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04-19-2018, 01:35 PM | #1 |
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Can anything be done with a 307?
From help I received on here it was determined my 68 has a 307 out of a 72 Chevelle in it. Its a 2bbl 130hp turd. Ive gotten it running after years of sitting and it seems to run fine, idles good, timing is right on the mark etc. What can I do to squeeze some extra power out of it and gain some sound? Not interested in swapping cranks or heads or anything. Is it even worth fooling with or should I just consider that 350 crate motor ive been eyeballing?
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04-19-2018, 01:51 PM | #2 |
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Re: Can anything be done with a 307?
Tear it apart clean and paint it real nice! Get a thick piece of glass cut , the size of a coffee table. Sell it to some dude for his man cave. Take the money and buy a sbc 350. Lol! Not worth wasting the time. Even if you make it sound good it will run like a dog!
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04-19-2018, 02:11 PM | #3 |
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Re: Can anything be done with a 307?
Some people really value those old 307's.
Back when I thought my truck had a 307 in it I was talking to a guy who uses them in his racecar and he had nothing but great things to say. You might find someone locally who wants it, but I'm with Robznob11, just sell it and put in a 350. You'll be a lot happier with that!
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04-19-2018, 02:24 PM | #4 |
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Re: Can anything be done with a 307?
Some will argue with me, but you can put a 4 Bbl carb on it for some extra passing power.
I built a 283 years ago and a friend built a 307 at same time. both had 4 Bbls, both performed much better, the 307 obviously a little better because of the cubes. Cam really needs to be a stock piece, much more and you lose low RPM cylinder pressure, killing street driving. A quadrajet will work good on a 307, just make sure you get parts and tuning info from Cliff. cliffshighperformance.com Having done this, the engine did it's job but was NO obvious powerhouse. I build nothing smaller than a 350 anymore, preferably a 400 or larger...400 small blocks are the only way to go... |
04-19-2018, 02:32 PM | #5 |
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Re: Can anything be done with a 307?
Bore and stroke it. 327 crank and heads.
Vroooooom
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1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
04-19-2018, 03:41 PM | #6 |
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Re: Can anything be done with a 307?
I wasn't aware that you could stroke a 307. It was my understanding that a 307 was essentially a 283 block with a 327 crank based on dimensions, so it's basically already a "stroked 283"? Correct me if I'm wrong, but that's just what I've read on the specs.
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04-19-2018, 03:52 PM | #7 |
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Re: Can anything be done with a 307?
1972 will have poor heads for performance. A set of .194 heads with a 4 BBl and cam will wake it up.
They had good torque. I pulled a truck on a car hauler home with my 72 and it handled it it quite well.
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04-19-2018, 03:52 PM | #8 |
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Re: Can anything be done with a 307?
Oh my, It already has a 327 crank.
Noe on the 350 crank contacting the block, a little grinding might make that work, although at the cost of needing custom pistons....that probably kills it for most of us, hello 350 or 400 SB |
04-19-2018, 04:01 PM | #9 |
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Re: Can anything be done with a 307?
Forged crank (like the 60s) or cast?
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04-19-2018, 06:48 PM | #10 |
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Re: Can anything be done with a 307?
307 crank will be cast. The 307 was the bottom line V8 replacement for the 283. All 307's were 2 Bbl, all small valve heads. It was the grandpa and grandma engine option.
Thinking was different back then. Car buyers, dealership folks making order decisions were likely born during or before the depression. Money was seldom spent for ANYthing luxurious. A pickup with a V8 was nearly a scandalous thought, much less going ahead with the purchase... |
04-19-2018, 07:06 PM | #11 |
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Re: Can anything be done with a 307?
there great engines. it will do anything asked of it. if you want a little more iron 4 bbl manifold, Q jet , decient set of stock gm iron heads with 1.94/1.60 valves, ram horn exh manifolds, melling towing cam , gm electronic dist. but I prefer points myself.............. blocks are heavy castings.
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I BELIEVE IN JOHN 3:16 Last edited by BCOWANWHEELS; 04-19-2018 at 07:44 PM. |
04-19-2018, 07:21 PM | #12 |
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Re: Can anything be done with a 307?
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04-19-2018, 08:28 PM | #13 | |
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Re: Can anything be done with a 307?
Quote:
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04-19-2018, 08:33 PM | #14 |
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Re: Can anything be done with a 307?
My buddy got this one. And it's scary in a 41 ford coupe! More than enough and a smoking price.
