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Old 05-01-2013, 01:09 AM   #1
profe56
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307 not 350 at my C10 69 1/2 ton.

I always thought that my truck engine was 350, until today that will lead to the machine shop to rectify, and tell me that it is a 307. I would like to read your opinions if continuing with the project to repair the 307 or change it by a 350.



I would like to modify slightly the engine, I have an edelbrock intake, and I would like to tell me that could do with the heads, pistons and the camshaft, or which of them would be sufficient. I do not prettend have a racing truck but if you have some more power would be great.

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Old 05-01-2013, 01:32 AM   #2
70blackfish
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Re: 307 not 350 at my C10 69 1/2 ton.

If it were me i would rebuild a 350,
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Old 05-01-2013, 05:52 AM   #3
DjS71
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Re: 307 not 350 at my C10 69 1/2 ton.

Not that you can't make good power with a 307, but you get more bang for your buck with a 4" bore block (327, 350, 383, etc). If I ever have to pull mine, its not going back in.
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Old 05-01-2013, 06:22 AM   #4
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Re: 307 not 350 at my C10 69 1/2 ton.

I rebuilt a 307 using an RV cam (makes low end tq/decent hwy mileage),1.94 valve heads,and a 4bbl Holley spread bore on stock manifold. The CFM was 450. I had it in a K/20 4spd w/4.57 gears and 14.50/37 tires. It got 13 mpg and had plenty of power. The best thing about a 307 is it will outlast a 350. More could be done than I did. I was looking for am engine with respectable power that would use less fuel...just like people need today.
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Old 05-01-2013, 06:33 AM   #5
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Re: 307 not 350 at my C10 69 1/2 ton.

I rebuilt my 307 stock with a 2 barrel and headers with flow masters. Not only does it sound great but I get 17 / 18 mpg every week !

You can't get that out of a 350

I love a 307
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Old 05-01-2013, 10:50 AM   #6
domeier
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Re: 307 not 350 at my C10 69 1/2 ton.

A long time ago I tried to punch up a 307 with a cam, manifold, carb and headers, and all it did was get louder.
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Old 05-01-2013, 11:44 AM   #7
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Re: 307 not 350 at my C10 69 1/2 ton.

For a good DD, that will live a long life... you can't beat a 307. If you're looking to make power out of a Smallie... go with a 350 or a 400.

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I would never rebuild a 305.
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Old 05-01-2013, 11:46 AM   #8
70blackfish
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Re: 307 not 350 at my C10 69 1/2 ton.

pull one from a junk yard, maybe look for a 400 small block 150.00
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Old 05-02-2013, 01:08 AM   #9
profe56
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Re: 307 not 350 at my C10 69 1/2 ton.

Thank you for al your comments and opinions, I like what Brian Plaster did.
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Old 05-02-2013, 07:11 AM   #10
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Re: 307 not 350 at my C10 69 1/2 ton.

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Originally Posted by domeier View Post
A long time ago I tried to punch up a 307 with a cam, manifold, carb and headers, and all it did was get louder.
That'll happen with any motor if you don't get the right combination. You can even hurt performance. A 307 from '70 has HP that rivals the 454 that came in a SS454 truck,just for a little perspective. No,those weren't break your neck powerhouses,but you catch my drift. A 307 isn't as anemic as some seem to think.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
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R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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Old 05-02-2013, 07:31 AM   #11
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Re: 307 not 350 at my C10 69 1/2 ton.

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Originally Posted by special-K View Post
That'll happen with any motor if you don't get the right combination. You can even hurt performance. A 307 from '70 has HP that rivals the 454 that came in a SS454 truck,just for a little perspective. No,those weren't break your neck powerhouses,but you catch my drift. A 307 isn't as anemic as some seem to think.
I'll second that. Go drive a late 80s 305 IROC Camaro with Tuned-Port. Same exact bottom end as a 305 in a Caprice. If you have a chance to drive both cars it will make a fuel injection believer out of anyone.
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