Pro Stock John

iTrader: (34)

Part #?

Mightymousy?

danimal95

iTrader: (2)

TR8's are already in your car John

V6 Bird

iTrader: (15)

Where do you guys buy these Tr8's? Everytime I look them up at the local parts store they cant find it them...
































Thats because they dont make them! NGK R5671A-8's No where on the box does it say TR8

MIGHTYMOUSE

iTrader: (59)

NGK 7173 i have posted a photo of it before

it is the cross reference for an autolite ar 3911 exept with a full tip for longer life

you will definitely mess up the plug threads if you jam an acorn seat plug in an all pro head.

danimal95

iTrader: (2)

you would be correct,lucky for me the plugs are just started be hand and no tightened yet thanks

danimal95

iTrader: (2)

is that the correct part # for a plug with a similar heat range to a TR8??

MIGHTYMOUSE

iTrader: (59)

i know it is colder than a tr-6, but i didnt get that far into it.

V6 Bird

iTrader: (15)

http://www.ngk.com/more_info.asp?AAIA=&pid=3252

http://www.ngk.com/results_cross.asp?pid=TR6&x=0&y=0

the top part number says nothing about TR anything in it...is there something we are missing here

Pro Stock John

iTrader: (34)

Bringing this one back up.... Dave you mostly running 7173's right now? Are you running gasketed plugs for your AllPro heads?

MIGHTYMOUSE

iTrader: (59)

7173 is whats still in the car, they are gasketed, they are a cross reference to an AR-3911 but with a full tip (last much longer, normal life plug), all pro's do not have a taper seat

Pro Stock John

iTrader: (34)

Thanks Dave. What did you gap yours at? I've got a full set of 3911's around, but only a half set of 7173's. I hope to make a few passes pretty soon.

MIGHTYMOUSE

iTrader: (59)

the 3911's will lose the tip fast and gap open, this was a problem for me in a street car applicatioin, but if they are new they will perform as good as the 7173

i used them as gapped from the factory at .030 or 35 i think

Pro Stock John

iTrader: (34)

Thanks been a while since I tinkered with the Formy. I'm spacing out (maybe lack of sleep due to new baby), but what was the concensus around the AllPro heads, we need a gasketed plug since the plugs are more recessed?

MIGHTYMOUSE

iTrader: (59)

because the heads are not machined to accept a tapered seat (normal style) plug
if you try a standard style plug you fill f up the first few threads into the head

Pro Stock John

iTrader: (34)

Dave you street drive on these? How long you get before you need to change them? Just curious?

black98ws6ta

iTrader: (77)

I am also interested in the correct plug for a standard head in a 7-8 heat range. I had zero problems with tr6's at 900 rwhp but im guessing colder is safer.

Websy21

iTrader: (34)

Curious as well I am going with the TR-7's, whatever part number they are??? Don't have them infront of me, I think they're the one's you guys are talking about, I hope

Pro Stock John

iTrader: (34)

This thread was for the AllPro heads, since they are machined a little different and so require a gasketed spark plug.

MIGHTYMOUSE

iTrader: (59)

yes this is the plug that stays in the car full time. i have not worn out a set yet, but i have replaced them when doing head gaskets etc. just for good measure.

they will last as long as any other normal car spark plug would. they are not a racing fancy tip short life type of plug.

Pro Stock John

iTrader: (34)

These ones right Dave?

http://store.summitracing.com/partde...5&autoview=sku