Ok, I have a rebuilt 355, with a, like new holley 750 double pumper and a T56. How do it go about starting the motor. Do I try to get the timing close before start up? I though RIGHT when I fire up the motor I had to keep it at 2000-2500 rpm's for camshaft break in. How would I tune this carb so it runs right upon first start up. Is there anyone who can shed some light on this? I have dart iron eagle heads and a flat tappet camshaft w/ 242/242 w/ .50 lift int. and exh.

Zach

 

in my opinion and the way ive done it once the rar fires adjust your idle up watching the motor for leaks and such while setting timing an carb adjustments usaully i like to have a extra set of hands around if you need to shut her down make adjustments an start over dont overheat her and i always break um in at 1750 rpm ive never heard anything over 2000 good luck

 

usually 2000/2500/3000RPM is the spec, depends on who you talk to. Lunati told me 2500 for 20 minutes, then 1 minute at 2750, 1 at 3000, then a few more at 2500RPM then shut it down.
GM shows 30 minutes at 3000RPM.

Yes, just set the distributor up to say 20* advance on the #1 firing, pour some fuel into the carbs float bowl and fire it up. It *should* fire instantly. I've never had it happen that good, but hey maybe you're lucky

After you do whatever break in time you think is ok, drain the oil and change the filter. Then go bag on the motor to set the rings. engine braking and medium throttle 2000-5000RPM blasts are good for that.
that's a big cam I think, so take out the inner spring if you have it.

 

Go by what the cam manufacture recommends.

 

i agree go with what the company recomends watch the temp closely thou nothin worse then overheatin a new motor

 

Well, I guess this is more of a question of how i set up my carb. The carb I have was never ran on the car before. Do i get it in the ballpark before I fire it up for the first time? Can I tune it then break in the cam? The motor is brand new and the carb is rebuilt. I bought the carb a week ago. I guess the question is What is the procedure to get it running to break in the cam?

Zach

 

turn the adjustment all the way in then back out 2.5 turns then fine tune from there fine tuning adjust each obtaining highest rpm level then back off alittle working back and forth till highest rpm is obtained

 

https://www.thirdgen.org/forums/tech...er-engine.html

https://www.thirdgen.org/forums/tech...ard-break.html

There's about a couple dozen more floating around on the board.

 

See, I know that, but I was under the impression that once I turn the key and fire up the new motor, I need to break in the cam immediatley. So I would not be able to tune the carb before the break in procedure. I understand the break in procedure. I just don't understand how to get the carb set up that has never been ran on my car before. I'm confused.


zach

 

in the past i do this as im breaking in the cam tweaking the tune up i think your thinking your gonna be in the car holding the pedal if thats what your gonna do its a two person job believe me its a fast 30 mins and if you have close neighbors you might get a few nasty looks i love it

 

oh yes besides this several short run to get her running good enough to do this isnt going to hurt you probally have to set valves and little stuff like that i have never had any problems doing it this way i think you are thinkin as soon as you fire it up first time. what i normally do is turn the car over for about thirty secs adjust your rockers fire it up readjust the rockers put valve covers back on at this point you should know wheather it is running good enough to break in the cam

 

I set my valves already without the car running. So are you saying that I can start the car and set up my carb, then break in the cam?? I thought for some reason it had to be broken in right away.

Zach

 

As long as it starts and runs, you won't need to set up the carb to break it in. You won't be idling during break-in anyway.

 

exactly and if it dont fire then adjust and normally i set the timing before