questions for a engine swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mikey2409 · 05-13-2013, 03:08 PM

Hey guys need some info on a engine swap I have in mind I currently have a i6 and 3speed tranny in my 70 she seems to be tired and is starting to get a slight knock and that's said I'm planning to pick up a 305 with a th350 for the truck and I'm wonder what upgrades are needed to fit this engine in my truck besides the automatic tranny cross member and steering column
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chasinhiway · 05-13-2013, 03:16 PM

Go with a 5.3 out of a newer truck!!!

SS Tim · 05-13-2013, 03:48 PM

If you are going to the trouble of upgrading the driveline upgrade to a 350 with a TH350. Or better a new crate motor with a warranty, shipped they are under 2k. If you are wanting to use a motor because you "have it" think long and hard about its condition and installed longevity.

brad_man_72 · 05-13-2013, 04:20 PM

305, pfft. Why bother. Just go buy an ls9 for $30,000 and have chip foose install it for you. I can't believe anybody would even think of using a good running small block less than 350 cubic inches, that's just insanity!
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tmc1986 · 05-13-2013, 04:33 PM

Don't waste your time with the 305. Not a very good motor. Just go with a 350. There are an unlimited amounts of parts for the 350 and its a much better motor. Good luck
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cdowns · 05-13-2013, 04:43 PM

you will need small block engine towers and engine mounts
you will also need the linkage that mounts on the frame that is connected to the automatic steering column and the tranny
i believe you will need driveshaft work i think it needs to b shortened
you might b better off with a new radiator that has tranny cooler and fan shroud too

the 305 wiull b a slight upgrade from the 6cyl// but not as snobby as some guys who want to spend your money want// if it is lo milage and lolopriced it will get you around for quite awhile

54belair · 05-13-2013, 08:20 PM

When I started my project, I initialy considered a 4.3 v6, decided agaisnt that and considered a 305----

The 4.3 would have been down a little on power (not looking for a ground pounder--just cruising). I ended up using a 350--not only because of parts availability but for the increased torgue that comes with cubic inches (I even went with a lower rpm-higher torque cam). I am going to run a muncie 4 speed (car) and a 3.08 posi. The additional torque will be good since Im using the 3.08's.

Your idea of a 305 is very do able-----depending on your intended use.

**TBONE1964** · 05-13-2013, 08:38 PM

First thing you need to do is set a budget on this engine swap. What can you do with your budget. Will the I6 live until you can save the money for what you want? I am not a fan of the 305 just like most others. I have used them before because it was all I had and no money to do better at the time. If you must use a 305 at least an upgrade to a 350 will be much easier in the future.

Also, I would consider finding another I6 and building it up. You will get better torque and horse power from a 292 than you ever would from a 305.

By the way, I do brake inspections at Winco Foods (I-5 at exit 271) twice a year and maybe I can meet you and check out your 70 sometime while I am there.

What ever you decide, make it fun,
Tom

05-13-2013, 03:08 PM	#1
mikey2409 Registered User Join Date: Dec 2012 Location: Bell Gardens Ca Posts: 151	questions for a engine swap Hey guys need some info on a engine swap I have in mind I currently have a i6 and 3speed tranny in my 70 she seems to be tired and is starting to get a slight knock and that's said I'm planning to pick up a 305 with a th350 for the truck and I'm wonder what upgrades are needed to fit this engine in my truck besides the automatic tranny cross member and steering column Posted via Mobile Device

05-13-2013, 03:16 PM	#2
chasinhiway Registered User Join Date: Apr 2010 Location: pontotoc, ms Posts: 113	Re: questions for a engine swap Go with a 5.3 out of a newer truck!!!

05-13-2013, 03:48 PM	#3
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: questions for a engine swap If you are going to the trouble of upgrading the driveline upgrade to a 350 with a TH350. Or better a new crate motor with a warranty, shipped they are under 2k. If you are wanting to use a motor because you "have it" think long and hard about its condition and installed longevity. __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban

05-13-2013, 04:20 PM	#4
brad_man_72 the boat guy Join Date: Jul 2007 Location: springfield mo Posts: 2,339	Re: questions for a engine swap 305, pfft. Why bother. Just go buy an ls9 for $30,000 and have chip foose install it for you. I can't believe anybody would even think of using a good running small block less than 350 cubic inches, that's just insanity! Posted via Mobile Device __________________ 67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project,

05-13-2013, 04:33 PM	#5
tmc1986 Registered User Join Date: Apr 2013 Location: enumclaw, wa Posts: 143	Re: questions for a engine swap Don't waste your time with the 305. Not a very good motor. Just go with a 350. There are an unlimited amounts of parts for the 350 and its a much better motor. Good luck Posted via Mobile Device __________________ '67 2wd LWB 350/4speed.

05-13-2013, 04:43 PM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: questions for a engine swap you will need small block engine towers and engine mounts you will also need the linkage that mounts on the frame that is connected to the automatic steering column and the tranny i believe you will need driveshaft work i think it needs to b shortened you might b better off with a new radiator that has tranny cooler and fan shroud too the 305 wiull b a slight upgrade from the 6cyl// but not as snobby as some guys who want to spend your money want// if it is lo milage and lolopriced it will get you around for quite awhile __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY Last edited by cdowns; 05-13-2013 at 05:00 PM.

05-13-2013, 08:20 PM	#7
54belair Registered User Join Date: Mar 2011 Location: bolivar, mo Posts: 839	Re: questions for a engine swap When I started my project, I initialy considered a 4.3 v6, decided agaisnt that and considered a 305---- The 4.3 would have been down a little on power (not looking for a ground pounder--just cruising). I ended up using a 350--not only because of parts availability but for the increased torgue that comes with cubic inches (I even went with a lower rpm-higher torque cam). I am going to run a muncie 4 speed (car) and a 3.08 posi. The additional torque will be good since Im using the 3.08's. Your idea of a 305 is very do able-----depending on your intended use. __________________ 1997 shortie stepside 1968 short stepside 1966 mustang 1966 chevelle ss Dont always go the cheapest route--You can save yourself into the poorhouse! My Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=489030

05-13-2013, 08:38 PM	#8
TBONE1964 Cluster King Join Date: Nov 2012 Location: Junction City, OR Posts: 5,263	Re: questions for a engine swap First thing you need to do is set a budget on this engine swap. What can you do with your budget. Will the I6 live until you can save the money for what you want? I am not a fan of the 305 just like most others. I have used them before because it was all I had and no money to do better at the time. If you must use a 305 at least an upgrade to a 350 will be much easier in the future. Also, I would consider finding another I6 and building it up. You will get better torque and horse power from a 292 than you ever would from a 305. By the way, I do brake inspections at Winco Foods (I-5 at exit 271) twice a year and maybe I can meet you and check out your 70 sometime while I am there. What ever you decide, make it fun, Tom



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