Originally Posted By 62SAVOY
Anybody use these style?

Dynatech Vortex Insert Cones

https://www.summitracing.com/parts/dtc-772-32520/overview/

Boss said he used to use these in his cars and worked good.

Have a set of those on the Camaro. It has a 14.5:1 436" sb chevy in it that has a nice cackle to it...those things took the edge off the idle to where it doesn't hurt your ears as bad. It did quieten it somewhat, but not a lot. They did not slow it down at all though.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax