This may have been asked before, but I'm curious and have an example to go by.
My 64 EC has a ZZ3 with Hooker Super Comp headers, Torque Tech 2.5" pipes going through Super Dynomax "hemi" mufflers and exit about 10" short of the rear bumper. It sounds great. Nice and has a low rumble at cruise and loud enough at full acceleration, but never "slappy".
On the otherhand,
my 79 Blazer w/350, stock manifolds, Hooker mandrel bent 2.25" pipes going through the same style "Hemi" Super Dynomax mufflers and tailpipes. But it had a "slappy" sound without catalytic converters installed and much better but still kind of "slappy" after I installed free flowing Cats.
Why is one slappy and the other real smooth?
My guess is the headers 1st and maybe the cam profile 2nd. The Blazer camshaft is stock.
Any ideas?
PS, for you younger guys or folks that refer to it in different terms.
Slappy=the sound you get slapping two wooden planks together real fast, or the sound a 65 289 Mustang makes with Glass-paks.
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Long time Chevelle fan and an owner since 1973
My 64 EC has a ZZ3 with Hooker Super Comp headers, Torque Tech 2.5" pipes going through Super Dynomax "hemi" mufflers and exit about 10" short of the rear bumper. It sounds great. Nice and has a low rumble at cruise and loud enough at full acceleration, but never "slappy".
On the otherhand,
my 79 Blazer w/350, stock manifolds, Hooker mandrel bent 2.25" pipes going through the same style "Hemi" Super Dynomax mufflers and tailpipes. But it had a "slappy" sound without catalytic converters installed and much better but still kind of "slappy" after I installed free flowing Cats.
Why is one slappy and the other real smooth?
My guess is the headers 1st and maybe the cam profile 2nd. The Blazer camshaft is stock.
Any ideas?
PS, for you younger guys or folks that refer to it in different terms.
Slappy=the sound you get slapping two wooden planks together real fast, or the sound a 65 289 Mustang makes with Glass-paks.


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Long time Chevelle fan and an owner since 1973