Chev running on dyno no pipes

[hereinmissoula]

because with out a header tube to gradually let temperature inside cylinder cool you'll crack valves...... this can even happen with open headers vs. full exhaust in cold weather

[huey983]

@hereinmissoula not it wont what do u think smog pumps do! they inject cold air into the exhaust port

[Bruteforce72]

yeah thats good for it

[gmh265]

and its bad for it why?

[timbo3744]

why would it bad for it? thats what engines do is burn

[slayermd]

Cool!