307 engine advice - Chevelle Tech
Engine General Engine Discussion.

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post #1 of 7 (permalink) Old Sep 7th, 19, 12:09 AM Thread Starter
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Jim
 
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307 engine advice

I have the 307 out of my 69 chevelle. It was running ok with a little bit of blue smoke out the exhaust when I took it out of the car. I'm thinking of getting it freshened up and put it in a 1955 chevy pickup that I have recently acquired. Builder said it not worth it. New rings are harder than old rings would tear up cylinder walls, parts are real hard to come by. Heads have to be done. I assumed heads need work for today's gas but figured it was doable. It doesn't need to be a power house. Truck can't handle more than 45-50 mph as of now.
Read an article on jalopy journal about building sweet 307's.
Opinions/advice.
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post #2 of 7 (permalink) Old Sep 7th, 19, 12:48 AM
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Re: 307 engine advice

If I were in your position Id look around to see how much I could get a later model 1 piece rear main seal, roller cam engine for, preferably with Vortec heads. If the cost difference was reasonable Id go with that engine.

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post #3 of 7 (permalink) Old Sep 7th, 19, 8:12 AM
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Re: 307 engine advice

Stick the 307 into the '55 and just drive it as is. Meantime, keep looking for another small block to rebuild and swap them when the time is right. You will already have the mounts, exhaust, etc done.

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post #4 of 7 (permalink) Old Sep 8th, 19, 8:42 PM
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Re: 307 engine advice

nothing wrong with a 307, get a rering kit from northern auto, a RV cam, a basic valve job. it's not worth doing the hardened seats in the 185 heads. bolt it together and you'll probably get 40 to 50 thousand miles out of it for cheap. jim

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post #5 of 7 (permalink) Old Sep 8th, 19, 9:44 PM
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Talking Re: 307 engine advice

Your "builder" is full of ca-ca.
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post #6 of 7 (permalink) Old Sep 9th, 19, 9:34 AM
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Re: 307 engine advice

Keep the engine from rattling from too low of octane or too much timing and those old seats will last forever.
Never had seat issues with old double hump or power pack or any head if the tune was on.

I do not sissy drive my stuff either and I pull trailers all the time so not a load thing it is about the tune and keep good oil and filters on it including air filters.

My 1969 300hp 350 is on it's 4th set of standard bore pistons..I re ring and piston it for each new vehicle it goes into..No ring ridge never been honed except for what the factory did in 1969.
Crank has never been turned.
E251K rings were always used.

But those rings are different today.
My engine was given to me with 100,000 miles on it and now has over 400,000 miles on it.
They will live for a long time if maintained..yea cheating replacing pistons and rings now and then.

It is currently in my 4 door 57 chevy with 280H comp cam and ported 305 heads.

I will agree to the fact that your builder is full of it.

I have done many sbc and other engines the same way and never had any issues.
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post #7 of 7 (permalink) Old Sep 9th, 19, 5:23 PM
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Re: 307 engine advice

Quote:
Originally Posted by Jim Mac View Post
nothing wrong with a 307, get a rering kit from northern auto, a RV cam, a basic valve job. it's not worth doing the hardened seats in the 185 heads. bolt it together and you'll probably get 40 to 50 thousand miles out of it for cheap. jim
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