Noobie with a 493cu

[ScottyG]

I got a 493cu
tf270s tf roller cam , HS 1:6 rockers
11.3:1
I got Holley terminator x efi system MPI

What spark plugs and what gap should I run on 93oct. Right now I got it at stock .035 and have autolites. I got it at 20* initial and 34 cruising and WOT at 30.
I know every engine will react different. Just trying to get some basic knowledge. Where other built engines like to run around at . Still tuning it and tweaking it.

 

[pnora]

Gap at .035 is fine. Read the plugs and adjust the heat range by the way they are burning. Forget about what someone else is running. Sounds like you are already in a decent tune.

 

[Geoff 2]

NGK '5' heat range.

 

[fourgearsavoy]

My 493 has a little over 12-1 compression with Indy EZ heads and I have been running NGK 7's and it runs really well. I set my base timing at 22 and total 34.

Gus

 

[451Mopar]

Nice setup there! On my 12.4:1 compression 499" low deck stroker I'm running the NGK heat range 7 spark plugs.

 

[not so famous bob]

I got a 493cu
tf270s tf roller cam , HS 1:6 rockers
11.3:1
I got Holley terminator x efi system MPI

What spark plugs and what gap should I run on 93oct. Right now I got it at stock .035 and have autolites. I got it at 20* initial and 34 cruising and WOT at 30.
I know every engine will react different. Just trying to get some basic knowledge. Where other built engines like to run around at . Still tuning it and tweaking it.

View attachment 1722531

you didn't say what ignition .
with a fast 2.0 , i run ngk 5`s in my 440/505 , ''M S D ign.'' , plugs gapped at .044 , locked dist. , fast controlling everything , more timing at wot....

 

[not so famous bob]

My 493 has a little over 12-1 compression with Indy EZ heads and I have been running NGK 7's and it runs really well. I set my base timing at 22 and total 34.

Gus

View attachment 1726720

I started with 7`s but don't have as much compression as you=5`s..., ditto on the 34 degrees..

 

[451Mopar]

I mentioned my 499" 12.4:1 compression Max Wedge head setup running heat range 7, which is a colder plug.
The more mild 505" 10.3:1 compression stealth headed engine has the hotter heat range 5 plugs. I usually just run a 0.040" gap.
On the 499" with 2" headers, I had problems burning plug wire boots so I finally bought some Accel 9000 ceramic boot plug wires.
The 499" was running a carb, and converted to the FiTech 1200 PA throttle body EFI, and running it with an old lean burn distributor.
The 505 was the old edelbrock XFI tunnel ram setup, but electronics converter to FAST 2.0