A) like your overall setupThis is what I have:
258 with 4.0 conversion performance 7120 head from Odessa cylinder head (ebay)
Comp cam 68-231-4 206/214 [email protected] 462/485 lift 111 degrees lobe separation
985 autolite plugs gapped at .035
4.0 stainless header with universal cat and Flowmaster Flowfx muffler 2.25 inch exhaust
Holley 2300 Sniper EFI in tank fuel pump, Hyperspark distributor, CD box
TF 999 auto, 4.10 gears, 35" tires
It defaults to 36 degrees total timing and I am set at 32 degrees at WOT. 15 degrees initial timing .
I have been running 93 Octane.
so while accelerating I have been getting spark knock/ pinging from the engine.Being that I have a hyperspark distributor everything is adjustable
Will adjusting the total timing down or the WOT timing get rid of the spark knock. What about a colder spark plug? IIt would be nice to run 87 octane also.
I don't know what the compression ratio of the engine is.
I will take any suggestions. View attachment 4172428 View attachment 4172428
B) EGR delete? Typically helps the cylinders run cooler
C) .035 plug gap seems a bit tight for your setup, maybe try .045
D) generally speaking for the 258, 15° sounds very advanced on the timing...is this what Holley recommends for their Sniper setup?
Sounds like your motor is "wound tight" and although built to handle it not designed to run quite that "hopped up"?
Just my $0.02, I'm sure others will chime in, especially those with more Sniper experience.