Hallow

Thank you all for the input. That pretty well satisfies my curiosity, you all confirmed what my friends and family were already saying. To answer your question Mike, the 79 isn't exempt, and may not pass smog...and a 74 without an engine is for sale near me...

And would knowing that the head is an A87 change anything?

Hmmm.... So, if one was to put an L-18 in a 74 620, there's no easy way to contest that said L-18 isn't of the same model year as the truck? If the answer is yes, than said truck would be smog exempt? Hypothetically, of course...

Hey all, real quick question; is there any way to tell what year my L-18 was manufactured?

I appreciate the concern and heads up, and as far as I know, you are correct. However, this thing has passed smog before, so I don't think the techs look too closely at the particular make and model and cross reference it with which year and model has what engine. Should I bother trying to fiddle with this carburetor or should I try to send it back and get one meant for an L-18?

I got the 510 or 710 from National Carburetors website. They have the L18 listed under 510 and 710. Thanks for the correction. I had originally purchased a weber after reading quite a few threads on this forum about them. When it arrived there was a note in it saying "Not CA Legal". So back it went. If I were to install the carb I have that is meant for an L20b, how or where would I hook up the solenoids the original didn't seem to have? Thank you again for your quick and clear responses.

Thank you both! I had to scrape away old dried oil, but I found "L18" and "Made in Japan A87". Theory confirmed. Engine was swapped. I imagine then this means I need the carburetor out of a 610 or 710?

As I look further into this, I am beginning to think the motor has been swapped and is not an L20-B. Can anyone let me know where I can look on the block to confirm this?

Hi all, I am trying to finally get my '79 620 running. I decided to rebuild the carburetor (it wasn't running well when I parked it), got frustrated with the rebuild and ordered a reman from National carbs. I went to install it yesterday and noticed there are some differences with it from the stock. https://goo.gl/photos/2XVpXZrrhmYvvY8m6 https://goo.gl/photos/dW1KwEBuhctkfqnA6 The old carb has a plate covering where the new one has a vacuum control solonoid https://goo.gl/photos/4DG5qq4eorxojDeF9 parts number 24 and 27 on that diagram. I have no recollection of ever pulling them off, but that doesn't mean I didn't Further, while I can see where the electric choke (blue wire)and other solonoid (red wire) hook to in the truck, this vacuum control solenoid has a white wire. The only white wire I see is this piece: https://goo.gl/photos/YG2cWJcpQjx2PGV48 That is looking at the intake, the orange rag is covering it up. I have no idea what form of devilry that part is. And it's been so long since I took all this off, I don't exactly remember where it connects. Does anyone have any idea what's going on? Can I simply remove the vacuum control solenoid and put the cover on the reman? If I goof'd and the cover isn't supposed to be there on the old carb, where does it go? Any help and advise would be much appreciated. I really miss driving this thing. -Harris