393W Stroker with Boost - Need Spark Plug Recommendations

387lx

Member
Jan 22, 2026
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United States
Looking for spark plug recommendations for my 393w build, calculator said it should be around 10.5:1 compression with performer rpm heads and a vsr7875 turbo planning on only running around 6psi for now on pump 92. Want to do everything I can to reduce the chance of detonation since the motor has hyper pistons in it. Was looking at the ngk br7es. Just curious if anyone has experience with those plugs or any recommendations for other non resistor style non projecting plugs that will fit those heads?
 
From the website.

Installation Notes:

EQUIPPED WITH SPRINGS FOR USE IN HYDRAULIC FLAT TAPPET CAMSHAFT APPLICATIONS
High-flow 2.02" intake valves work with pistons notched for valve clearance
Hardened pushrods required, use Edelbrock #9632 (flat tappet only).
Will not accept rail rockers.
289-302 V8s require Head Bolt Bushings #9680 and either Head Bolt Kit #8552 (7/16") or stock head bolts. Match with Edelbrock head gasket sets.
Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
Designed for non-emissions 289, 302, and 351-Windsor Ford engines


Equivalents:

Autolite 3924 (very common street/performance choice)
NGK BKR5E (roughly equivalent heat range)
One heat range colder for boost/nitrous applications
 
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