lookingaround

what would cause my valves to rattle? its a 406 dome motor with brodix track1's 645 solid roller cam that was degreed in. 1.5 harland sharp roller rockers msd distributor msd 6al box msd coil 750 aed double pumper. no matter where i move the distributor the valves rattle. will cheap gas cause this? i havent set the timming with a light yet just by ear to get it going. any help would be appreciated. thanks Avery

Tod74

Mild DETONATION MAKES A RATTLE SOUND...spark knock whatever you want to call it.

lookingaround

what causes that? how do i fix it? lol

hammertime

Lack of octane, I get it once in awhile with 87 octane on the primer plus :lol:

lookingaround

thanks David

hammertime

what fuel you running ?

lookingaround

right now its just 87 octane. i just got it going and that all they had around here. everybody was running out of gas.

hammertime

Id just it up next time should fix it.

zipper06

Add a couple bottles of Heet it will raise the octane by 2 to 4 points since it's almost pure alcohol. That will tell you if you have an octane problem.

JMO

Zip.

lookingaround

where can you get it at zipper?