AC R43S or AC R45S - Corvette Forums - Corvette Enthusiast Site


Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 06-13-2017, 02:11 PM
Junior Member
Thread Starter
 
Join Date: Jun 2017
Location: Phoenix, AZ
Posts: 6
Default AC R43S or AC R45S

I just bought a '57 with dual quads 245 hp engine (that runs a little rich) and 3 speed tranny.
The car has AC R43S spark plugs (installed by the previous owner) and the auto parts stores show that the right plug for this car is AC R45S.
I'm a little confused
Anybody have some advice?
Thanks in advance
Reply With Quote
  #2  
Old 06-14-2017, 10:14 PM
73shark's Avatar
Super Moderator
 
Join Date: Apr 2006
Location: KC, MO area
Posts: 2,295
Default

Not sure what the owner's manual might specify but a R45S is two steps hotter than the R43S. I know my '73 says a R45TS and I use a R46TS because it burns cleaner w/ mostly in town driving.

I'd try the 45S and see how it looks after a few hundred miles.
Reply With Quote
  #3  
Old 06-14-2017, 11:06 PM
Junior Member
Thread Starter
 
Join Date: Jun 2017
Location: Phoenix, AZ
Posts: 6
Thumbs up

Quote:
Originally Posted by 73shark View Post
Not sure what the owner's manual might specify but a R45S is two steps hotter than the R43S. I know my '73 says a R45TS and I use a R46TS because it burns cleaner w/ mostly in town driving.

I'd try the 45S and see how it looks after a few hundred miles.
Thanks for the advice 73shark!
Reply With Quote
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 09:01 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.