anyone know if you can take parts from the 350 and put them on a 307? i just need the outer stuff like, altenator, distributer, and the waterpump. any help would be greatly appreciated. ------------------ 1986 camaro Z28 white w/cardinal red interior 383 stroker more to come soon. working on engine.

yes almost every exterior part of the 307 can be used on a 350. they are both small block chevys.

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Assuming of course that it's a Chevy 307. If it's an Olds 307, nothing interchanges.

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"So many Mustangs, so little time..."
ICON Motorsports

Why in God's name would you want to ditch a 350 for a 307?

He never said that he was putting a 307 in an f-body, or any other car. He just wanted to know if the parts would swap. READ. HEHE!!! You're starting to do what I do. ASSUME. Ask anyone on here. They'll tell you I'm an assuming a$$hole.

"If I could be like Mike." -Gatorade

OH THANK GOODNESS!!!! I read the posting description and thought you were putting a 307 in your car! WHEW!!! What a relief!

are 307's decent engines for a gas saver until my 383 stroker is ready? i haven't heard any thing bad/good about them.

id expect it to get the same gas mileage as a 305. Ive had a 307 and it got 15-17mpg around town...but ive never had a 305 to compare it too. The 15-17 was with it running bad and me getting on it all the time. Its a decent enough little engine...temporarily.

Nothing particularily wrong with a 307. They simply aren't good performers but it will work fine for a temporary motor. They use a taller motor mount then a standard 350. It's an extremely common mistake for people to swap out a 307 for a 350 and not change the motor mounts in the car. Then they wonder why the 350 doesn't sit right and why motor mounts keep breaking.


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Yes... it's a big block

thanks guys. i really do appreciate your replys.

Mounts are the same as a 350. Or a 262, 283, 302, 305, 327, or 400 for that matter. Externally all SBCs have the same dimensions, with few exceptions like early 265s (55-56 model) that lack the necessary motor mount provision altogether.

If of course this is a Chevy 307...

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"So many Mustangs, so little time..."
ICON Motorsports

And '57 265's and 283's...

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Quick Question? Can you swap all the old parts off the 307 for a 350? Harmonic Dampner, Flexplate. I have a mustang and the old and new 302 and 289 used two difference parts, but I don't know about the Chevy, 307, and 350.

Damper, yes, but new ones are so cheap it makes more sense to just get a new one.

Flexplate, maybe - depends upon the year of the 350. '85-earlier, yes. '86-later, no. But, new ones are so cheap it makes more sense to jet get a new one.

hi,

i had a 1968 biscayne with a stock 307 cid/2bbl that i bought in 1976. it had well over 100,000 miles on it. it was a 3spd stick. it ran fast. i beat a few 327's autos in a short run. (1/4 mile) i put in mechanical oil pressue, and water temp gauges when i bought it. (hate idiot lights) it would run 35lbs oil pressure at idle, when warm. and when i shut it down, the pressure would drop verrrrrry slowly, a sign og good bearings! not bad for an engine with 100,000 plus. temp? i think not!

bob

sorry, it double posted

I don't feel bad posting here since "bob" already did. I currently have a 67' Biscayne that runs pretty good with a 2bbl 307/3-spd and gets decent mileage. The 307's weren't performers stock by any means (all came with 2bbl carbs, low compression, 75cc head chambers, 1.7x intake valves, and highest HP rating was 200(but thats more than the 305 HO rated at 190)) but they can be hopped up pretty good, all a 307 is is a stroked 283(3.875 bore) using a large journal 327 crankshaft (3.250 stroke). If you can make x horsepower/torque with a 283, then you can do the same or better with a 307. Think of it as a small bore 327, kinda like a 383 is a small bore 400 (4.0" bore with 3.750 stroke compared to 4.125 bore and 3,750 stroke). I am also running mechanical oil pressure/water temp gauges in my Biscayne, as well as a volt meter and a mini steering column mounted tach (by the original column shifter hole, mine is floor shift right now)




