1972 Demon 340 engine mods
Those pistons will work fine if no detonation
what cam did you end up with again- it's been so long I forget
and compression?
lucky that chain did not skip some teeth and cause real problems
if nylon and portions of teeth missing you may want to clean your oil pump screen
cheers
Yes the chain could have skipped, but nothing missing aside of wear and tretched chain.
Compression is minimum 9.5:1 I would need to check my notes but 9.7:1 number seems correct to me. It was fluid checked when motor was apart.
As for cam we went with Howards mechanical flat tappet
Duration at 050 inch Lift: 238 int./238 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.558 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.558 in.
Lobe Separation (degrees): 108
With 1.6 ratio rockers we have 0.595 in. lift which takes advantage of that flow of 285 cfm at .550 and 288cfm at .600 lift.
There is no detonation, just in case he uses premium gas in it.
For carb we have 850 cfm double pumper that was setup using o2 sensor. The plugs look really good so A/F mixture must be pretty good also.
I ordered light springs for the distributor. Will see how it changes the car under 3000 rpm.
I am also thinking that perhaps air gap intake would be better then victor that is on it right now. This could be next thing on the list of stuff to buy...
