Am I wrong or is there something in the year 1970 concerning (another lack of proper term) crossover from 69' part to 70' parts? Let me explain. I just took delivery of an early 70'. It has different iginition sheilding and different air cleaner than my later 70'. I have been looking at 69' cars on line and it appears that the shielding is the same on early 70' cars. Went did Chevrolet start using the dual snorkle filter housing. Therefore and hencetowith there must be a period of time that the early 70' cars changed. Just joking on the hencetowith. I am not that bright so someone else must have noticed this......right? Oh, both cars are L-46 350/350 loaded with options and 4 speed both. Mike.

 

You might have to get an NCRS book to find out that information. Most of us on this forum don't go beyond one syllable words.



Rick B.

 

I could be wrong on this but I think the base vettes in 1970 had the dual snorkle intakes. That being said, my base vette did not have this intake on it when I got the car. It had a drop base cleaner and the chrome lid.

 

Mike - how early is your '70? Mine is a Feb.29 build date, #4269 off of the assembly line. I have an L46 also. I have an open element, chrome lidded air cleaner. The dual snorkel was for the base motor, however, I think I remember reading where there was a change on this. You should pose your question here on NCRS. Someone there will definitely know. As far as the shielding, I think it should be the same as your other.

 

Mike - I searched the archive at NCRS and here's a thread on it:


Jim Kennedy <Send E-Mail> -- Friday, 22 September 2006, at 12:09 p.m.

Hi Gang:
I have an early 1970 350/350hp 4 speed (one or the forst 500) that currently has an open chrome lidded air cleaner. I thought I read somewhere that the early cars had this, then changed to dual snorkle. Can anyone shed some light on this for me?
Thanks!!!
Jim

You got it right *NM*
Terry #3966 <Send E-Mail> -- Friday, 22 September 2006, at 12:14 p.m.

Re: C-3 1970 Air Cleaner
Scott Sims #43568 <Send E-Mail> -- Friday, 22 September 2006, at 1:04 p.m.

I think I read in some publication that it was around VIN 8000 when it went to dual snorkel.

Re: You got it right
Jim Kennedy <Send E-Mail> -- Friday, 22 September 2006, at 1:22 p.m.

Thanks Terry, and thanks for letting me bother you in Marlboro last weekend with my question on the 70 shifter and how to adjusted so it won't get stuck in gear. I have to get under it to fix it, hoping to take delivery of a 4 post lift first... thanks!!!

Re: C-3 1970 Air Cleaner
Dennis Delpome <Send E-Mail> -- Friday, 22 September 2006, at 2:58 p.m.

got a june 16 L-46,(since 73), with an open element

Re: C-3 1970 Air Cleaner
Terry #3966 <Send E-Mail> -- Friday, 22 September 2006, at 4:37 p.m.

TIM&JG (old one) says arouns s/n 12000 for the change. That puts you a little late for the change Dennis, but maybe your car got the last one. I'm guessing you are around 12,400 or so.

12981 *NM*
Dennis Delpome <Send E-Mail> -- Friday, 22 September 2006, at 5:10 p.m.

Re: C-3 1970 Air Cleaner
Travis Williamson <Send E-Mail> -- Friday, 22 September 2006, at 5:52 p.m.

Ive got #10039 and it has an open element.

Could any of you post some pictures of your engine compartments? Id like to see some for reference.

thanks

Travis

Re: 12981
Chuck Sangerhausen <Send E-Mail> -- Friday, 22 September 2006, at 6:36 p.m.

Dennis, which distributor shield does your car have?...one piece or the box type?

Re: 12981
Dennis Delpome <Send E-Mail> -- Friday, 22 September 2006, at 6:46 p.m.

3 piece box

Re: C-3 1970 Air Cleaner
Jim Kennedy <Send E-Mail> -- Friday, 22 September 2006, at 7:38 p.m.

If I could figure out how to post I would send you some of mine, although I know there are many, many un-original sins under that hood... I tried the archives on posting instructions, but didn't get too far. Maybe I need to look somewhere on the site somewhere...
Jim
P.S. Thanks to the rest of you for the input, my 00487(+/-) mus be o.k. with the open element, cool, more money for the wiper door stuff and trim!!!

Re: C-3 1970 Air Cleaner
Travis Williamson <Send E-Mail> -- Friday, 22 September 2006, at 10:30 p.m.

Hey Jim

I posted a tutorial on how to upload images. Try it out. If you have any questions let me know.

Click Here for: Image Posting Tutorial

Re: C-3 1970 Air Cleaner Picture
Jim Kennedy <Send E-Mail> -- Saturday, 23 September 2006, at 2:55 p.m.

