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#1 |
Registered User
Join Date: Oct 2007
Location: Rowlett,Tx
Posts: 64
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305 to 350 swap questions
Alright the 305 in my 85 k10 is ticking and knocking like crazy and has no power anymore, in other words its time for a new engine
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#2 |
Registered User
Join Date: Aug 2008
Location: Cincinnati, OH
Posts: 28
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Re: 305 to 350 swap questions
Radiator and alternator will be the same but why buy a $2000 engine and put a used water pump on it when they cost $25-30
Figure at least $500 to pay an independant shop to install an engine and that's probably a low estimate... Last edited by bwilder10h; 09-01-2008 at 03:41 PM. |
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#3 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: 305 to 350 swap questions
Everything will fit but you might have heat issues with the stock radiator, and like bwilder10h said, I wouldn't put a used water pump on anything.
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#4 |
Robert Olson Transport
![]() Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,287
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Re: 305 to 350 swap questions
im going to echo what the others have said put a new water pump in and id get the biggest radiator i could find for it
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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#5 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 305 to 350 swap questions
replaced a fair amount of the mid 80s truck engines (305 out and the 350 in) in the last few years. The 260 HP chevy replacement is a good motor and can be beefed up a little with a different cam for a better operating performance. The radiator should be enough for the 350 and the tranny will work well with the engine. Everything that is on the 305 engine will fit the new 350--alternator, A/C, cruise brackets, exhaust should work,(if the heads are llike the ones that I have with a dual bolt pattern), temperature sending unit, oil pressure unit, and anything else that is bolted to the engine.with you being in texas, I am not sure of the shop rates down there. I have a mechanic friend and his rates are at $65.00 an hour. A change out of the engine should take about 8 hours total and that is if he is dragging his tail. Work from there.
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#6 |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: 305 to 350 swap questions
Yea I gotta agree and say that when I have a motor out I like to replace all the easy stuff like water pump and fuel pump with the carbed motors and anything else that looks like it needs to get change and would be alot easyier with it out. I would try running the rad and just watch your tempature gauge and see if it wants to get hot. Too bad you aint closer man I would do that motor swap on the cheap for you. Good luck with it all man.
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*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold ![]() -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit ![]() ![]() -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER ![]() I would rather push a Chevy then drive a ford!!
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#7 | |
Georgia Boy
Join Date: Jun 2008
Location: Douglas, Georgia
Posts: 370
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Re: 305 to 350 swap questions
Quote:
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#8 |
Registered User
Join Date: Oct 2007
Location: Rowlett,Tx
Posts: 64
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Re: 305 to 350 swap questions
Thanks for the replies guys, I'll definately grab a new water pump while I'm at it. One question, should I order the motor and everything off the internet and then take it to the shop for them to install? Will they even do that or do I need to get the motor from them somehow?
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#9 |
Georgia Boy
Join Date: Jun 2008
Location: Douglas, Georgia
Posts: 370
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Re: 305 to 350 swap questions
Most shops will install the motor for you, but they might not warranty the motor. I'd ask what kind of guarantee they will offer, though.
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#10 |
Registered User
Join Date: Aug 2008
Location: Cincinnati, OH
Posts: 28
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Re: 305 to 350 swap questions
Post back and tell me where you find the best prices on GM crate motors. I'd love to have a 383 or maybe even a 350 HO...
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#11 |
Registered User
Join Date: Aug 2008
Location: miami
Posts: 118
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Re: 305 to 350 swap questions
yearone has a 400 hp crate for 2899 1 year warr, summit has a blueprint 385 hp for 3,095 if irc
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#12 |
Registered User
Join Date: Oct 2007
Location: Rowlett,Tx
Posts: 64
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Re: 305 to 350 swap questions
Ok I found a shop so it looks like I'll have to find a good deal on the motor online and order up. Heres another question, What about headers? I dont wanna throw old manifolds on this new engine so does anybody have any suggestions on headers? Thanks.
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#13 |
Georgia Boy
Join Date: Jun 2008
Location: Douglas, Georgia
Posts: 370
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Re: 305 to 350 swap questions
I use Hedman long tubes with 1-5/8" primaries and 3" collectors. They make great torque. I didn't get ceramics because I painted mine blue with VHT high-heat paint to match the color of my truck. I guess it's all how much you want to pay and if you have any clearance issues with long tubes.