Now "some" early 307's had short water pumps and no accessory bolt holes on the heads, so swapping the 350 stuff might not work if you have one of these engines. Another common thing which confuses some people is the use of a pressed on balancer with NO bolt holding it to the crankshaft. I guess GM didn't feel the need to tap out the crank snout and spring for a bolt. Also as stated, they don't use a taller motor mount. Some got the taller mount but that was based on chassis need, not engine block. The block is just like any other small block chevy (except for the late 50's exceptions as noted), nothing special there. As far as swapping parts, I see no need in using the original 307 dampner (it's thin, crappy and new ones are cheap) and the flexplate would work if it was a pre 86' engine but why bother again unless yuor stuck on your budget. You would also want to make sure you use the starter (if room allows, depending on how big your stock one from the 307 was) to make sure your tooth pattern matches up or spring for a new starter (which is more than a new flexplate really)


P.S.- You can also use 283 pistons with 400sbc rods (283 pistons come in forged variety where all 307 aftermarket pistons come cast) to beef up the bottom end (you could go the eagle 5.565 rods). The reason for the 5.565 rod is the 283 piston and 307 piston use different compression/pin heights but share the same bore. You could even run a SCAT 5.580 rod and 307 pistons on a 350 3.480" stroke crank to achieve 333.4ci if running a .030 overbore. The SCAT rod would keep the compression distance on a milled 9.0 deck block at around stock, .025 in the hole. This is because most aftermarket 307 pistons run a shorter than stock compression distance (1.675 stock compared to 1.655 aftermarket). If you used original pistons you could get by using a 400 rod to keep things on the cheap for an NA motor (would put it .020 in the hole, using a .028 gasket would still put you in reasonable quench of .048)

Not true. The 307's were rated gross flywheel HP, while all 3rd gens were rated net flywheel HP. 190 net is about 235 gross.

You are correct in the ratings change (forgot about that, didn't they change that early 70's?) but I've never seen a 305 HO stock put out 190 at the rear tires (which would be 20% or so drivetrain loss as an estimate giong off 235 gross, well around 188). Now of course I've never been around a no mileage one straight off the floor, all the ones we've done/seen were higher mileage engines but averaged between 155-170(on a good day). Alot of engines back in the 50's/60's/70's were also underrated. I don't think the 307 is one of these but the 302 DZ code camaro was underrated, as well as the LS6 454 (suggested) and other engines. The point to my comparison was that alot of people have no problem building a 305 but the 307 is every bit as good (my opinion a little better because of increased bore size).

The factory has never used rear wheel horsepower ratings.

did I say that? I was stating that on chassis dyno's I have never seen one put out the 188 (which would be 20% loss from the "gross" rating as suggested) so a rating of 190 "net" doesn't seem all to accurate but like I said, I have never tested a bone stock one straight off the showroom either so 100K+ miles can do anything to a motor.

Okay, 190 net FWHP would probably be closer to 220-225 gross FWHP.

Why are we arguing this again lol? I was just pointing out the 307 is not a slouch POS that everyone discards without thinking twice. If you have one and don't feel like buying a new motor, you can make one scream. There is a Nova near me running 13.12's with a bolt on 307 (crower 280 cam/tarantula intake/600cfm carb/headers and a 4-spd). Forget what gears he has though.

what i found ironic was that i was just on wikipedia before i found this thread, and i was looking over all the GM engines, and i read about a 307 since i had never heard of it, and i was thinking in my head, "man 307? i wonder if its as mean as a 302" then when i saw the hp ratings for it, i was dissappointed.


but if you have a spare engine lying around i dont see any reason not to use it.

The stock 307 uses crappy 1.72 intake valved heads with 75cc chambers and a 2bbl carb. It was meant as a replacement for the 283 and to be more economical at the time. In reality it's just a stroked 283, and if you fix the problems with it, crappy heads/intake/carb, you can make some good power. These things also get great (for the time) mpg as well. I have heard of manual trans cars getting near/over 20mpg in stock form. Mine averages around 17 right now with in town and some highway (2400rpm at 60) in a big Biscayne, a Nova or Camaro should be better. The 283 came in a 315hp offering, so a stroked version should be able to make just as much don't ya think? No where near as mean as the 302 in stock form but can be close if built (of course leaving the 302 stock), and you wouldn't have to spin it to 7000rpm either. Some of the 307 guys do spin them that high every weekend and make some good track passes as well.