Here goes... picture of my early 70 350/350hp engine bay (open air cleaner)5... 4... 3... 2... 1... KABOOM!!!!

Re: C-3 1970 Air Cleaner
Jim Kennedy <Send E-Mail> -- Saturday, 23 September 2006, at 2:56 p.m.

WOW! It worked!!! Thanks!!!

Re: C-3 1970 Air Cleaner
Chuck Sangerhausen <Send E-Mail> -- Saturday, 23 September 2006, at 4:05 p.m.

Hmmm...Interesting.

Recently, I determined from the AIM that in 70, they added another forward harness clamp on the inner fender adjacent to the horn relay. Your car doesn't appear to have ever had it, and mine (17074) has it. See the AIM, UPC 12, page A6, Rev 5 dated 12/18/69; I doubt that the change would have actually occurred until well into 70 MY. I wonder how many aspiring mechanical judges know that?

OTOH, I wouldn't bet my life that even a Bowtie car would actually match the AIM exactly...I have found fastener deviations on parts that I KNOW were never off the car.

Alternator Brace Bolt Headstamp
Chuck Sangerhausen <Send E-Mail> -- Saturday, 23 September 2006, at 4:26 p.m.

Hey, Jim...Just for grins...what headstamp does your alternator adjusting bolt have? From what vendors sell, and what I found on the car, I assume the correct fastener stack-up is plain washer, star lock washer, and 5/16" bolt, all zinc plated. AIM calls for plain washer, spring lock washer, and 5/16" bolt (AIM finishes believed to be black from the washer PN).

Re: Alternator Brace Bolt Headstamp
Joe Lucia <Send E-Mail> -- Saturday, 23 September 2006, at 5:50 p.m.

Chuck-----

The AIM does specify a 5/16 bolt, split lockwasher, and flat washer for BOTH the 1969 and 1970 model years. In fact, exactly the same parts are specified for both years. The specified bolt is a 5/16" bolt which is zinc-plated and of GM material grade 280-M (i.e. SAE grade 5, 3 line). The lockwasher specified is a plain finish (i.e. not plated or otherwise finished). I have no specs on the flat washer.

However, I can tell you, for certain, that the parts originally used on my 1969 were a 5/16" grade 5 bolt which was zinc plated. The flat washer was a special thick washer (about 3/32" thick) and zinc plated. There was no split lockwasher used, at all. Instead, there was an external tooth star washer of plain finish.

Re: Alternator Brace Bolt Headstamp
Chuck Sangerhausen <Send E-Mail> -- Saturday, 23 September 2006, at 6:20 p.m.

Hi, Joe...Thanks for confirming my belief and adding additional important detail. I have made a note in my AIM for future reference.

Re: C-3 1970 Air Cleaner
Dennis Delpome <Send E-Mail> -- Saturday, 23 September 2006, at 7:59 p.m.

OH OH. Steel shroud and overflow on an L-46? I've been told no, but I wonder....

BTW Chuck I have the clamp by the horn relay.

Re: Alternator Brace Bolt Headstamp
Terry #3966 <Send E-Mail> -- Saturday, 23 September 2006, at 9:59 p.m.

I believe the split lock washer on the alternator adjustement came into use during the 1969 model year. I am used to seeing the split lock washer (where used) in a dark finish.

Re: Alternator Brace Bolt Headstamp
Chuck Sangerhausen <Send E-Mail> -- Saturday, 23 September 2006, at 10:35 p.m.

Uh-oh. Terry, by "where used", do you mean you see lock washers of both types (star lock washer and split lock washer), and "where used" the split washer is black?...Or, are you saying you typically see only the split lock washer, and it's black? The AIM part number for the lock washer is PN 103320, which is a 5/16" split lock washer, probably black oxide.

Re: Alternator Brace Bolt Headstamp
Terry #3966 <Send E-Mail> -- Sunday, 24 September 2006, at 12:00 a.m.

Sorry for the confusion. Maybe it is too late at night for me.

The "where used" reference was to emphasize the alternate external tooth washer. On those Corvettes with the split lock washer I am used to seeing that split lock washer being dark colored. I believe it is black oxide, or perhaps the heat treatment used turns it dark colored.

If I were judging 1968 and early 1969 I would expect to see the external tooth washer.

It might be interesting to determine the washer style break-point, if there are enough board members with reasonably original 1969s on the board.

Re: Alternator Brace Bolt Headstamp
Joe Lucia <Send E-Mail> -- Sunday, 24 September 2006, at 6:38 p.m.

