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307 Engine

 
oldschoolrodder
I love my Chevy Chevette!
Posts: 5
Joined: 12/09
Posted: 12/16/09 09:18 PM

I know I am not going to be very popular, but I a building a '68 307 block. I need to find a sourse for parts for this engine. What will interchange, and is it possiable to bore it over to make a 327. Blush  

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Pontiacman2
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Posted: 12/17/09 11:28 AM

No you can't bore it that much.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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skyeking
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Posts: 10
Joined: 08/09
Posted: 12/17/09 05:01 PM

Laugh Hi there,
    You should be able to bore it out 40/1000" OK
    I have done so. Any more than that
    would be advised to have block sonic tested
    which will tell all..Skyeking  
skyeking

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oldschoolrodder
I love my Chevy Chevette!
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Joined: 12/09
Posted: 12/21/09 05:29 PM

I thought so, I had a 283 that I bored .060 over, and it runs fine, they told me I could go .080 over.  

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Pontiacman2
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Posted: 12/21/09 06:14 PM

.080 over on what engine.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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oldschoolrodder
I love my Chevy Chevette!
Posts: 5
Joined: 12/09
Posted: 12/22/09 11:36 AM

You say you are a profesional engine rebuilder, how long have you been bulding engines? I have been bulding engines for over 30 years, but never built a 307. The .080 over was a 1957 283 chevy block. I did not bore it .080 over the walls become a little thin, and it overheats. That .080 over would make it a 301 cube engine. I am also a machinist, for over 30 years. This is why I asked you how long you have been building engines. Smile  

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Jp Civilian
V-6 Camaros rule!
Posts: 35
Joined: 11/09
Posted: 12/22/09 04:55 PM

You might be able to find an article build of a 307 or 327 if you chose to bore it over. I would also suggest taking a look at this article on build a high hp 327 in Chevy High Performance Magazine.(click on the link---->>>Wink327 Small Block Chevy Engine Build)

Hope it helps  
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"Nut up or shut up!" - Tallahassee (Zombie Land)

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Pontiacman2
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Posted: 12/23/09 01:58 PM

I have been building engines right for 15 Years why does that matter to you how long I've been doing it.  
Pontiacman2
Pontiacman2

Professional Hi-performance engine builder

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oldschoolrodder
I love my Chevy Chevette!
Posts: 5
Joined: 12/09
Posted: 12/23/09 04:48 PM

Thanks for the artical, I have researched other articals, and now I know how I am going to build the engine. Thanks to everyone for not telling me to junk it out and build a 350 engine. My next two projects are just that. Smile  

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oldschoolrodder
I love my Chevy Chevette!
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Posted: 12/23/09 04:50 PM

It doesen't matter to me. Just thought I would ask. Thanks. Blush  

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Pontiacman2
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Posted: 12/23/09 07:10 PM

No problem  
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Pontiacman2

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catalina291
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Joined: 06/10
Posted: 06/04/10 10:43 PM

.080 overbore would not make it a 301ci it would be a 295ci (or really a 294.8459ci) a 283 is 3.875 bore x 3.00 stroke. So 3.875 + 0.80 = 3.955. so .7854 x 3.955 x 3.955 x 3 x 8 = 294.8459. a 301 is 4 inch bore x 3 inch stroke same as 302 Z28 engine 301.5969ci  

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tuffnuff
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Posted: 06/06/10 03:15 PM

+1
Before GM brought out the 302 in 1967, it was common for us to bore a 283 out from 3.750" to 4.0" and end up with a 301, as it was then called.
We checked the front cam journel for concentricity and core shift,,, if it checked out OK, it was bored. Without all the sonic testing and fear of "blowing up",,, Revs were a common thing when the factory sold you a turn key solid lifter engine, that revved 7200. We outdid OEM by twisting our little 301's even higher into the 8's.
We also never experienced any overheating problems, unless the rad was too small, to begin with.
I personally built more than a dozen of these engines and I have been building racing engines since 1960, from mild to wild, in case you're interested or curious.
On a final note,,, it might be wise to get your facts straight, when doing basic engine math.
Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

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