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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: OVERKILL] #2933698 03/09/13 03:38 PM
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Garak Offline
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Originally Posted By: OVERKILL
Thanks, I didn't know that thumbsup


The 307 Chevs were a bit uncommon. We never had one in any of the taxis, and I only saw one example in a friend's vehicle, when we were doing a cam and lifter job.


Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, Wix 57356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: OVERKILL] #2933760 03/09/13 04:59 PM
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electrolover Offline
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Another little tid bit of info on the 307
The sbc can bore to 4 inches and make a 327 or 350

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Oldswagon] #2934031 03/10/13 12:55 AM
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SS1970chrysler Offline
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Originally Posted By: Oldswagon
Originally Posted By: OVERKILL
Originally Posted By: Silverado12
Back "in the day" when those cars were new, I ran 10W-30 and I took a 1970 307 Chevy to 140K miles and it still ran well, but had started using about 1 quart every 1,000 miles (considered normal at the time).


The 307 was an Olds motor, IIRC smile


Yes, but Chevrolet made a 307 as well. I was a 283 bore (3.875" bore) with a 327 crank (3.25"). It replaced the 283 in 1968 and went out of production after 1973. It was a lo-po 2bbl entry level V8. The 307 Olds was introduced in 1980, with a 3.80" bore and a 3.385" stroke, estentially a "debored" 350 Olds. It was built until 1990.


Yep. We had a '68 Impala 4dr hardtop with that 307 in it paired up with Powerglide transmission.


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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2934032 03/10/13 01:03 AM
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Ibrahim Offline
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HDD 30 grade oil or reg 40 grade! conventional or synth (fixed short oci's)


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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Clevy] #2934040 03/10/13 02:05 AM
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FL_Rob Offline
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Originally Posted By: Clevy
Originally Posted By: dave1251
Originally Posted By: FL_Rob
I'd go for a heavy duty 30 ,such as Rotella T5 10w30. With low miles and what sounds like a non-leaker, you can go with a nice Mobil 1 in 0w40 flavor.The ZDDP is what you're after with this engine,not just a thicker grade.


Nope. Myth's never die on the internets.

Ha. No kidding. 1100 posts and you'd think he woulda absorbed something.


Please state the myth of which you're referring to and why my opinion of which oil to run would be scrutinized as such.

Clevy...You're kidding ,right? The OP asked for opinions about oil selection and yet in the entire thread,I don't see any recommendations of your own,just an off-handed remark about not absorbing information. What's your recommendation to the OP in this matter?

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: FL_Rob] #2934219 03/10/13 09:52 AM
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1978 Vette 383" | 1986 Vette 350" | 2015 R1200RT LC | 1997 FXSTSB | 1991 300 SE | 2011 Superb 2.0 TDI CR
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: electrolover] #2934253 03/10/13 10:33 AM
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Bamaro Offline
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Originally Posted By: electrolover
Another little tid bit of info on the 307
The sbc can bore to 4 inches and make a 327 or 350

Chevy actually eventually took it to 4.125 in 3.75 in giving 400 cu in (6.6L). I believe they were all/most 2bbl.

Last edited by Bamaro; 03/10/13 10:35 AM.

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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Bamaro] #2934264 03/10/13 10:44 AM
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OVERKILL Online Content
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Originally Posted By: Bamaro
Originally Posted By: electrolover
Another little tid bit of info on the 307
The sbc can bore to 4 inches and make a 327 or 350

Chevy actually eventually took it to 4.125 in 3.75 in giving 400 cu in (6.6L). I believe they were all/most 2bbl.


I had a buddy with a few 400's. One of them had Brodix heads, solid roller cam....etc. It was in an S10, ran bottom 11's.


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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2934315 03/10/13 11:50 AM
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Norm Olt Offline
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Interestingly there were 265, 283, 327, 350, 302, 307, 400, 305 & 262 cubic inch versions of the "small block" Chevy V8. How's about 365hp with two 4bbl carbs (or 375hp with fuel injection) from a 327?

GM had about 3 (or was it 4?) versions of 350 cubic inch V8 motors (and 2 307's) not counting a diesel version: the Olds and Buick versions differed from the standard Chevy/GMC.


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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: FL_Rob] #2934737 03/10/13 08:41 PM
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Originally Posted By: FL_Rob
Originally Posted By: Clevy
Originally Posted By: dave1251
Originally Posted By: FL_Rob
I'd go for a heavy duty 30 ,such as Rotella T5 10w30. With low miles and what sounds like a non-leaker, you can go with a nice Mobil 1 in 0w40 flavor.The ZDDP is what you're after with this engine,not just a thicker grade.


Nope. Myth's never die on the internets.

Ha. No kidding. 1100 posts and you'd think he woulda absorbed something.


Please state the myth of which you're referring to and why my opinion of which oil to run would be scrutinized as such.

Clevy...You're kidding ,right? The OP asked for opinions about oil selection and yet in the entire thread,I don't see any recommendations of your own,just an off-handed remark about not absorbing information. What's your recommendation to the OP in this matter?


I am sorry to offend you but released studies have established that the current levels of ZDDP are more than adequate to protect flat tappet cams especially in the OP's vehicle. IMO the whole movement there is not enough ZDDP in modern oils has been overblown to mythic proportions when oils are analyzed from the same era as the OP's car ZDDP levels today are nearly the same. Takes this along with base oil improvement, other friction modifiers, anti-wear additives, the whole movement flat tappet cams need more ZDDP then modern oils already have just does not make sense to me.


http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=1049812&page=2


make the inside of your engine oil cap white.
don't use.
Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Bamaro] #2934755 03/10/13 09:08 PM
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Zaedock Offline
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Originally Posted By: Bamaro
Originally Posted By: electrolover
Another little tid bit of info on the 307
The sbc can bore to 4 inches and make a 327 or 350

Chevy actually eventually took it to 4.125 in 3.75 in giving 400 cu in (6.6L). I believe they were all/most 2bbl.


Different blocks guys. You can't bore a 307 to a 4.00" bore. If you did, the thin cylinder walls wouldn't last a trip to the grocery store.


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Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: Zaedock] #2934787 03/10/13 10:30 PM
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I had a '76 Monte Carlo with a 350 while I was in high school in the late 80's / early 90's. I worked in the local GM dealership after school and they let me use their hoists, etc when it needed service so there was no real excuse for not changing fluids at their scheduled intevals. That being said, I always put 10W-30 in it. Beyond that, it got no special treatment, served me well and I wish I still had it. It died in 1993 with 167,000 on the clock when the timing chain broke.

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2935121 03/11/13 10:03 AM
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fraso Offline
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Regarding OP's original question about oil weight, see 1977 Pontiac Oil Recommendations.

Unless your oil runs extremely hot, I would use a 10W-30 HDEO. See Selection of the Right Motor Oil for the...d other Engines

Re: Best oil weight for 1977 Chevy Monte Carlo 305 [Re: jhammer382] #2935918 03/11/13 09:56 PM
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coffee Offline
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I am using Castrol HM 10w40 and think it is a wonderful oil and seems to be a good fit for you as well.


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