Recent content by jay27

I am not trying to undermine you here , just looking at your dist cap and the plug wire orientation , your firing order may be the issue unless I'm seeing things wrong. Backfiring while cranking can be several issues but most engines will still fire if timed correctly even with mechanical issues...

Torque converter bolts and or dust cover are my guess without more info. Is it solid or poly motor and trans mounts or still rubber?

There is not much info to go on , a mostly basic 340 will be fine with this cam with headers and a 750 and some head work would be an added bonus. I'm not sure what your induction set up is. Your usually fine with these small rollers (similar to Comps 288 street roller) but I would still get...

Is your 727 full of fluid?

If it's an actual out of balance vibration changing mounts will not help. If it's a random vibration and the car is buzzing while up and down in the rpm band at different frequencies then change the mounts. Start with the trans mount and let us know what you find, You have several variables so...

You eliminated the front accessories , swapped some other items , like cudamark mentioned in post #4 you should reinstall the rubber mounts , I would even try putting a rubber trans mount in to see if it changes something while in different RPM ranges. Good luck.

I would think the leak down would be worse with bent valves would it not? Are you running stock push rods? If so you said they are straight and not bent? Cant remember ever bending a valve and not bending a stock tube style push rod If your going to do a compression test pay attention to the...

What piston are you using? What compression ratio?

It's an old white box cam , there was a .465 224 @.50 and .480? 230@ .50 cam but dont remember the exact specs , it would have been lazy down low with what you had. You have a good base to start with , are you planning on a hydraulic , hyd roller , solid or solid roller cam in your rebuild?

Looks like someone ridge reamed the block and found some 1971 flat top pistons , don't see those often. Those markings on the cam (purple , red and white ) do not sound like a mopar cam , do you have a pic?

You will need to have the bores measured along with the pistons to know for sure.

Those are impressive numbers and I am confident you have your Demon working really well, what track did you achieve your best times? Just curious. I am going to go out on a limb and suggest any decent street engine in your car would result in some impressive #s as well compared to an average...

Are you contributing or just going deflect everything off course? Why does he only run 28 degrees of timing? Why , Why , Why? Please explain why , you do know the answer right? I would sure like to hear it and please be factual.

That sure is an eye opener , thanks for sharing your findings.