Spark Plug Problem
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,387
Likes: 123
From: CA.
Spark Plug Problem
IM TRING TO CHANGE PLUGS ON 72 454. OLD ONES WERE R44XL WHICH HAVE A LONGER THREAD. car calls for a r44t. problem is the threads with the r44t dont reach threads in block because threads start about an quarter inch in head. does this mean this car has wrong heads? and what plug will work/ i cant find what i took out anywhere.
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
That is a new one-- I ran the R44XL number on sparkplugs.com
http://www.sparkplugs.com/results_cr...CrossWarning=1
http://www.sparkplugs.com/results_cr...CrossWarning=1
Advanced
Joined: Jan 2008
Posts: 58
Likes: 0
From: Greenville Oh
Advance Auto Parts shows they have the R44XL plug http://www.partsamerica.com/ProductD...rtNumber=R44XL
They list a store at 640 Luzerne St in Scranton. I deal with them here and they are great to work with.
They list a store at 640 Luzerne St in Scranton. I deal with them here and they are great to work with.
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,387
Likes: 123
From: CA.
this is correct . i found out my heads are probably from a 68. any idea why someone would change heads? also does this mean loss or gain in performance?
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
396/427 Heads on a 454
The combustion chamber is smaller {closed} than the 454`s which is open. Yes as long as its been run before and obviously has been run this way the compression will be higher. Not really a bad move for some cheap HP by merely using a early 396/427 head
