265, 283 and 327 spark plugs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Cypher · 11-19-2015, 10:50 PM

Do they all use different spark plugs? I bought a 1964 chevy c10 and previous owner just said it had a SBC. I found some rebuild paperwork from 1997 that states its a 265. But who knows if its been swapped since then.

GASoline71 · 11-19-2015, 11:50 PM

Get the casting number off of the back of the block. Also along with the suffix code off of the machined pad in front of the passenger side cylinder head. Then you'll know what block you have.

I don't think the 265 came in any 1960's trucks... but I could be wrong.

Gary

geezer#99 · 11-20-2015, 12:25 AM

You would be right Gary!!
Besides the fact that a 265 doesn't have any side mounts.
That's one of the ways to tell what it is.
An easy way is find the casting numbers or suffix codes to narrow it down.
Look here.
http://www.mortec.com/

Cypher · 11-20-2015, 01:07 AM

Where exactly on the back of the block are the
numbers located?

**Captainfab** · 11-20-2015, 01:24 AM

In addition to the block numbers, you should also get the casting numbers from the heads. The spark plugs need to be correct for the particular heads being used.

The block casting numbers are on the drivers side.

Cypher · 11-20-2015, 01:27 AM

These are numbers located behind the carb, infront of coil. 3877652 GM20
What are those. To get casting numbers, will I need to go under the truck?

Marv D · 11-20-2015, 09:11 AM

3877652 is the casting # of the INTAKE MANIFOLD. The # that is going to tell you what heads (and what plug you need) is under the rocker cover.

OK link didnt work so,,,

Here will show you where to look

http://www.mortec.com/location.htm

geezer#99 · 11-20-2015, 09:19 AM

Quote:

Originally Posted by Cypher

Where exactly on the back of the block are the
numbers located?

If you looked on the link, you'd find this---
http://www.mortec.com/location.htm

Cypher · 11-24-2015, 11:26 PM

So I final found the numbers facing upwards tucked in

. GM 3849852 which comes out to be a 283 57-66. How do I found out if its original to the truck?

GASoline71 · 11-25-2015, 01:53 PM

Good chance it is. But after 50 years... who knows what it could have come from.

"Numbers matching" only counts with Corvettes and low production cars with special engine packages.

Gary

Cypher · 11-26-2015, 04:23 PM

Well, I guess I have to take the previous owners word and say that it was the factory V8.

Thanks for the help guys. Much appreciated.

11-19-2015, 10:50 PM	#1
Cypher Registered User Join Date: Jul 2015 Location: Arleta Ca. Posts: 44	265, 283 and 327 spark plugs Do they all use different spark plugs? I bought a 1964 chevy c10 and previous owner just said it had a SBC. I found some rebuild paperwork from 1997 that states its a 265. But who knows if its been swapped since then.

11-20-2015, 12:25 AM	#3
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,787	Re: 265, 283 and 327 spark plugs You would be right Gary!! Besides the fact that a 265 doesn't have any side mounts. That's one of the ways to tell what it is. An easy way is find the casting numbers or suffix codes to narrow it down. Look here. http://www.mortec.com/

11-20-2015, 01:07 AM	#4
Cypher Registered User Join Date: Jul 2015 Location: Arleta Ca. Posts: 44	Re: 265, 283 and 327 spark plugs Where exactly on the back of the block are the numbers located?

11-20-2015, 01:24 AM	#5
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,254	Re: 265, 283 and 327 spark plugs In addition to the block numbers, you should also get the casting numbers from the heads. The spark plugs need to be correct for the particular heads being used. The block casting numbers are on the drivers side. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

11-20-2015, 01:27 AM	#6
Cypher Registered User Join Date: Jul 2015 Location: Arleta Ca. Posts: 44	Re: 265, 283 and 327 spark plugs These are numbers located behind the carb, infront of coil. 3877652 GM20 What are those. To get casting numbers, will I need to go under the truck?

11-20-2015, 09:11 AM	#7
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: 265, 283 and 327 spark plugs 3877652 is the casting # of the INTAKE MANIFOLD. The # that is going to tell you what heads (and what plug you need) is under the rocker cover. OK link didnt work so,,, Here will show you where to look http://www.mortec.com/location.htm __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral. Last edited by Marv D; 11-20-2015 at 09:17 AM.

11-24-2015, 11:26 PM	#9
Cypher Registered User Join Date: Jul 2015 Location: Arleta Ca. Posts: 44	Re: 265, 283 and 327 spark plugs So I final found the numbers facing upwards tucked in. GM 3849852 which comes out to be a 283 57-66. How do I found out if its original to the truck?

11-26-2015, 04:23 PM	#11
Cypher Registered User Join Date: Jul 2015 Location: Arleta Ca. Posts: 44	Re: 265, 283 and 327 spark plugs Well, I guess I have to take the previous owners word and say that it was the factory V8. Thanks for the help guys. Much appreciated.



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