Jrp1978

iTrader: (10)

For some reason ? ( just my luck ) i am sure! I am getting spark knock in 4th gear when i first hit the gas its doesnt show up , but I can here it! I am running alittle black smoke out the back !
Just thought a gentlemen on here told me to run .027 gap on my plugs bad idea!!!!!!!!!???????
I have not done it yet but just wanted to get more input 402 ms4 camshaft 11.6 compression . I think ( someone else might check math )
4.00 bore 4.125 stroke .. 64 cc heads flat tops with 2 cc reliefes

DaveX

Sounds like the tune might need a little tweaking.

Jrp1978

iTrader: (10)

so could the tune cause this ? i mean it must be rich with the black smoke pouring out!

DaveX

Yes. If it's actually pinging and it's not lean then it might just need a little less timing in that area.

Goldfinger911

iTrader: (24)

.027" plug gap? Unless your boosted, there is not reason to shrink the plug gap that much. You need a wideband and then need to log some data to see whats going on and where in the tune.

zapp168

iTrader: (7)

Why would you hear knock, but not have the sensors pick it up? Have they been de-sensetized? I thought the sensors picked up before your ears could?