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#1 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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350 to inline 250 Swap
Hey guys, my 350 is bad and I've been wanting an inline 6 for a long time, so yesterday I bought a good used 250 from a 73 Nova (If I decided it properly, it is actually a 75 model) it looks like it already has an HEI coil but it is external, not inside the cap.... Am I on crack? I thought they are in the cap like usual, but this sure looks like an HEI coil...
At any rate, I am just looking for anything anyone can suggest for me to look out for generally speaking. I measured from the bell housing to the center of the motor mount on the new engine and on the truck and they are both 16 inches so I just need to get a new motor mount and it should line up fine. I need to get a power steering bracket but it came with the Alt and AC brackets already. Anything I should watch out for? I can't think of anything else beside accelerator linkage maybe. Thanks!
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#2 |
Registered User
Join Date: Mar 2006
Location: chattanooga tn.
Posts: 27
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Re: 350 to inline 250 Swap
I am currently doing the opposite. I belive you should have a real easy time with your swap. So far it seems that not much is different as for mounting the engine. You my need a slightly different rod for your accelerator but I don't see anything that I think would get you tangled up. Also that 75 model engine may have the integrated head if so that's not going to be a desireable setup unless you just don't care about performance. I enjoyed my inline but I'm a hotrodder at heart. As for the crack issue: Yea probably. Check out Clifford research they have a lot of neat parts for 250 chevys.
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#3 |
Registered User
Join Date: May 2006
Location: Springfield Illinois
Posts: 182
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Re: 350 to inline 250 Swap
I got two inlines one in a 63 pick-up and the other in a 72 burb. I would be interested in the part number of the dizzy with the remote coil.
I think you are going to be very happy with the 6. |
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#4 |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: 350 to inline 250 Swap
A 250 swaps in pretty easy.............My K-20 originally had a 350, which was later replaced with a 454. I bought it intending to work it and thought the BB would be good for my uses.............But I ended up totally NOT impressed, so I pulled it, dropped the 250 in and now I am as happy as a hog in SH*T with the truck
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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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#5 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: 350 to inline 250 Swap
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2bits, You will need the six cylinder motor mount towers that bolt to the frame, they are different than the V-8 ones. The ones that bolt to the block should be the same for V-8 & six. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#6 |
My truck is in pieces!
Join Date: Oct 2006
Location: Abbotsford BC Canada
Posts: 143
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Re: 350 to inline 250 Swap
WOW, going from a 350 to a 6, never heard that before.
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#7 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
Since I was a little worn out from yesterday, I decided to run around and buy everything I needed so I will already have everything ready and waiting when I am working on it. I got everything I needed except yes, the motor mounts are an issue. I figured I would need a different bracket that comes from the block down to the mount, but you are saying I actually need a different frame riser eh?
Hey "rust!!whatrust?" (or anyone else) you said you are currently doing the opposite, would you part with those mounting parts since you don't need them? I will pay. Thanks... Oh, please don't delete this post, I will contribute to this site tonight too, so hopefully it is OK for me to post that kind of thing. This site is invaluable! When I picked up the new dist cap, it didn't have the integrated coil, but it was the big diameter HEI one for sure, which also reaffirms the coil is supposed to be external. My problem is that I just don't like the way it looks. I had a '79 Stepside last year with a 250 and the distributor was set up just like a 350 with the coil in the cap, and I just think that is a little cleaner so I am probably going to take this cap and wires back and get replacements for a '79, the part # is the same online for the distributor itself, so it should sit on top just the same, but funny... they sold me a 30-1692 hmm... but I bet it will be fine. I've already got a couple of coils sitting around I can use too. For your reference: The part # for the '79 HEI distributor is 30-1697. The part # for the '79 Integrated coil HEI distributor cap is: DR2004G The part # for the '75 External coil HEI distributor cap is: DR902 (doesn't show online) All parts were from Auto Zone, Orielly's didn't even list a part# at all! Speaking of integrated, my '79 was an integrated head but this one is NOT, I think those are OK, but I wanted the flexibility of being able to put a header or a different intake on it later down the road. Oh and I got one of those itty bitty 1bbl chrome air cleaners too hehe, can't get over that! Thanks for the replies guys and I appreciate any help locating those motor mount bracket/riser deals!
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#8 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: 350 to inline 250 Swap
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2bits, We will make everything legit. I have a pair of 6 cyl frame mounts you can have if you want to pay the postage to send them. That way you aren't buying anything..... ![]() LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#9 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
Hey thanks locdoc! I just sent you the info. Thanks a bunch!
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#10 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
Looking at some pictures the brackets that bolt to the frame that hold the motor mounts look the same. The 350 has the motor mounts bolting right into the block, the 250 has the brackets I need that bolt to the block. Just clarifying
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#11 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,515
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Re: 350 to inline 250 Swap
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2bits, Sorry for the confusion on this. As stated in this earlier post mine were the 6 cyl frame mounts. If your truck had a V-8 in it I think you will still need those for the 6 cyl unless your V-8 was mounted on the 6 cyl frame mounts somehow. I know the V-8 and six cylinder are different because those mounts wouldn't work with my V-8, that's why I had them all painted up & couldn't use them. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#12 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
I sent this note below with my Paypal. I know you had the best intentions tho, no sweat. I should have sent you a picture to be sure.