Terry-----

My original owner 1969 was built mid-September, 1969. In fact, 37 years ago TODAY it was somewhere in transit between St. Louis, MO and Fremont, CA. Anyway, my car definitely was originally equipped with an external tooth star washer for the alternator brace-to-alternator fastening.

Re: C-3 1970 Air Cleaner
Joe Lucia <Send E-Mail> -- Sunday, 24 September 2006, at 6:42 p.m.

Dennis-----

I think that it's possible that some 1970 L-46 were originally equipped with aluminum radiator, circular steel shroud, and external supply tank. This combination was used alternately during 1969 for L-46 applications, although most of the 69's found with it will be early cars. Nevertheless, I believe that some 70's with L-46 were similarly equipped.

Addendum
Joe Lucia <Send E-Mail> -- Sunday, 24 September 2006, at 6:53 p.m.

By the way, I believe that the major reason for the use of the copper/brass radiator on most 1969 and 1970 L-46 as well as the vast majority of 1970-72 LT-1 had to do with the much improved efficiency of the plastic fan shroud and sealing system which the copper/brass radiator enabled. As far as cooling capacity, the 3155316 aluminum and 3018803 copper/brass were roughly equivalent. However, although it generated less drag and wind resistance at cruising speeds, the circular steel fan shroud was very inefficient at cooling, particularly at idle conditions.

Re: Addendum
Dennis Delpome <Send E-Mail> -- Sunday, 24 September 2006, at 8:47 p.m.

Joe,

Guess my sarcasm didn't come across. My 70 L-46 has a steel shroud/ expansion tank since I have had it.(1973). Inquired about it many many moons ago here.

Re: C-3 1970 Air Cleaner
Mark 40391 <Send E-Mail> -- Monday, 25 September 2006, at 9:43 a.m.

I have a 70 350/350, June 4th car with no air cleaner and no ignition shielding. Would I be correct in getting an open cleaner and the one piece distributor shield, or could I go either way?

There also seems to be several options on valve covers, too. Could anyone shed any light? Mine has some nasty leaky aftermarket chrome ones on it that really need to go.

Thanks for the help,
Mark

Re: C-3 1970 Air Cleaner
Chuck Sangerhausen <Send E-Mail> -- Monday, 25 September 2006, at 10:49 a.m.

Yep, by the book, the open element air cleaner and the box type distributor shielding should work for you. Your VIN would be JUST BEFORE they started using the either the dual snorkel or one piece distributor shield, so you really have no choice.

In 70, the L46 used the same valve cover as the LT1...it's a good news/bad news situation. The good news is you have the perfect right to wear really classy valve covers on your engine because it came that way, but the bad news is they're going to be expensive to buy, and then you'll probably have to pay big bucks to get them restored.

Re: C-3 1970 Air Cleaner
Mark 40391 <Send E-Mail> -- Tuesday, 26 September 2006, at 1:19 p.m.

Thanks for the help, Chuck. Didn't want to go down the wrong path....that's exactly what I wanted to hear.

Are the reproduction valve covers any good if I have a hard time finding originals (or money for originals)?

Thanks again.
Mark

Re: C-3 1970 Air Cleaner
Chuck Sangerhausen <Send E-Mail> -- Tuesday, 26 September 2006, at 1:54 p.m.

I didn't know they were being reproduced, but it's not too surprising. I considered them once to dress up my base engine...NOS were still out there a few years back, but relatively expensive. Used originals could also be had, but they usually needed restoration to be presentable. Sorry I can't be more help.

Re: C-3 1970 Air Cleaner
John Hinckley <Send E-Mail> -- Tuesday, 26 September 2006, at 3:19 p.m.

Mark -

The good news is that the LT-1 finned aluminum valve covers (with drippers) are still available from GM; the bad news is that they're highly-polished.

 

The L46 Vert that just came in (no I am not a dealer) was built in Feb as well, 4481, if I have my facts correct. It has the open element and the inclosed housing for the ignition. I found the guy that owned 20 years ago and he painted it white from Cortez silver......WHAT? So someday I will bring it back to correct color. Darn it cost a lot of money to paint a car. Spent most of its life in Arizona so dry as bone.
Thanks for thread, it helps.

 

Mike,

Sometime after serial # 12,000 in 1970 closed element dual snorkel air cleaner housings were used on ZQ3, L46 & LS5 engines, only the LT-1 continued with the open element style housing.

Small blocks from around serial # 12,800 thru 14,000 use inconsistentley both styles of ignition housing, after this only the open style housing is seen. Big blocks up to around serial # 16,700 use the closed style ignition style housing, after that they use the open style like the '71 & '72.

 

Thanks, I knew I could get good info from you guys.

 

who are you calling silly ??? watch your language !!!