Have just bought some racing type spark plugs for my classic impreza turbo but compared to the pfr7b plugs the overall length of threads/tip is shorter. Will this effect anything?
See attached pictures.
cheers

 

I would check with whoever you bought them from that they have supplied the correct plugs as im sure you could do a bit of damage with the incorrectly installed ones fitted

 

They look ok to me, If your worried grab a feeler guage and check the gap The threaded section only looks longer on your new plug as the old plugs washer is crushed

 

be carefull geting raceing plugs mate i bought a set of densos fitted them an had to get a new knock sensor because it blew it spent 60 quid took them out an put bosch ones back in then had to pay for the sensor

 

What number are the new ones??

 

Pretty sure the plug number for classic racing 8s is 3474-8

 

Will check numbers on boxes tomorrow.

 

You are correct about the washer and threads are same length, mainly tip part different length. I gapped them to 0.7 picture was then taken. Car runs and drives fine just curious for long term effect and at £30 each I want to be 100% sure are good.

 

look fine to me. as above the new one has crush washer not crushed.

 

got some iridium plugs in mine too nothing bad to report and they over 2yr old now.

 

They are ngk racing competion R7434-8.
Does this sound correct?
cheers

 

Yes that is correct