Just wondering if these risers are ok as far as water reversion goes. They are for Bravo drives. 454s w/ 177 blowers and comp cams 274H cam. Its a 113 lobe seperation cam shaft. Exhaust tips have internal flappers. Dont want any problems.

they should be fine!.

if your not running silent choice and just for extra insurance you can have the center tube's extended..

how long can you safely extend the inner pipes without adding on to the outer pipe? I'm planning on using the same tails and I was planning on extending mine so I could fun a larger cam.

as far as you need to go! Ive never just extended just the inner pipe tho,always done both...i usually do it the same way cmi does theirs,the inned pipe is stop sign shaped and the inned tube is 1'' in from the outer pipe..

I'm using mine with the Formula Silent Thunder and I was thinking about extending the inner into the thunderbox to make it close to a dry set up... Think this would work?

[QUOTE=endeavour32;3088978]I'm using mine with the Formula Silent Thunder and I was thinking about extending the inner into the thunderbox to make it close to a dry set up... Think this would work?[/QUOT

YIKK'S you better drill a bunch of drainage holes in that silent thunder box..They hold a bunch of water...I removed mine for the fear of water going into my engine..

LOL, They do hold a bunch of water, and yes I'll be drilling out the bottom of it. I did that on my last Fomula and it worked well.

I can extend the inner at least a couple feet. will probably do this . thanks for the advice.