Just decided to post the sound of these puppies idling. They have that typical straight through sound, with a sound level of 83db at idle, measured 25 inches away from the tailpipes ( recorded on google pixel 3 XL, sound meter app). They drone at cruise but not as bad as the 40s I had. Those were good times though. The car sounded pretty rowdy at 750rpm, but the T-slots were completely covered (also maxed out on secondary adjustment).
'69 340
-x-heads 2.02/1.6 valves
-Keith Black hyper pistons
-purple shaft 284/484
TTI headers + H-pipe + tailpipe (2.5in)
- Flowmaster Flowfx straight through muffler (2.5)
-LD340 manifold
-Holley Brawler 750DP (stock specs but 3.5pv)
-msd 6al
-msd e-curve distributor (14/34, all in 2500).
-autolite 65 (.044 gap)
-idle speed : 900rpm
-sound DB at idle, 25 inches away from
-tailpipe: 83db