BluePrint 383 Small Block Chevy Crate Engine https://www.speedwaymotors.com/BlueP...ine,52467.html
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04-19-2018, 11:11 PM | #15 |
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Re: Can anything be done with a 307?
Just pull it out and send it my way...they really are a great motor, fuel efficient, reliable, and will haul or tow almost anything you need to. You can get a bunch of power out of them with some work and money but that wasn't gm's intentions when they designed them.
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04-20-2018, 07:31 AM | #16 |
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Re: Can anything be done with a 307?
Not trying to say do what the article put forth, just showing that more power is there is you want/need it, which is what you were asking. When/if the time comes for me to rebuild my 307 that's in my truck now, I would put in a new crate motor. What's better than a fresh motor, with a warranty. Good luck.
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04-20-2018, 08:21 AM | #17 |
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Re: Can anything be done with a 307?
Still light years better then the junk they make now...
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1968 Chevy C10 307 3ott fleetside 1967 Chevy C/10 V8, 3spd, fleetside lwb.Sold 1967 Chev C/10 step, 383, M21. SOLD |
04-20-2018, 10:21 AM | #18 |
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Re: Can anything be done with a 307?
Mine runs great and has plenty of get up and go in my truck, but it’s an original 68 truck 307. The only thing that’s been done to it is a 4 barrel has been added. The day before yesterday I turned on to the interstate ramp in third gear, had to almost stop at the top because of a stupid construction stop sign, was probably going 25-30 mph, and then accelerated to interstate speeds without downshifting. has enough torque to not lug in third gear below 5 mph with brakes applied. And will take off in first without giving it any gas and will crawl around on its own. Of course this is probably largely due to the SM465 and 4.11 rear end. But it is a torquey engine no doubt.
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68 C10 long-fleet, Long and low is the way to go. factory: 307 sbc, SM465 4-speed, 12 bolt 4.11 rear end. 75,000 original miles. Build:Ole Blue Millennial and can drive stick. "Too many people have opinions on things they know nothing about. And the more ignorant they are, the more opinions they have." -Thomas Hildern Last edited by 1968 baby blue C10; 04-20-2018 at 10:28 AM. |
04-20-2018, 10:55 AM | #19 |
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Re: Can anything be done with a 307?
You can add 305 heads (416 castings), Summit k1102 cam kit and find an aluminum intake(from the 1980's 305 and 350's) to wake up your 307. You should be able to get all used or free for under $200.00
Last edited by Warrens69GMC; 04-26-2018 at 04:13 PM. |
04-20-2018, 12:01 PM | #20 |
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Re: Can anything be done with a 307?
You can make a fine cruiser with it but if you're talking about a motor that you can stand on it and boil the N-50s for a 1/4 mile-then a 307 probably is not the right choice
Principal problem is lack of available high performance pistons for the bore size. But that said, boring them to 4" and hoping the piston wall liner holds up was a popular roundy round trick in claimer motor classes -- results in a large journal 327 -- but those guys' werent that concerned with blowing through a $25 salvage yard block either
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04-20-2018, 12:22 PM | #21 |
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Re: Can anything be done with a 307?
had a stock 307 in my 68 GMC. Hated it for no other reason than it was a 307. Never gave me problems and I gave it to my friend and he ran it forever-no troubles.
Last edited by ho70; 04-21-2018 at 08:27 AM. |
04-20-2018, 12:35 PM | #22 |
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Re: Can anything be done with a 307?
Rule to live by..... THERE IS NO REPLACEMENT FOR DISPLACEMENT....
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04-20-2018, 12:36 PM | #23 |
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Re: Can anything be done with a 307?
I bought a 350/290 from JEGS for $2347.08 delivered with intake, exhaust and water pump gaskets. I already had my 4bbl intake and Q-jet. I am putting it in today. That's not double the $2000 but does require getting a carb and intake. Plus, there is no rebuild labor other that installing the intake, carb water pump and exhaust manifolds.
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04-20-2018, 02:30 PM | #24 |
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Re: Can anything be done with a 307?
Glad this is getting some talk going. I would be down for a crate 350 but I’m kinda digging on beefing up the 307. I’m thinking heads, cam, intake l, etc. Try to squeeze 300hp out of this motor would be cool. I’m not all about max hp but I’d like people to see a 307 and be like what!!! Thanks for the help guys
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04-20-2018, 02:37 PM | #25 |
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Re: Can anything be done with a 307?
They didn't typically have any alloy in the block and were pretty soft. Not known for going huge miles without some significant cylinder wear.
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