CRATE 502/502: WHICH SPARKPLUGS?
09-27-2001, 10:30 AM
#1
Safety Car
Thread Starter
Member Since: Mar 1999
Location: VASS, NC, USA
Posts: 3,715
Likes: 0
Received 0 Likes
on
0 Posts
CRATE 502/502: WHICH SPARKPLUGS?
INSTRUCTION SHEET SAYS #4 DELCO RAPID FIRES (LARGE GEAD), WEBSITE SAYS R43XLS (LARGE HEAD), PARTS STORE SAY GO WITH 454 PLUGS (WHICH HAVE THE SMALL HEAD) WHILE THEY WILL ALL FIT, SOME HAVE LARGE OR SMALL HEAD, SOME HAVE DIFFERENT REACH
I HAVE THE R43XLS. GOOD TO GO?
I HAVE THE R43XLS. GOOD TO GO?
09-27-2001, 11:13 AM
#2
Race Director
Re: CRATE 502/502: WHICH SPARKPLUGS? (MELVIN)
Melvin,
Don't know what you mean by 'large head'? There are a few factors determining spark plugs:
Gasket or taper seat. The aluminum heads you have take gaskets.
Long or short reach. Aluminum heads use long reach.
Projected tip or regular tip. With flat top pistons, use projected for better burn.
Heat range. I have found an aluminum head big-block likes rather cold plugs.
I'm running AC Delco FR2LS, which is gasket seat, long reach, projected tip in heat range 2 (cold). My heads are the edelbrock aluminums, basically identical to your 502/502 heads.
Not sure exactly what the difference is to the R43XLS, but if they are gasket, long reach and projected tip they should work fine. Heat range (3) is good.
Don't know what you mean by 'large head'? There are a few factors determining spark plugs:
Gasket or taper seat. The aluminum heads you have take gaskets.
Long or short reach. Aluminum heads use long reach.
Projected tip or regular tip. With flat top pistons, use projected for better burn.
Heat range. I have found an aluminum head big-block likes rather cold plugs.
I'm running AC Delco FR2LS, which is gasket seat, long reach, projected tip in heat range 2 (cold). My heads are the edelbrock aluminums, basically identical to your 502/502 heads.
Not sure exactly what the difference is to the R43XLS, but if they are gasket, long reach and projected tip they should work fine. Heat range (3) is good.
09-27-2001, 11:21 AM
#3
Safety Car
Thread Starter
Member Since: Mar 1999
Location: VASS, NC, USA
Posts: 3,715
Likes: 0
Received 0 Likes
on
0 Posts
Re: CRATE 502/502: WHICH SPARKPLUGS? (zwede)
By large and small head spark plugs, I meant the size socket that is used. The large head takes a 7/8" socket, and Im not sure which size the small does. I wasnt sure of the correct terminology.
Im thinking the R43XLS are correct ones?
Im thinking the R43XLS are correct ones?
09-27-2001, 11:23 AM
#4
Le Mans Master
Re: CRATE 502/502: WHICH SPARKPLUGS? (MELVIN)
Yeah, they should be fine, although I find 'em a little cold for the street.
I'm running R44XLS on my GM heads and they look great.
09-27-2001, 07:00 PM
#5
Safety Car
Member Since: Nov 1999
Location: Paducah KY
Posts: 4,466
Likes: 0
Received 0 Likes
on
0 Posts
Cruise-In I Veteran
Cruise-In II Veteran
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '03
Re: CRATE 502/502: WHICH SPARKPLUGS? (MELVIN)
The engine comes stock with ACDelco #4, part number 25164642. Recommended gap is .035"
09-28-2001, 08:45 AM
#6
Re: CRATE 502/502: WHICH SPARKPLUGS? (MELVIN)
Melvin,
I kept fouling out #1 & #3 plug with the rapid fire 4's, so I switched to R43XLS----runs fine ........
:chevy
I kept fouling out #1 & #3 plug with the rapid fire 4's, so I switched to R43XLS----runs fine ........
INSTRUCTION SHEET SAYS #4 DELCO RAPID FIRES (LARGE GEAD), WEBSITE SAYS R43XLS (LARGE HEAD), PARTS STORE SAY GO WITH 454 PLUGS (WHICH HAVE THE SMALL HEAD) WHILE THEY WILL ALL FIT, SOME HAVE LARGE OR SMALL HEAD, SOME HAVE DIFFERENT REACH
I HAVE THE R43XLS. GOOD TO GO?
I HAVE THE R43XLS. GOOD TO GO?
05-23-2016, 02:51 PM
#7
1st Gear
Member Since: May 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Any new shiny plug is going to run fine for a while. Its after they get fouled a little and have a harder time cleaning up. Seems to me the hot ticket is to order Rapid Fire 5s
