Ok I have a question for all u V8 (N/A guys) or anyone that knows lol

I was told by a buddy of mine if I just have the header on my new sbc 305 and no pipes or mufflers after them I can bend the valves in minutes.. is this true?

most likley I was planning on getting the truck, putting the header on putting the carb on and tuning the carb with just headers, then run it down to the muffler shop to get the exhaust done.. maybe drive it a little before I get the exhuast done.. what do u guys think will I be at risk ofbending valves if I do so?

the engine is out of a 86 monte carlo (from what I understand) sb 305 not built up un known mileage, will have a new 600cc 4bbl carb, sampson (I think) headers..

your opinions?

Dave