Hi there again thinking of getting new sparkplugs. Read some post about it and thought I just dubbelcheck here these ones are very good right ? : http://store.summitracing.com/partde...0&autoview=sku also getting edelbrock high-flo tpi with runners and edelbrock tes headers. with new holley adj. fuelpressure regulator (the one that can be changed by hand ) and some new MSD 90degree sparkplugwires and some other good stuff thoose sparkplugs will work good to that setup ?

I never tried em but i heard they work real good though but not with msd boxes, i use just regular delcos

Last time I used them was in a beretta, and 3 sets all fouled within 2000 miles, never had a problem with any other brand in the car

Is there any better AC Delco sparkplugs on the market then ?!
Dont have the Msd box,

but I have the MSD blaster coil, dual connector. does that matter ?

I mean for our cars the regular delcos work the best, you could go a step colder if you wanted to. I put NGK TR55's in my car and they work real good, they are a little shorter than the delcos to clear my headers. If i had manifolds id put the standard delcos in but probably a step colder plug. The standard gap for them is .035 but gap them to .040 definetly.

I don't use any delco plugs (working at a dealer we wrote a tsb on the s10's from the delco plugs)

Well these ones then R45TS - Ac Delco : http://store.summitracing.com/partde...5&autoview=sku

its the stock sparkplugs

that is all I use , all you need

Archemedes what is the reason you wont use them ? I have used them for 20+ years with no problem .

Yeah, I always used the R45TS in my IROCZ, no other brand then AC Delco spark plugs, just becuase these cars are really sensitive to other brands... dont know why but I know alot of peoples that tried other brands like champion, ngk and so.. didnt run clean and smooth, changed back to Delco and their car runned like a dream again...

Just thought that there was any better Ac delco plugs than 45TS..
will order 8 R45TS from summit later then

thanks alot

Well for one Platinum plugs are junk for our cars. Platinum of any plug wont work as well as good copper plugs because copper conducts electricity much better than platinum. The only plus side of platinum is they last longer but at the cost of performance. I have used NGK V power plugs and my car runs excellent and I know alot of other people on here use NGK and swear by them too. Stay away from platinum.

I will stay away from platinum then
Will go for the R45TS plugs

http://irocz.info.se/

when working at a dealership we had 20 s10s all in with cold miss, did all kinds of stuff, changed plugs to autolite, and it was fixed, sent the delco plugs off, and all were different heat ranges, the quality control is not very good

Maybe R44TS plugs then? Instead of R45TS, for one step colder maybe?

stick with what they call for, the heat range was all over the place (the issue may have been corrected by now also, this was just after GM sold delco so I assume suppliers have changed since then, just one of those after having a major issue with a brand you don't go back things)

Stick with Delco wires and plugs whenever you can.

I just looked my 87 GTA up. My F Engine Code (350 TPI-L98) calls for R43s, not 45s...

'8' code for 43s....
'H' code for 45s....
'S' code for 42s....

'87 L98 ACDelco Platinums #88901023 Delco 41H's
'87 L98 ACDelco Rapid Fire (Aluminum heads) #25171348 Delco 41R's
'87 L98 ACDelco Rapid Fire (cast iron heads) #19145283 Delco 41R's
'87 L98 ACDelco Standard plug #5613325