69GMC910, I dont think i would go bigger than 2 1/4" ex haust (duals) on your combo......too big & you loose all the low end tork that you really need on a heavy truck. Im runnin 2 1/2" on my longhorn behind an edelbrock rpm topped 383.......& thats plenty. You dont really need or want 3" pipe till you are in the 450 plus range on hp......
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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