which spark plug suitable for my engine
 

Hi
I need help in choosing suitable spark plug for my engine
The specification for my engine as following
SBC 383 with 10.8:1 CR
AFR cylinder head 210(AFR-1054)
Solid roller camshaft (LUN-60132) with 1.6 rocker arm
Advertised Duration 273 int./279 exh
Valve Lift with Factory Rocker Arm Ratio 0.578 int./0.585 exh

I might get roasted for some of this, but here is what I have used/learned- many views on spark plugs here. (Kinda like valve lash threads here)...LOL

Here are few I remember: AC R45TS I think "TS" is tapered seat "R" is flat. This is a stock SBC plug.

NGK: BKR5E stock; the lower the number, the hotter the plug.

Bosch: F6DSR again stock.

not sure about hot/cold on your application due to set up; spray/no spray etc...

I use Bosch Platinum in my BBC... Why?? Ever try to start high comp motor in the winter w/ no choke? Fouled many over the years... I have noticed that platinum's are pretty hard to foul... & if they do, they will work the next day after dying out. JMO.

I like scooters recommendations, any of those will be fine for your combo, but to add to it if I may.

If you plan on using a ignition box like a MSD 6AL or equivalent, tighten the plug gaps up a bit.

I like > .028 - 032 :wink:

We use NGK R5672A-8 and gap to .040