Which Spark Plugs for a Crate 402 Stroker?

[67gtx]

Which plugs are you using in your 402 stroker? My next step in the build.

 

[dartswinger84]

Blueprint engines recommends for 408, with magnum heads: Champion 792, .045" spark plug gap.

BPC4080CT/CTC
750 Vac. Secondaries
Champion 792
.045"
360 Mag Weighted 7.25" Dia.
Weighted 360 (Pre Magnum)**
BPC4081CT/CTC/CTF*
825 Mech. Secondaries
Champion 792
.045"
360 Mag Weighted 7.25" Dia.
Weighted 360 (Pre Magnum)**

 

[ocdart]

Blueprint engines recommends for 408, with magnum heads: Champion 792, .045" spark plug gap.

I'd use the Autolite equivalent (AR3910) instead. I've run nothing but Autolite plugs for years. Couldn't get a Champion plug to live in my built 340 years ago. Autolite plugs both lived and performed.
Autolite Racing plugs all have oversized ground electrodes for better heat transfer. A cut back ground electrode reduces bridging (carbon fouling between ground electrode and center electrode) and ground electrode shadowing. Copper core aids in cooling and improves resistance to fouling. Power tip or extended electrode plugs project the firing tip into the combustion chamber which not only aids in cooling but also cleaning so that fouling is reduced at low RPM.

 

[stroked 340]

I'll second the Autolites..and with the negative comments i've seen on here and other sites about Blueprint engines the last thing i'd do or use is anything they recommend..