articz28
10-04-2009, 10:43 AM
got a freind with a 355 SBC, dart pro V1 heads 64cc, 10-1 comp, Comp XE cam with around 513int, 523exh. Want to run a 150-200 shot and need to know what plug to run
Small Block & Big Block Chevy Specific - what plug
View Full Version : what plug
ZONES89RS
10-04-2009, 11:53 AM
Just get the coldest NGK he can find. THey are a great plug.
AutoRoc
10-04-2009, 09:10 PM
739-R5671A-7 This is a 7 heat range, the -8 is an 8, the -9 is a 9 and so on. Higher the number, the colder it burns.
I use this head with 11.5:1 comp, race gas, and a -7 NGK. 200hp jetting and it's great. Will it work with pump gas? Probably but I like to keep it way over on the safe side of things.
On motor, he could run NGK's FR5 plug. I might be ok to use with a 150 shot if you can't get the -7 stuff but I like to reccomend the non-projected tip plugs(like the -7 thru -11) for nitrous. It's what the big boys swear by.
The COLDEST plug they make is a -11... it's what you would use in a 2500hp 5 stage nitrous Pro Mod setup. Might not work so well in a 10:1 355.
Goodluck!
I use this head with 11.5:1 comp, race gas, and a -7 NGK. 200hp jetting and it's great. Will it work with pump gas? Probably but I like to keep it way over on the safe side of things.
On motor, he could run NGK's FR5 plug. I might be ok to use with a 150 shot if you can't get the -7 stuff but I like to reccomend the non-projected tip plugs(like the -7 thru -11) for nitrous. It's what the big boys swear by.
The COLDEST plug they make is a -11... it's what you would use in a 2500hp 5 stage nitrous Pro Mod setup. Might not work so well in a 10:1 355.
Goodluck!
1 FMF
10-05-2009, 10:58 AM
http://ngkaz.home.att.net/wsb/html/view.cgi-home.html-.html
download the excel matrix, has cross reference of everything,
will make it easier when you go to the parts store, you can give them the plug stock #.
download the excel matrix, has cross reference of everything,
will make it easier when you go to the parts store, you can give them the plug stock #.