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393W Stroker with Boost - Need Spark Plug Recommendations

  • Thread starter Thread starter 387lx
  • Start date Start date Apr 29, 2026
3

387lx

Member
Jan 22, 2026
25
2
11
United States
Apr 29, 2026
#1
  • Apr 29, 2026
  • #1
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?
 

AeroCoupe

lube between the nut and the face. I know my lubes
Founding Member
Oct 28, 2001
5,804
3,940
183
Claremore, OK
Apr 30, 2026
#2
  • Apr 30, 2026
  • #2
Fixed your thread title so you will get more replies from the folks with hair dryers.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
42,933
21,110
234
Box behind Walmart
Apr 30, 2026
#3
  • Apr 30, 2026
  • #3
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
 
Reactions: DadLife0724

HotFox

15 Year Member
Jan 5, 2009
1,047
647
164
SE Michigan
Apr 30, 2026
#4
  • Apr 30, 2026
  • #4
NGK tech line will get you in the ball park. Built numerous engines with different compression ratios. Yet to steer me wrong.
 
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