jims2000lt

How do I choose the right spark plug for my new build?
First list is the changes I've made;
4.25 stroke Eagle rotating kit. 11 to 1 SRP flat top pistons. .Balanced
3' X-pipe exhaust.
New Edelbrock replacement valve springs.
Had heads cleaned and checked.
Block was bored to .60 over, half filled with hard blok, honed with plates, 0 decked.
7551 RPM Performer on its way. (backordered)

This list is what is the same.
2" Hooker super comps.
1" Moroso open center carb spacer.
Lunati Hyd Flat tappet cam. I have to look up the specs.
880-890 CFM 4150 Holley.
HEI Dist.
My big change from the old to new is the bump in compression and the straight & square maghine work.

I just need to find a chart or something for the plugs to get me close.
Thanks to all who reply.

oldcutlass

I'd start with the stock plugs and check them after running them for a while. Gap to .045. Then adjust if necessary.

cutlassefi

For a performance application always use the coolest plug you can before it fouls.

Smitty275

Street or strip. Aluminum heads correct?

jims2000lt

Street miles per season is usually under 2000. Hope to make a few Olds events and local test and tunes this year.
Edelbrock aluminum heads. Mildly ported and polished by me a few years ago, nothing crazy.

Smitty275

I would start with an Auto Light AR3911.

jims2000lt

The answer I was hoping for. Thank you sir.
I've always used Auto Lights or AC Delcos.

ds00469

I have been using E3 spark plugs. part number ETP-E3-52 on summitracing