autolite plug ?

Is the AR3934's to hot for a 100 shot ? this is on my cobra 2 with a 86 stock short block 302 and the jegs/kaase heads with a comp 292 magnum flat hyd cam.

whats the compression ?

nuclearcobra wrote:Is the AR3934's to hot for a 100 shot ? this is on my cobra 2 with a 86 stock short block 302 and the jegs/kaase heads with a comp 292 magnum flat hyd cam.

Not in my opinion. When you start spraying more the 1st thing to do is reduce the ign. timing when the spray is on .

we ran that exact plug with our 775hp (dynoed NA) sbf with victor heads hitting it with a 200 shot.

i personaly prefer the ngk's a little more forgiving if something is not quite right

Champion...............

champions ant shit gota get some ACs

studly wrote:i personaly prefer the ngk's a little more forgiving if something is not quite right

we run ngk's in our turbo car and our old motor in NA form but any time we sprayed it we had better luck with the autolites. we run the R5671A-10 in the turbo ride and we ran the -8 NA.

bruno wrote:whats the compression ?

Its around 10.5to1 its a 86 shortblock from a lincoln Lsc and the factory heads had 69cc chambers and these kaase heads have 60cc. the pistons are flattops with no valves reliefs and a very slight dish to them. I did a compression test and it had 155lbs pressure and the cam is 244@.050-534 lift.

Thanks guys i'll be spraying it this sunday hopeing for hi 10's, i bracket raced it for over 8 years with the spray a 150 shot was the most i tryed running 10.80's untill i brought the yellow 84 home from Missouri and stuffed a 472 in it and fell in love and let the cobra 2 sit for over a year due to a cracked block then i put a new 306 motor toghether over a year ago got her fired up two weeks before thanksgiving and blew it to pieces a week before christmas from running it down the track with a ice cold oilpan and let it sit for another year then i took the kaase heads out of the spare bedroom i had new for 6 years now and put it on the last complete motor i had laying around.

I run a 557ci with ported trickflow new style Aheads at 14.5:1 with 820lift roller with a AR3933 hitting around 175 shot.

whatbumper wrote:

studly wrote:i personaly prefer the ngk's a little more forgiving if something is not quite right

we run ngk's in our turbo car and our old motor in NA form but any time we sprayed it we had better luck with the autolites. we run the R5671A-10 in the turbo ride and we ran the -8 NA.

I guess I forgot to say that the R5671A-8 were the cross reference to the AR3934 plug. On NGK's the higher the number after the dash the colder the plug.