I have a 86 RX7 and im installing my RB Headers and I dont have 1 bolt out of the 4 thats for the headers and i dont have 4 of the nuts, anybody know the sizes????? And do i need to buy a koyo radiator cap??or could i just get any type of radiator cap to fit it??

 

I just took one of the nuts to the parts store & matched up the threads.
I ended up using 3 studs & nuts with 1 bolt.

There is a quality difference in caps. I once had a Stant cap the blocked drawback from the overflow jug.

 

thanks man, i can finally wake up my 7 from sleeping for 6months

 

ANOTHER QUESTION:

are the o2 sensors on a S5 the same w/a S4??cuz i think i have to replace my o2 sensor on my s4

 

O2 sensors are all the same except the connectors.
The S4 and S5should be the same connector . The thread is the same with almost all O2 sensors. If the old one has many miles on it, get a universal one from Checkers. They're like $30 or so.

 

The O2 Sensors are Interchangable with the exception of the connector. Both series O2 Sensors have different Harness Plugs but either than that, they are essentially the same. It can easily be corrected by swapping the respective Harness Plugs.

Be sure to solder, heatshrink wrap and possibly wrap the connections with Electrical Tape, should you go follow this route.