since I found an all original 67 truck motor 327 I'm making the swap. I don't know your experience with a motor swap like this but this is my first swap. 6 to a 8. I did a swap years back , replaced a 6 with a 6 not hard but everything was identical. What I'm trying to say is be prepared, if you don't know already, with all the parts needed to make the change, I'm sure you don't want any down time looking for parts you'll still need like motor stands, motor mounts, exhaust system, pullies, brackets, wiring, drive shaft so on, I'm still figuring it all out myself, I don't want any down time myself I like driving my truck whenever I can. Have a blast with your truck your decision.
Nick |
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