P Paul Williams Supporter Jul 1, 2017 #1 Hi guys anyone know of a good performance plug to replace NGK BPR5FS on my 5.0 Ford engine in my 1991 GTD Cheers Paul
Hi guys anyone know of a good performance plug to replace NGK BPR5FS on my 5.0 Ford engine in my 1991 GTD Cheers Paul
F Fred/Belgium Jul 1, 2017 #2 Hi Paul, If yr engine is a short block SB302 , then use Autolite AR3934 (hotter) AR3933 (colder). I use them for years on street and track and they do fine. Grtz Fred
Hi Paul, If yr engine is a short block SB302 , then use Autolite AR3934 (hotter) AR3933 (colder). I use them for years on street and track and they do fine. Grtz Fred
J Steve Supporter Jul 1, 2017 #3 Agree with Fred. I use the AR3933 with 10.5:1 compression and pump gas. If you're using higher compression the AR3934 would be better.
Agree with Fred. I use the AR3933 with 10.5:1 compression and pump gas. If you're using higher compression the AR3934 would be better.
P Paul Williams Supporter Jul 1, 2017 #4 Thanks guys will have to get them from the states , another question the Threadreach: is 11.2mm on the NGK plugs the Autolite AR3934 are longer will this matter Last edited: Jul 1, 2017
Thanks guys will have to get them from the states , another question the Threadreach: is 11.2mm on the NGK plugs the Autolite AR3934 are longer will this matter
J Steve Supporter Jul 1, 2017 #5 Best to check with the manufacturer of your heads. Summit racing carries the autolites.