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#14 |
Registered User
Join Date: Oct 2007
Location: Rowlett,Tx
Posts: 64
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Re: 305 to 350 swap questions
Are there any that are a sure-fit on our trucks that dont require any mods like grinding, cutting, etc.?
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#15 |
Georgia Boy
Join Date: Jun 2008
Location: Douglas, Georgia
Posts: 370
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Re: 305 to 350 swap questions
I'm sure there are.. mine is 2WD though. I don't know if the 4x4 is any different. You can get them to fit your truck, without mods.. that much I do know.
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#16 |
Chevys Kick A$$
Join Date: Jan 2005
Location: Zootown, MT
Posts: 12,699
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Re: 305 to 350 swap questions
I like the hedman and hooker headers and yea you should be able to order a set that will just bolt right up. As said up above I would check into the shop wanting to warranty the work or not wanting too.
__________________
*HOODS is what I answer too* -'79, '77, '88 Pickup Sold, '85 Camaro, '83 T/A, '81,'83,'90 K5 Blazer All Sold ![]() -'79 3/4 ton "Big Yellow Bananna" Lifted 4spd. 39.5 TSL Swampers, The money Pit ![]() ![]() -'86 K5 Blazer Silverado 6.2 4" lift 35"s -'95 Ext. Cab Shorty 4" Tuff Country rolling 35" M/T's -'83 Monte Carlo T-Tops. 126,500 Original Miles -LATER ![]() I would rather push a Chevy then drive a ford!!
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#17 |
Registered User
Join Date: Jul 2004
Location: ashland oh
Posts: 660
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Re: 305 to 350 swap questions
Hello, at 16yrs old with your ambition you can do anything you want! wish i was closer would offer up some help but all i can do is give ya a good ole sermon.lol..J/K aside,first take your time,know ya want it done "NOW" but take time to check and double check everything from shop you want to use,to parts you want.MIght take a couple weeks longer than u want but like has been said above,don't go to all the work and put on (4 example)a used water pump just to have it go bad on you first trip,etc.. keep asking questions,learning,do it right first time,you will b very happy with what u can build the first time ..
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#18 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 305 to 350 swap questions
As you take stuff off of the truck---LABEL AND BAG EVERYTYHING. Go to the Walmart and purchase a full box of the heavy duty sandwich bags and a good Sharpie marker. Get a good roll of masking tape and label each and every plug hose or connector and what it goes to. If nothing else get a digital camera and take pictures of all of the items as they are removed. You will find that you are soon to have a great file of info and when you put the new motor in---it will be helpful,.
Scoggin Dickey parts outlet offers a manual for engine removal and you can purchase one through them that will make it simple---kind of a "Engine Removal for Dummies" thing LOL.... Last edited by piecesparts; 09-04-2008 at 09:03 PM. |
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#19 |
Registered User
![]() Join Date: Jul 2008
Location: Olive Branch,Mississippi
Posts: 347
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Re: 305 to 350 swap questions
First time I did it I found a big tree borrowed a comealong and replaced my motor in 2 days,everything should work but if it runs warm buy a good electric fan and thermostat and it won't any more.You can buy them at the junkyard for a little of nothing and put whatever therm sensor you want 170,180,190,even 160 to turn fan on itself
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Built chevy tuff! ![]() |
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#20 |
Registered User
Join Date: Oct 2007
Location: Rowlett,Tx
Posts: 64
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Re: 305 to 350 swap questions
Ok I have one more question I promise, I've heard somewhere that you shouldnt break in a new motor with ceramic-coated headers because the high temps will discolor them? If thats true, then what are you supposed to do, throw the old manifolds back on for break-in?
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#21 |
Georgia Boy
Join Date: Jun 2008
Location: Douglas, Georgia
Posts: 370
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Re: 305 to 350 swap questions
Ceramic coated headers are made for just that.. the coating helps keep the heat out of the engine bay and they're made to not discolor. That's the reason why they're more expensive than non-coated headers.
Ask all the questions you need to.. that's why we're here on this board! |
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#22 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: 305 to 350 swap questions
I have actually broke in two new motors with ceramic headers and they did not change colors. The ceramic coating holds heat until the exhaust is out of the header region and then the collapsing gases help to scavenge the exhasut out of the cylinders. Don't get me wrong---maybe someone has something up their sleeve, that I don't know about--but I haven't seen Bulwinkle for awhile.
Last edited by piecesparts; 09-07-2008 at 09:36 PM. |
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