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Chevrolet 307 V8 Engine

The Chevy 307 V8 engine came along in 1968 to replace the Chevy 283 V8. The engine was used in lower performance oriented family type cars and was equipped with a 2 barrel carburetor. After 1973 the 307 was chopped from the GM line engine lineup.

One interesting fact regarding the Chevy 307 V8 was that it was also manufactured by GM for boat use and sold by the Outboard Marine Corporation as a high performance marine engine. The marine version of this engine produced between 235 and 245 horsepower and even used the same aluminum valve covers that were used in Corvettes and Camaro Z-28s.

Comment Script


307 coolant specs
i need to flush my 69 chevy c/10 307 coolant system. Do i need to use a certain coolant on her. Just flushed it few months ago. well drained the radiator and refilled with green anti freeze 50/50. Now its brown. this time i will flush it the right way. Just wanna make sure i use right coolant. ty
#22 - tim - 06/08/2016 - 03:21
Im thinking about putting a stroked 307 in my 86 k15 4x4. Would that produce enough torque and horsepower to pull around 33 inch tires?
#21 - Carson - 01/26/2016 - 17:53
Back to 2 bbl
I have a '68 Chevelle/Nova 307 in my '71 Chevy 1/2. At 300,000 miles I had it rebult. Bigger cam, 350 heads and I already had slapped an AFB on it years before. It screams! And even with the AFB (not street legal but who ever checks your carb ), I still get around 15+ mpg.

However, I'm thinking of going back to a stock 2bbl and am wondering if it will be a problem with the cam and 350 heads?

Any thoughts?
#20 - Lynda D - 09/12/2015 - 16:24
Just FYI,in 1973,307's got 1.94" valve heads but lost compression because of the larger chambers. All 307's had flat top pistons,so getting more compression is as simple as swapping on a set of early 327 heads IMO,the 307 when paired with 1.94" valves responds well to having the bores notched around the intake side.
#19 - rich s - 06/17/2015 - 01:09
timothy did you ever get a response to your question? I have the same problem with my 1992 4.3 chevy pickup. I have a 307 I would like to put in my pickup replacing that tired 4.3. any help would be appreciated. sincerely tom
#18 - thomas newberg - 05/11/2015 - 18:02
69 chevy truck
What is the firing order on the distributor with points and which way should the rotor be facing because its not starting its blow air out instead of sucking in through the carb.
#17 - Rob - 03/18/2015 - 22:24
Master Mekanicus
I must say that the wheezing little 307 is worth far more than some folks would like to admit. I just yanked the one out of my highschool car, a '68 Camaro. When I originally got the car at age 15, I popped a bearing cap off and it looked fine. Had a double-roller chain and a four barrel. Oh man did it run. gave me a 14.2 quarter at the highschool drags. Fast foreward to sixteen years when a rebuild is needed... The previous owner slipped a 327/350hp cam in it and bolted up the small-valve double-hump heads. The engine will be rebuilt and put back to those specs. Somehow, the combo worked perfect. Could put turn of the century mustangs to shame and got 17mpg to boot.
#16 - Curley - 11/20/2014 - 20:28
Will my chevy 307 handle a 4 bbl carb?
#15 - Cody - 03/20/2013 - 02:07
307 rebuild
im rebuilding a 307 in my 1970 c/10 original motor im slapping 700r4 trans behind it for over drive my ? is i believe my head or heads is cracked i have two dead cylinders in middle passanger side what do u recommend on what cylinder heads i should use if mine are cracked to get better performance with out paying $1000.00 (carb setup replacing 2bbl for 4bbl) i love this motor served 43 yrs with out rebuild
#14 - Tony T. - 12/07/2012 - 16:59
I have three sets of Head Gasket sets for an authentic restoration of a 307 Chevy engine. They are authentic GM. Call 570-742-8817 if interested. Byers Built Engines in Milton, PA 17847
#13 - Mike Byers - 09/06/2012 - 20:11
I've stuffed a 307 with Corvette Heads,a 262/270 cam and a 4 B Holley 1850.into my old 52 Chev.I think it should act about the same as a H.P.327. Whats your openion? B-)
#12 - Danny - 07/21/2012 - 22:27
I just got a 1966 Chevy C20 and it has a 68 307 from a Chevelle and its all original....2bbl and even the 'Turo-Fire 307' air cleaner lid. It runs very well and is adequate power with the 4spd in the 3/4T truck. The 305 has long been my favorite small block, but this 307 sure is off to a great start!!
#11 - TC - 07/01/2012 - 07:09
307 balancer
I have a 73 Nova the previous owner said it has a 350 how ever i notice it has a small and thin balancer on it. I'm also having a hard time reading the # on the back of the block most old schoolers I talk with thinks it could be a 307 is it other way i can verify if it's a 307. Thank You
#10 - Corey Mac. - 05/28/2012 - 04:24
My father owns a 1959 Chevy Apache with a 307 mounted to a three-speed. On it are a 4barrel Carter Carb, headers, hi-output dist, and a wide-core radiator. Though these mods are minor, they make the truck run great, look clean under the hood, and overall offer satisfying performance for a smaller engine. If I wanted to upgrade the tranny to 4-speed floorshift, should I also look into a bigger engine?
#9 - Eamon Ault - 03/05/2012 - 17:11
307 intake
i have a 307 out of a 1968 impala. has a 2bl Carb on the intake. im wanting to upgrade and go to a 4bl carb. im looking to upgrade to the Quardrajet Carb with the Quadrajet intake. Question. My current 307 has an oil fill tube on the FRONT of the block (closest to the FAN). Will this need to be removed to accomdate the new Quadrajet Intake and Carb?
#8 - Ryan - 02/27/2012 - 06:24
another great day to get dirty. Im restoring a 68 chevelle. ive got a 2bbl 307. can i rebuild it to be a 327? i like the idea of keeping the original 307 badge on the car but want the added performance.
#7 - steve h - 02/08/2012 - 00:07
ATTN Kenneth
58 to 62 psi in compression is a dead engine. Anything less than 100 psi I would not expect to start. Even compression as low a 120 psi I would consider a very worn 307. My 307 ranges between 150 to 155 psi in all 8 cylinders. If you read my previous post you are already aware of the problems you may run into with an old 2 barrel but in your case I would say you have a serious compression problem and any presence of fuel wetting your plugs does not necessarily mean you have a carb problem but simply not enough compression to fire. A gas engine needs 4 basic things to run: sufficient compression, fuel, air and spark
#6 - Jay - 01/27/2012 - 07:21
ATTN Tori Stephens
ATTN Tori Stephens
I have owned a 1970 Chevelle with a 307 for 19 years. The 4 barrel carb is a good thing as long as the right size carb was selected. Bigger is not better it is easy to over carb an engine. Sadly I was forced to make the 4 barrel swap in the late 90's too. The 2 barrel carbs are wearing out the cores are old and subject to cracking and metering rod problems. I went through 4 rochester 2 barrels rebuilt by holley in their factory in a month and a half before I realized this truth and had to make the swap to a small edelbrock 4 barrel. Unfortunaley nobody is making new castings of 2 barrel carbs which is what is needed to keep the 307 in "original" running condition. The small 4 barrel I have on mine have worked very well for many years don't let the 4 barrel carb discourage you. It is a necessity to keep these cars running well
#5 - Jay - 01/27/2012 - 06:52
307 with 4 barrel carb
Considering buying a 1971 Chevelle with a 307 motor. The owner replaced the 2 barrel carb with a 4 barrel - is this a good thing?
#4 - Tori Stephens - 01/14/2012 - 06:39
I had put Autolite Platinum AP25 that came gapped at 0.045 set the points a 10 thousands trimming at 8 degrees because it would not run at 4 degrees. Worked good until you a load on it. I had changed the gap on eth plugs to 0.35 my timing bounces between 10 and 12 degrees and runs better after adjusting the points to 18 thousand. it won’t start after warm up unless I hold the choke and accelerator at 25% :-o
#3 - Kenneth - 12/31/2011 - 21:58
I recently picked a used Chevy 307 that was in a 1973 Chevy Nova, it has the original two barrel carburetor. I out in in my 1971 GMC C2500 Truck to replace its original 307, after driving for 10 miles it began to pop and back fire and would not accelerate. Is stopped and adjusted the points in which it worked for another two miles. After replace the points I have not been able to get it to start. I checked compression and all cylinders show between 58 and 62 psi. There is spark at each spark plug though my exhaust is clogged and i think my carb leaks a lot of fuel
Am I accurate with believing that carb leak is the problem
#2 - Kenneth Rinderhagen Junior - 12/19/2011 - 00:39
Re: Major Undertaking