I compared what you sent me with the ones that are on there and they look exactly the same so I dunno about that, what was different on yours? Maybe it was something they changed by '71, since these were from '67? If you have the Block mounts too I'll gladly pay you to ship them, I am just focused on being able to get the engine installed so I can go cruizin Sunday. Anyone else have any too? I know I'll never find them at a junk yard. > > ----------------------------------- > > Payment Details > > ----------------------------------- > > Transaction ID: 38158818VW890741B > > Subject: Motor Mounts > > Message: Hi Leon, Thanks for the goodies! I was looking at a picture and these should be the ones that go from the engine block to the motor mount if I am seeing correctly.
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#13 |
Registered User
Join Date: Dec 2006
Location: medford oregon
Posts: 152
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Re: 350 to inline 250 Swap
y replace v8 with 6 cylinder only thing i can think of is gas but its a hotrod there for gas isint supposed matter
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#14 |
Watch out for your cornhole !
![]() Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
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Re: 350 to inline 250 Swap
I had a lot of sixes, and they definitely have advantages over a V8. Lots of torque and easy maintenance come to mind.
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I'm on the Instagram- @Gearhead_Kevin |
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#15 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
Gas matters!
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#16 | |
Registered User
Join Date: Apr 2003
Location: Central PA....In the Berg of Nisbet
Posts: 790
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Re: 350 to inline 250 Swap
Quote:
![]() I have a Clifford heated intake, Clifford truck headers, and a 500 CFM Edelbrock on mine, and I am actually impressed at the power the little 250 has, and does good on gas while doing it. I'd have prefered a 292, but couldn't find one that was decent(Didn't have any here at the house), and we have a bunch of 250's laying around so I popped on of those in. For it being a heavy 3/4 ton 4x4 with a way heavier than stock box stakebody, it scoots pretty good IMO.
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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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#17 |
Senior Member
![]() Join Date: Apr 2001
Location: Alexandria, MN
Posts: 1,462
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Re: 350 to inline 250 Swap
I almost miss my 250... its now sitting in da-burbs garage... GREAT motor, good torque and reasonable milage... also MUCH smoother than an 8 ever will be!!!
--Mike
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63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's |
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#18 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,271
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Re: 350 to inline 250 Swap
I haven't tried looking up converters but doesn't the 6 cylinder use a higher stall torque converter than a V8? Since the engine will be out and all if it needs to be replaced now is the time.
The underhood wiring harness is a bit different between the V8 & L6. Not a real big deal but you may need to work yours over. 2 bit, I think your truck has the T350 trans and a 3.08 rear, right? If so the 6 ought to pull it pretty good and get some fuel mileage. My son pulled his 250 and trans out and gave em away for $200 some years back. Smooth running and no smoke. I could have kicked his ash over that. I'm not a big fan of the 6's but cleaned up nice with a split exhaust system I like em. Check out N to Billet's build thread if ya haven't already. He has a beautiful 6 in his truck.
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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 |
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#19 |
Account Suspended
Join Date: Jun 2005
Location: Lehigh Acres FL
Posts: 205
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Re: 350 to inline 250 Swap
edited
Last edited by Liz; 03-13-2007 at 08:54 AM. Reason: please post fs and wtb in the classified areas only |
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#20 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
Oh, I also saw a post somewhere that a guy had a problem with his HEI distributor getting in the way of the AC brackets, so I think I am just going to stick with the external coil for now, the distributor is the same so it I want to swap over later, I already have the coil, I'd just need to change the cap, and nothing is going to stop me from getting AC!
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#21 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
HELP! ! ! I need some engine mounts ASAP. I will have to pay overnight again, I don't care. The ones I just got are not what I need, I thought I confirmed that I didn't need the frame mounts.
My 250 has the newer style mounts on the block that use the one bolt slide through method: ![]() but I need the older style mounts with three bolt holes: ![]() Please anyone who has them, I am totally screwed for this weekend without them! I have people coming over and everything to put the motor in. Thanks.
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#22 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
OK thanks... If anyone else has the block brackets please let me know thanks.
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#23 |
Registered User
Join Date: Oct 2005
Location: modesto
Posts: 3
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Re: 350 to inline 250 Swap
Would a 4.2 L vortec inline 6 fit the motor mounts of a 73 gmc 4x4 with a 250 6?
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#24 |
Registered User
Join Date: Jan 2006
Location: Dallas
Posts: 504
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Re: 350 to inline 250 Swap
I like my inline 6
![]() I got the engine in with no problems. I moved the crossmember and the tranny linkage bracket back 3 3/4" (the exact length from the V8 perch to the 6Cyl perch) and dropped the motor in and bolted it up to my 400 tranny. Everything looks good...
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_______________ Thomas '78 Silverado '74 Monte Carlo '47 Teardrop Trailer East Texas Classics Local Club |
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#25 |
Truck and auto performance nut
Join Date: Feb 2007
Location: McKinney,Texas
Posts: 3,848
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Re: 350 to inline 250 Swap
that poor little 6 is driving a turbo400 tranny?
![]() a turbo400 takes a bit of power to spin. you'd be better off with a turbo350.
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Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken |
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