67/68/69 cuda dilemma
Haters dont be hating. I got these 68-71 340 exhaust manifolds. The intake we will use has no heat crossover so a flapper is useless, plus we may eventually go EFI down the road. Drilled them with a 7/16" unibit drill, tapped with a 1/4" pipe tap, and put stainless pipe plugs in. This idea may also be a good way to repair damaged heat riser flap holes. Tap with a pipe tap, put brass pipe plugs in, then bore the pipe plugs back out to turn them into bushings for a new heat riser flap.
Haters dont be hating. I got these 68-71 340 exhaust manifolds. The intake we will use has no heat crossover so a flapper is useless, plus we may eventually go EFI down the road. Drilled them with a 7/16" unibit drill, tapped with a 1/4" pipe tap, and put stainless pipe plugs in. This idea may also be a good way to repair damaged heat riser flap holes. Tap with a pipe tap, put brass pipe plugs in, then bore the pipe plugs back out to turn them into bushings for a new heat riser flap.