The 307 will fit in your truck just fine.
You will need a different starter, but otherwise, everything should bolt up just fine.
If you don't wanna mess with the computer, dump it and run a 4-bbl (works fine).
Edelbrock intake ok, but check with your local GM dealer. The old LT-1 intake from the early 70's are still available (NOS) in some places.
#1 - General Project - 08/13/2011 - 08:21
Major Undertaking
I have a 1990 Chevy V6 thats just about dead & i have a chevy brand new rebuilt 307 V8 .Will it mount in my 1990 chevy K1500 4WD 1.5 ton Automatic Trans. Is there any way to get the 307 V8 to run in my 1990 body . This truck came in a V8 also could i buy a Elberbrock intake for the 307 V8 so it will run & i know i will have to change the computer from a V6 to A V8 it this impossible or could we do it my buddies know thier stuff about autos thats all they have everdone is work on cars & trucks if it not a big problem contact me & see if this is insane or can be workedout for me
#0 - Timothy Sturgill - 08/11/2011 - 10:47
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Engine Specifications

1968 - 1971 with 2 Barrel Carb
Max Brake Horsepower - 200 @ 5800 rpm
Max Torque - 300 @ 4200 rpm
Stroke - 3.25
Bore - 3.875
Compression - 9.00
Firing Order - 18436572

1972 with 2 Barrel Carb
Max Brake Horsepower - 130 @ 4000 rpm
Max Torque - 230 @ 2400 rpm
Stroke - 3.25
Bore - 3.875
Compression - N/A
Firing Order - 18436572

1973 with 2 Barrel Carb
Max Brake Horsepower - 115 @ 3600 rpm
Max Torque - 205 @ 2000 rpm
Stroke - 3.25
Bore - 3.875
Compression - N/A
Firing Order - 18436572