Need spark plug recommendation
 

I am finishing a new engine build and need your recommendation for what spec spark plugs to run in the engine. Some information on build:

3 liter with
Stock heads and valve size
Aascomotorsports valve springs and retainers
Compression ratio 10.5 : 1
Elgin 306/288–102 cams
Twin plug
MSD AL6
S spec MFI

Thanks in advance for your responses

Cheers,
Dan

The 82/83 911SC Porsche Technical Specs book shows the WR3CC/WR3CP for the Euro engine.

Or the NGK BPR7ES

Need spark plug recommendation
 

Hi.

These two are what I have used on my twin plug 3.2 RSR Short Stroke with 10.3:1 CR:

Before: NGK BCP7ES
Now: NGK BKR7E V-Power

Both of these have the smaller Hex-head you will need for the lower plugs.

Cheers

Thanks for the recommendations!!

Street only?

Also 12mm lower plugs?

This Engine is going into a 914 that can be driven on the street but is 98% track animal.
No, 14 mm lower.
Cheers
Dan

With that compression use a cold plug as Porsche recommends.... for the 930-10 w/ 9.8-1 comp that equates to a NGK 7788 BPR 9 ES not the 7.

start with a cold plug.
especially for track .

hotter plugs are needed if you idle a lot, do a lot of city driving or if you have carbs,