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Chevy/gmc 307 engine

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PJBROWN

02-05-2007 17:07:38

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A few years back a bought a old c-60 for the dump body on it. I put the body on a newer truck and never did anything with the c-60. The other day I was thinking about taking the engine out of it to sell. I ran the numbers and it is a 307. Where they a good engine ??

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jerrycpp(WA)

02-06-2007 17:22:28

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

I ran an automotive machine shop for many years. For some reason the 307s were very hard on valve guides. Once we sleeved the guides and put on some positive valve stem seals, they seemed to be as good as the 265, 283, 302, and 327 engines. Then the 350 came out and that is the one everyone wants.

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frankiee

02-05-2007 20:19:49

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

I heard that they were bad oil consumers.
My old 69 ate oil like gasoline.(almost)
I was 16 then
I have good memories but I dont think that was because of the engine.
I think that the fouled up plugs helped me grow up by slowing me down back then.
It was good enough for me back then hooked up to a power glide. I would likely buy it if I had a vehicle to put it in.
I am biased though

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MF#1

02-05-2007 19:40:00

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

They were GREAT to bore out 0.125, some 11:1 pistons, put a good crank, 3/4 race cam, and camel hump heads on them! BTDT. Otherwise, not much.

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2x4

02-05-2007 22:07:47

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Re: Chevy/gmc 307 engine in reply to MF#1, 02-05-2007 19:40:00

what size engine were they after boring out?

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KJF470

02-05-2007 21:55:56

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Re: Chevy/gmc 307 engine in reply to MF#1, 02-05-2007 19:40:00

What is a 3/4 race cam? Is it something that only has 3/4 of the lobes? Just curious!

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Mike (WA)

02-06-2007 08:09:11

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Re: Chevy/gmc 307 engine in reply to KJF470, 02-05-2007 21:55:56

3/4 cam is not a precise definition of anything. So called "full race" cams of the day were ground such that you had virtually no power or driveability below 3000 RPM- so pretty difficult to drive on the street. "3/4 cam" became kind of a generic definition of a grind about halfway between stock and full race- agressive enough to put you sideways when you got into it, but tame enough to drive on the street, with the added benefit of a rough idle that gave you some street cred at the Burger Barn.

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J.C.H.

02-06-2007 11:51:30

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Re: Chevy/gmc 307 engine in reply to Mike (WA), 02-06-2007 08:09:11

Shades of my Youth. I was a Teenager in the early 50's with numerous old Chevy's with Gimmy 6 Cyl's., A Drag Racer in the 60's with a 57 Bel Air Chev Fuelie and a Paved Short Track late Model Stock Car Driver and then Owner in the 70's and 80's all Chev's with 355 CI.Chev's except for one 502 CI Big Honker Chev in 81. A Chev V/8 with a Full Race Isky Cam is Music to the ears of Motor head like me.I'm still at it just a few Months shy of 70 years with my 85 Cherokee 4X4,has a 350 Chev Vortec hooked to a Chrysler 727. It is still fun so why not?

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2x4

02-05-2007 22:11:48

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Re: Chevy/gmc 307 engine in reply to KJF470, 02-05-2007 21:55:56

I think the back of the cam lobe is cut in so that once the tip of the cam has been passed, the lifter drops off quickly instead of sliding down same slope as front of lobe.

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MF#1

02-06-2007 05:58:42

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Re: Chevy/gmc 307 engine in reply to 2x4, 02-05-2007 22:11:48

I never did the math but somewhere around a 327+? A 3/4 race cam vs a full race cam is another older way to describe a cam with LOTS of lift/duration. We used a Crane 330? not sure about that number, it"s only been 30+ years.

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jdemaris

02-05-2007 17:40:20

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

For a Chevy enthusiest at the time - they were disappointing engines. The 307 replaced the 283. The 283 had a forged-steel crankshaft and was naturally high-revving. The 307 was basically a 283 with a 327 crankshaft in it - but cast-iron and no longer forged steel. Around the same time period - GM made several changes on all the SB engines - they led to rapid valve guide wear, poor breathing, plastic-toothed timing gears coming apart, and camshafts and lifters going bad like clockwork. Supposedly, the Parkerization hardening process was flawed. It was standard procedure in our shop to put Crane cams in the sick SBs and I never saw one of them fail.

