virtual

whats the diff between the 305 and the 307 will 307 fit my 83 z28 my 305 is burning oil and i can get good deal on 307 and if it do fit will i get more speed?

Bort62

307 is a Horrible Motor, and No it Wont Fit. Its a BOP bolt pattern AFAIK.


As far as the Differances, Ill have to let someone else answer that One. Im fairly sure its quite a differant casting however ( much like the 305 Differs from the 350 )

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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

nestz28

iTrader: (1)

If it's a chevy 307, it will fit just fine, it's just another small block. I actually have a 307 in my '70 nova and it's not too bad, has really good lowend and midrange power (for a stock engine) If you are concerned about making lots of power, the 307 is not a good choice, you would get much greater gains with a 327 or 350.

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'84 Z28 LG4 T-5
'92 Z28 wheels
153,000 miles
Front& rear suspension rebuild using MOOG parts
350 and WC coming in summer 2001
'70 nova 307, th350, all stock, 40,000 mi almost like new

five7kid

iTrader: (14)

Do you know what it came out of? Chevy made a 307 starting in '68 and I know as far as '73. It had the same bore as the 283 (3-7/8") and stroke as a 327 (3.25"). They never had "good" heads, cam or intake, as it was a base 2bbl V8 engine. It was exactly the opposite of the famed Z28 302 (4" 327 bore & 3" 283 stroke - good cam, heads, intake).

With good heads, cam, intake & exhaust, it has slightly more power potential than the 305, but certainly a lot less than a 327 or 350. World says their 305 heads work well on it.

If it's an Olds 307, don't walk, RUN AWAY! Like Bort said, they're horrible and won't fit anyway w/o bunches of headaches.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.93 limited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/LB9 block, ZZ3 cam and intake, WP 305 heads ported & polished, Hooker headers & y-pipe, 3" Catco cat).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.

Bort62

Oh yeh my bad, I assumed Olds.



a Chevy 307 might be neat, just for that **neat** factor




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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

gearrrhead

should fit just fine. as for more power I don't think it would be much you could look it up in an manual. it will list horsepower for different years. just get the casing numbers. I would bet you could find a good deal on a 350 though and it is a better way to go. more torque and more aftermarket potential. the small bore screws you if you ever want to throw cerain heads on. I do not understand why anyone would ever rebuild a 305 or 307. when you could find a 350 core to start with for free most likely.

gruveb

The first vehicle I owned was a big old '72 Chevy long bed truck. It has a 4 speed with the granny gear, and posi rear end. Of course it came stock with a 307, and for being stock, it was a bad boy. That truck would haul or pull anything, climb anything and did have great low end power.

It's worth a shot. If I had one laying around, I'd try it.

88SC

Interesting swap idea. Let us know how it works out, if you decide to do it. The 307 ought to have at least as much performance potential as a 305, at least in theory. And the aftermarket is coming up with hot rod parts for 305s.

History lesson - in 1957, when the idea of hot-rodding Chevy V8s was still new and weird, the biggest one available was the 283. Chevy (Zora Arkus-Duntov, anyway) built a few "factory" Corvette race cars, and they usually had non-production stroker cranks that gave them, yes, 307 cubic inches. This would have been with Rochester fuel injection, the best available heads and custom, experimental cams. I wonder what kind of horsepower they got...

Chevrolet never produced a performance version, and since there were several other sizes available (350, 327, 302), no one ever paid much attention to them.

Grim Reaper

Actually, I would say a 307 has more performance potential than a 305 because of its larger bore/shorter stroke. I don't know if a 307 could accept 2.02/1.60 heads (they too may have a problem with the valves clearing the bore). But the reason a 307 was always thought of a "dog" is because no one ever really built one. In the old days, everyone opted for a 327 block instead.

Shrouding of the valves is probably a problem, but definitely not as bad as a 305.

JP84Z430HP

I agree with Glenn and the others in that it has at least as much potential as a 305, and I see where it has more with it's larger bore. Cool thing is, if you do put it in, and decide you don't like it later on, you can put a lot of the stuff you use on it onto whatever you replace it with (headers, etc.....

I remember a few of the 307 chevy's, and they were pretty decent for a "Base" engine. They were pretty reliable too, although they were actually before my time, I have seen quite a few of them still running!

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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand.

Starting to look like the Kicker poster child!

ASE Certified Master Tech

five7kid

iTrader: (14)

We still haven't established whether it's a Chevy or Olds 307...

Well, virtual?

R.O.B.

FYI, a 307, bored .030 over, with the 305/350 crank would yeald: 3.905x.3.480=333ci.

I agree, a 350 would be a better choice, but given the cercumstances, the 307 doesn't look to bad of an idea, given a better head choice.

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Rob
'86 TA 305 TPI
Gutted MAF, Ported Plenum
TB Bypass, Home made Cold Air Intake,
Edelbrock T.E.S.

virtual

its a chev 307 from a caprice and its gone

MTCAMARO

iTrader: (1)

Too bad the 307 is gone,i just happen to have one in my 86' and it's a great little motor.Mine's a 73'block thats been bored to 4.00.The crank is the same as a 327,so basically its a 327 now .I have adapted a set of 94'tpi 350 heads to it (1.94-1.60),added a better cam,double roller timing set,305 H.O.alum. intake,edelbrock carb,and some ignition work.When is the last time you heard of a combo like this?I get tired of hearing about 305's and 350's all the time, as good as they are ,theres more out there if you use your imagination.Mines no supercar ,but i had a 5.0 mustang owner in the co-pilot seat and he don't want none of this!

82Trans Man

I had a Chevy 307 in my 82 Trans Am when I bought it. The engine was built by a friend of mine he put in an aftermarket comp cam and had a little machine work done to it. The engine ran great until the bit*h threw a connecting rod through the wall. Didn't go through completly it sorta went off like a hand gernade right in the center of the rod. There was small parts of the oil pan blown away. Until then it was a real torquey engine.

85talb9tpi

The March issue of Car Craft has a seven page story titled Everything You Never New About The Small-Block Chevy . They also have a couple of charts showing differences.


RJ

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85transam 305 TPI 210hp