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 1970 307 or 1978 350 
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Joined: Thu Mar 31, 2011 4:10 pm
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Location: Careville, TN
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Post 1970 307 or 1978 350
Hey all, new to the rebuilding experience, I have a question to throw out. I have a 307 out of my 70 c-10 and recently bought a 350 off a friend out of a 78 c-10. both need rebuilt, but I can only start one right now (cash flow). I am keeping them stock. The internet says that a 70 307 had 200 hp and a 78 350 had 160 hp. Is this true and does anyone have advice on which engine to put in my 70 swb?

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Rob from Caryville

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Sun Apr 10, 2011 10:09 am
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Location: Jackson, TN
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Post Re: 1970 307 or 1978 350
the hp is based on what is inside the motor , a 350 is able to produce more power than a 307 it just depends on the set up that you have for example .... just a good cam and intake can bump up hp and if you go farther than that you can put a set of 305 heads on a 350 to bump up compretion , there are many differant ways to get more hp and its not that much differant on prices iether

I was in that tight budget last year when I put my 350 together after my 307 kick the dirt , Im very happy I spent a few extra $$$$ :mrgreen:

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Sun Apr 10, 2011 10:46 am
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Location: Careville, TN
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Post Re: 1970 307 or 1978 350
Well I have them both setting here and after I get the 70 on the road I planned on letting my 84 lwb take a rest while I rebuilt the other motor for it. My co-workers are divided. some say I should keep the 307 with 70 since it came with it, others say 350 is the only way to go. just trying to get other opinions. I am just looking for a solid motor after the rebuild.

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Rob from Caryville

95 Jimmy
84 LWB C-10
70 SWB C-10


Sun Apr 10, 2011 11:00 am
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Post Re: 1970 307 or 1978 350
if you want to keep the 70 stock and you have all the matching numbers for it its worth more than if it doesnt have all matching numbers also take into consideration of what your plans are for the tuck that always helps a lil bit :cool:

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Sun Apr 10, 2011 11:05 am
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Post Re: 1970 307 or 1978 350
I like 307's cause most people yank em and I like
to be weird occasionally. I say keep it with the 70.

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Sun Apr 10, 2011 2:03 pm
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Post Re: 1970 307 or 1978 350
build the 307 just to be different. Put some decent heads on it with smaller chambers to keep compression up and install a slighly hotter than stock cam and impress all your friends with a potent 307. The power killer on the 307's was the wheezy stock heads. I actually like the shortrer stroke and bore combo of the 307 better than a 305 or 350. Remember, a 307 is basically a small bore 327.

Horsepower ratings changed from a gross rating to a net rating after 1972, so the books will say the 307 is making more hp, but it really isn't. That doesn't mean you can't build a decently stout 307. You can also bore a 307 block +.125 which will actually make a 327. I would bore it about +.80 to make around 318ci.

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Sun Apr 10, 2011 4:10 pm
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Post Re: 1970 307 or 1978 350
I'd go ahead and max it out @ .125 but that's me :mrgreen:

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Sun Apr 10, 2011 6:05 pm
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Post Re: 1970 307 or 1978 350
Yeah, but think of how cool it would be when someone asks, "What ya got in it?" you can say a 318 and they would be like: Whaaaaaat? :shock: :confused: :shock:

:floored:

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Mon Apr 11, 2011 7:21 am
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Post Re: 1970 307 or 1978 350
Maybe, but all I think about when I hear 318 is Dodge :crazy:

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Mon Apr 11, 2011 7:28 am
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Post Re: 1970 307 or 1978 350
yep :agree: 318 = Dodge AKA not good for Chevy :mrgreen:

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Mon Apr 11, 2011 8:51 am
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Post Re: 1970 307 or 1978 350
LUV2XCLR8 wrote:
I like 307's cause most people yank em and I like
to be weird occasionally. I say keep it with the 70.


I agree. Exactly what I am doing with my 68. RV cam. 305 "vortec" heads to up compression a bit. New intake and 4 bbl carb. Plus a HEI DISTRIBUTOR.

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Tue Apr 12, 2011 10:05 am
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Post Re: 1970 307 or 1978 350
LUV2XCLR8 wrote:
Maybe, but all I think about when I hear 318 is Dodge :crazy:


Exactly! Make people stand there and have to think about it.

You could also make it +.100 to make a 323.

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Matt
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Tue Apr 12, 2011 10:50 am
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Post Re: 1970 307 or 1978 350
Slick68 wrote:
LUV2XCLR8 wrote:
Maybe, but all I think about when I hear 318 is Dodge :crazy:


Exactly! Make people stand there and have to think about it.

You could also make it +.100 to make a 323.



I can see it now ..... there eyes would pop out there heads lol :floored: :floored:

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1978 2wd C10 Stepside
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1987 Kawasaki Ninja 1000R (gas saver)


Tue Apr 12, 2011 10:57 am
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Post Re: 1970 307 or 1978 350
I actually built a 307 and bored it an 1/8 of an inch and basically made it into a large journal 327. The only reason I like the 327 better is because the stroke is shorter and tends to wind up a little faster than the 350. You will have to wind the 327 a little more because of the stroke to get the same power as the 350 but either one of them are power producing engines with the right Cam and Heads. My vote would be go with the 307 but thats just me. Good luck with your project.

JRBECK64


Tue Apr 12, 2011 4:50 pm
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Post Re: 1970 307 or 1978 350
Thanks for everyones input, still not sure , but you all got me leaning towards the 307. I'll keep you posted

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Rob from Caryville

95 Jimmy
84 LWB C-10
70 SWB C-10


Tue Apr 12, 2011 7:00 pm
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