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02-05-2007 18:41:57

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Re: Chevy/gmc 307 engine in reply to jdemaris, 02-05-2007 17:40:20

I do remember the 305's and some 350's having this problem. I don't remember the 307's having any problems. Maybe they did. I simply don't remember.

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jdemaris

02-06-2007 06:35:46

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Re: 265-283-302-305-307 engines in reply to Reply, 02-05-2007 18:41:57

In regard to the oil burning from valve-guide wear, plastic coming apart on the timing gear, camshaft and lifters wearing out, etc. - it was not a problem specific to the 307. It was a general problem GM had at that time period with ALL their small-blocks. I had a new 70 Nova with a 307 and it never had a problem - same goes with my 68 Chevy PU with a 307. But . . . many did have problems. In comparison - I never saw a single Ford or Chrysler with a worn-out camshaft during that time-period. In 1968, the 283 was replaced by the 307 and it was cheapened quite a bit. The 283 block was supposedly high nickel content and the crankshaft was forged steel. None of that was carried over to the 307. Our #1 repair in the shop early 70s was timing set, valve guides and seals, camshaft and lifters - for small blocks - mostly 307s and 350s.
With many, the plastic tooth-coating on the camshaft timing gear would fall apart, and bits of plastic would plug the oil pump screen. In 68 - the 307 came out and was basically a cheapened 283 with a 327 crankshaft and stroke. It was a low-performance, 2 barrel carb only engine. 1967-69 - for Z28 Camaros only - a special 302 was offered - it used the first small-block bore from the first small-block 1955 265 V-8 along with a 327 crankshaft and stroke. It was a high-performace engine only. I drove one brand new in 69 and it was the most amazing car I've driven in my life. In 1976 305 came out and was made in low and high perforance versions. It too used the original 1955 vintage bore from the 265 engine - but with the crankshaft and stroke from a 350. More like a tractor engine, I guess with a long stroke as compared to the bore.

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supergrumpy

02-06-2007 08:24:10

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Re: 265-283-302-305-307 engines in reply to jdemaris, 02-06-2007 06:35:46

I went thru Flint engine plant in 1969, a high point of my teenage years, they were putting the 302's together there, would fire the engines up on propane to check oil pressure and such

when they tested a 307 they let them idle a while and gradually increased the rpms and checked everything out

when they put a 302 on the stand, they immediately cracked the throttle wide open and the roar shook the building, those engines weren't gonna last any 150k miles

my memory is a bit fuzzy but I think they told us that Z-28 302 was 327 block with 283 crank, big piston plus short stroke to get the revs up

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Don L C

02-05-2007 17:19:27

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

A lot of 307cu GM engines laying around...too small for any power and most of them had soft cam shafts....and GM left that way for years....ask any good private shop, they will tell you putting cams in 307s paid the utility bill evrry month....
No I an afraid your 307 isnt worth much.....

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Gary in Mozarks

02-05-2007 17:12:26

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

you can go to www.mortec.com and get all the specs for it, they were great engines.

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Bob

02-05-2007 17:10:18

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Re: Chevy/gmc 307 engine in reply to PJBROWN, 02-05-2007 17:07:38

They are (obviously) a member of the SBC family, and, AFAIK, no better, and no worse than the rest of the family.

I have a 1969 3/4 ton with a 307, and it's never given me any trouble.

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Allan In NE

02-06-2007 01:35:49

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Re: Chevy/gmc 307 engine in reply to Bob, 02-05-2007 17:10:18

Yep,

All peas in a pod with the only difference being the bank for the buck. Seen one, you've pretty much seen 'em all. :>)

Allan

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37 chief

02-05-2007 18:00:16

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Re: Chevy/gmc 307 engine in reply to Bob, 02-05-2007 17:10:18

I will have to agree with Bod. I had one in a jeep station wagon and gave years of good service, It was the jeep that I had trouble with. Stan

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2x4

02-05-2007 22:03:22

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Re: Chevy/gmc 307 engine in reply to 37 chief, 02-05-2007 18:00:16

didnt everybody?

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TDK

02-05-2007 19:12:00

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Re: Chevy/gmc 307 engine in reply to 37 chief, 02-05-2007 18:00:16

I'll have to agree with Bob & Chief. I have one in a '72 1/2 ton p.u. and it has been a dependable motor. As far a power goes,,,, can't brag on it there.

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