Thread: What pulley and plugs to get??

Originally Posted by Going Too Phast

Well it is helpful to understand the Autolite heat ranges.

606 = Stock
605 = 1 step colder and good for stock motors to ~3.5 pulley
104 = 2 steps colder and good for 3.4 to 3.2ish
103 = 3 steps colder and good for 3.1 to farther than I'll ever go

If the plugs are too cold, the plugs don't get hot enough to burn deposits off of them which will lead to misfires as they accumulate. The recommendation usually is to run the hottest plugs you can safely get away with. So your best bet is 605s. If you have one or two degrees of KR with the 605s, you could try 104s. But you can see that 103s are for more hardcore setups.

EDIT: And I always like referring to Overkill's spark plug article.
Ontario Quebec Club Grand Prix :: Which Spark Plugs Should I Run?
That will feed your need for information.

you got a time on that car with those mods in your sig??

let us know for sure!!


hey before i start a new thread this is where im at...i want yalls opinion on something....

i am trying to decide between headers and a p-log with probably a stock rear manifold maybe ported in the future....


my goal for the car???....hmmm i guess i would be ok with 13.5 .....possible with a p-log and maybe a ported rear? with supporting mods maybe??


i dont want to go into the motor really or change any stock exhaust after the downpipe...these are the mods i would not mind doing in the future....intercooler....rockers....ported lim and sc...throttle body ect....i would like to keep the stock cam and heads and rear mani if possible...what do you think...possible??


my opinion is that it would not be worth the EXTRA 600 for headers...(i would want coated) and that that money would be spent better else where...

TIA I KNOW I CAN COUNT ON YA'LL FOR SOME HELP

Originally Posted by Going Too Phast

Do not get headers. With your goal, the plog/dp combo will be more than enough. Save that money for rockers and other mods. The rear PEM is not very important. If one falls into your lap for free, sure, but I certainly wouldn't pay $120 or whatever ZZP sells theirs for.

I'll quote from my favorite source for 3800 info, Overkill, about the exhuast:
"For mild-moderate setups, until you have a cam or run a 2.x" pulley size, the money saved by doing a Powerlog versus headers can go into modifications with bang for your buck."

And...
"A 2 1/2" downpipe with Powerlog will support bolt-on vehicles ideally. "

Your goals are basically the same as mine, except I am not going to do an intercooler.

ok cool that is what i was thinking considering basic engine knowledge and considering the times i wanted to run. just wanted some reassurance is all....

yea i would def. do it myself before i bought the rear pem from zzp...i have heard from somebody on one of these fourms that it is not worth it any way considering the difference between stock and ported.

yea you guys also helped me make the decision to keep the 2.5 downpipe also istead of returning it for the 3''...the thread is somewhere around here...


thanks for your input