I just bought a 2.0 '74 with D-Jet (now I have two!! ). The PO had taken the exhaust and HEs off the car. I want to drive the car on my driveway (1/4 long), get it good and warmed up and check the motor (leak down, compression). Can I run without HEs? Will it damage anything? If not, can I use the stub pipes that the '75/76 cars used? I have a set of these.

Without stub pipes I'd guess you will damage the exhaust ports.
With stub pipes it would still be extremely noisy, and probably not run correctly (no back pressure etc).
I would not do it myself.

just don't ... you'll have 15" flames shooting out of the heads and it'll be as loud as a jackhammer right next to your ear ...
Andy

Don't forget even with the stubs on there, they are probably too short and will allow too much cold air to rush back in after you shut the engine off which can damage valves and or seats by cooling them off so fast.

not to mention the fact that the stub pipes aim forward....hmmm melting undercoating???

Cevan, I have two old HE's with beat flanges....yours for the taking free...just come and get em.

Rich

Thanks for the offer. I have the stub pipes and HEs that came with my other car I could use.

Have you done anything with the Dephi green chassis??