Chevy 307 knock and squeal, any ideas?

[pagrunt]

This just came to me, check the balancer. I had a 307 in my '72 Monte when I put it together & didn't think about getting the correct press on one, just thought a small block is a small block & that 350's will work. I found out the hard way getting onto I279 at the Venture St ramp hi revving going through the gears. In third gear over 3500 I launched it off the crank. Wrecked the balancer, took a chunk out of the cranks key way, took out some guys brand new tire as the balancer banged off the Jersey barrier. Ended up having to replace the crank after the cobbled fix with another 350 unit. Then same result with yet another 350 balancer. Ended up fixing it with a 283 out of a friends '67 Camaro. Did learn one thing from this, a 307 runs very smooth with out a balancer.
Check to see if the balancer is loose & if it's not the thin press on that a 307 used. It could also cause the squealing which I thought was the belts. Another thing to understand the 307 will not in most cases be tapped for a balancer bolt.

 

[lilbowtie]

As I said I'm curious - any news??

 

[bracketchev1221]

Be nice to know oil pr.

This would be a confirmation for sure. I would drain the oil right now. It sounds hurt. The fact that it stalled and wouldn't crank, sounds like it spun a bearing. If you had a gauge, the oil pressure would probably be pretty low right now.

 

[DRIVEN]

Guys, it's done. Toss it in the scrap pile and strap in a replacement. Aside from educational purposes, any time and money spent on a stuck 307 is wasted.

 

[TURNA]

Motor Honey will fix it!!!!!

The fact that oil wasn't shooting off of the rockers, very low oil pressure

 

[driver]

my money is on a defective bearing
i had the same in my van same sound
in my case one halve of the bearing slided on top of the other causing a stall and loss of oil pressure affecting the hole engine depending on how long you drove it with low oilpressure end of storry for the engine
my advise swap engine en put in some aftermarket gauges for monitoring info on the engine

 

[Wagonman100]

That does not sound good. 307 engines were not well thought of back in the day, so a replacement 350 is the way to go. You might want to tear the 307 to see if there is damage to the block. If the info I got in the past is correct, the 302 from the sixties used the same block as the 327 and 350 and a short stroke crank. You can actually build a 350 from it since it has the 4.00 bore. But if it is a small journal block, then someone looking to build the ‘67 version of a 302 would be looking for that block. Later 302 engines used large journal cranks and the blocks for those would be more common. Look at you casting number on the block. 1967 was 3892657 and ‘68-‘69 was large journal and had a casting number of 3914678. You could have a block worth a bit of money to help finance the new engine. Good luck with it.

Here’s and article on the engines if you want to read it: http://holisticpage.com/camaro/camaros/302.ham

 

[pontiacgp]

I think the op must be working on installing a 350 cause he has gone AWOL...

 

[pagrunt]

That does not sound good. 307 engines were not well thought of back in the day, so a replacement 350 is the way to go. You might want to tear the 307 to see if there is damage to the block. If the info I got in the past is correct, the 302 from the sixties used the same block as the 327 and 350 and a short stroke crank. You can actually build a 350 from it since it has the 4.00 bore. But if it is a small journal block, then someone looking to build the ‘67 version of a 302 would be looking for that block. Later 302 engines used large journal cranks and the blocks for those would be more common. Look at you casting number on the block. 1967 was 3892657 and ‘68-‘69 was large journal and had a casting number of 3914678. You could have a block worth a bit of money to help finance the new engine. Good luck with it.

Here’s and article on the engines if you want to read it: http://holisticpage.com/camaro/camaros/302.ham

The 307 has the same bore as the 283 & original 265 (3.875), it has the same stroke as a 327. All 307 have large journals. The 302 does have the same bore as the 327 & 350, the same stroke as the 283. '67 302's had small journals & the '68-'69 had large journals.

 

[pontiacgp]

I had a 68 Impala with the 307 and a powerglide transmission. I beat the crap out of that car and with the 2 speed transmission floored it would shift to 2nd at close to 70 mph and never had an issue with that engine