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Old 11-12-2017, 11:40 PM   #1
King951
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Question Looking for tips / recommendations on 350 build.

Hey there,

I currently own a 1971 C20. It is my daily driver / work horse truck. It currently has what I believe is an all stock 307 with an unknown amount of miles on it. Rite now the truck is running fairly good. I am looking to get a 350 block, put it on my engine stand, and build it over a long period of time while still using my current engine in the mean time. I am not looking for high performance, just a nice reliable rebuilt 350 that would make a great work truck. The current 307 has a fair amount of torque, but nothing to brag about. It has a 2bbl rochester carb, stock heads, stock exhaust manifolds, etc. I have build a few old Ford engines in the past, but this will be my first SBC. My main questions are regarding what block / heads should I look for? What vehicle(s) has the ideal 350 block / heads if any for rebuild purposes? (Assuming there are differences in 350 blocks.) As you can tell my knowledge of the SBC is very little. I would like to take my time with this build, gather as much knowledge as possible, and at the end have a nice reliable engine to drop in my work truck.

I may be considering putting a TH350 or TH400 behind the engine. I currently have a 3 on the column, and as much as I love it, it has given me nothing but issues. (Mainly linkage problems, etc.) Plus, manual transmissions can get old pretty quick in SoCal traffic.

Like I mentioned, I am not looking for something high performance, but at the same time I am not against standard modifications such as 4bbl, possibly headers / aluminum intake / etc. assuming it is within reason. Something that I can load with flooring and pull my trailer comfortably.

I am not looking to go a fuel injection route.

Any information or points in the rite direction are much appreciated.

Thanks in advance.
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Old 11-13-2017, 12:07 AM   #2
Captainfab
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Re: Looking for tips / recommendations on 350 build.

You are going to get a few differing opinions on what to do. First you should take as look at what it is going to cost in your area for all the machine work plus parts to completely rebuild a 350. In some parts of the country it is cheaper to simply buy a GM crate 350 engine. If I were in your situation I would look for a '96-'02 L31 Vortec 350 to build. Going this route gets you the best small block production head made, plus you have the ability to run a factory roller cam. With compression of 9.3-9.4 and this cam, you will have a good reliable torquey small block.

https://www.summitracing.com/parts/n...7395/overview/

Of course you will need the Vortec specific intake manifold, a 600cfm carb and a HEI distributor.

This is the basic engine I am talking about except with a carb instead of the EFI.

https://www.summitracing.com/parts/n...5815/overview/
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Old 11-14-2017, 05:24 PM   #3
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Re: Looking for tips / recommendations on 350 build.

The sbc is a great motor to build and work on...there are almost no limitations on directions or performance...and it is a very economical engine to fix up, build or modify.
Are you doing this for the sake of economics? or interest? or?
...as mentioned the 'crate engines' are pretty cheap relative to what you might spend in building one....or at least competitive and a lot faster and easier to get done.

As for the transmission...you would be better served to get past the TH350/400 option and move up to the 4 speed automatics like the 700R series or the 4L60 transmissions. You will get better mileage and performance out of them.

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Old 11-14-2017, 06:01 PM   #4
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Re: Looking for tips / recommendations on 350 build.

I think CaptainFab nailed it for you, I feel you would spend that sort of money and effort rebuilding one you pieced together...

There use to be a SBC offered which cost around 1500 bucks, mostly stock and offered into older vehicles. Summit or Jegs use to sell them but I did not see them listed....Good Luck in whatever you decide and have fun !!!!!
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Old 11-15-2017, 03:35 PM   #5
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Re: Looking for tips / recommendations on 350 build.

I'm with CaptainFab on this one as well. I'm building mine, but that's because I had a good Vortec 5.7 core to work with. I also opted to go with the HT 383 cam to get a little more out of it.
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Old 11-15-2017, 04:18 PM   #6
King951
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Re: Looking for tips / recommendations on 350 build.

I appreciate all the feedback. Assuming I went the route of the Vortec but do not want to buy a crate engine, what truck / engine would I be aiming for from a parts yard? I can get engine machine work done for close to nothing and I enjoy putting things together myself. My father has a 02' GMC Sierra 2500 HD with a 6 liter Vortec and that thing still runs like a clock after a quarter million miles, so I could see them being reliable engines. Just curious as to what donor to look for.
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Old 11-15-2017, 04:41 PM   #7
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Re: Looking for tips / recommendations on 350 build.

96 through 2002 (limited applications in 2002). If you want the 4-bolt main look for a 3/4 or 1 ton truck or van.

By the way, the 5.7 Vortec and the 6.0 Vortec aren't the same engine design, but the 5.7 is a great engine.
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Old 11-15-2017, 10:01 PM   #8
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Re: Looking for tips / recommendations on 350 build.

One thing I didn't see mentioned is that a GM crate motor comes with a 3 year/ 100K warranty. It dies, they replace it. I was going to rebuild mine but after doing the math the crate motor is just a bit more and the warranty swayed me.

Last edited by Kudzupatch; 11-16-2017 at 09:34 AM.
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Old 11-15-2017, 11:44 PM   #9
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Re: Looking for tips / recommendations on 350 build.

The L31 Vortec 350 was installed in '96-'99 trucks and '96-'02 Express and Savana vans. And yes the 3/4 and 1 tons had 4 bolt main blocks.
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Old 11-16-2017, 07:17 PM   #10
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Re: Looking for tips / recommendations on 350 build.

Go captainfabs route. I also asked this question and after more than a year of contemplating am getting ready to take his advice. You just cant beat 2k for a long block with vortec heads that you can slap your own intake/carb/efi combo on and also have a warranty. I looked at lots of options. build myself from bottom up, top end kits on a used engine, LS engine etc and I think Captainfab is spot on with his recommendation. Its a roller engine that with a cam swap, long tubes, eddie rpm, and 650 cfm carb could crank out 300plus hp and close to 400tq. For 1100 bucks more you can throw a mildly built th350 trans behind it from summit and have a reliable engine/trans combo that should last you a long time.
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Old 11-17-2017, 11:04 AM   #11
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Re: Looking for tips / recommendations on 350 build.

If you do decide to go the junkyard Vortec route there are a few things you should be aware of. It's pretty rare to find used Vortec heads that aren't cracked; my machinist got new, heavier castings for me for about $200 each. You'll need a new intake manifold (different bolt pattern) and flexplate or flywheel (Vortec has a 1-piece rear main seal). If you find one with the fuel pump hole drilled consider yourself lucky (I found one, so they're out there); otherwise you'll need an electric fuel pump. The temperature sending unit won't fit, but forum member A1971Blazer does a really nice job of turning them down on a CNC lathe. You'll have to do a little bit of massaging to get your accessory drive brackets to work, but they will. However, if you're considering a serpentine drive, it would be a good idea to pick one up from your donor vehicle. Your stock exhaust manifolds will work (I'm using Dorman 2.5 center dump rams horns on my Blazer). Your stock motor mounts will also work. Your distributor will need a mellonized gear (available separately, but included with many aftermarket HEI distributors).

On mine I'm running the HT 383 cam (more torque, plus it has the fuel pump lobe), a Cloyes double roller timing set, and I put in a bronze tipped fuel pump rod.

I think that's about it, but if you have any questions, just ask. Good luck.
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