351w running much better

[Roger Bray]

Hey Guys,
My 351 crate ( holley 750cfm ) was running a little rough and was hard to start, so I have been doing some investigating.


I'm starting with the assumption that the carb and engine were setup correctly at the factory. Before ordering my Holley ( 750cfm vac ) I checked Holley's website and pluged in the components of my engine and purchased the unit they recommended.

My investigation started by checking out the Holley website.

Holley TV : Featured Holley TV // on the PowerTV Network

After watching the videoes I checked my vacuum lines and found a leak that I fixed.
Now the engine is much easier to start and idles better at a lower RPM.
I'm planning on buying a vacuum gauge to so I do more checking.

There is also an informative video on the importance of selecting the proper spring for the secondaries. My spark plugs tend to foul up so I'm wondering if I put in the wrong spring. Right now I have the yellow spring installed.

Timing is the next item on my list to check. I don't know a thing about timing/vac advance, so I checked youtube and found this:

How to set your ignition timing - YouTube

So far the tuning up my engine has been educational and fun.
If anyone has any suggestions please let me know.

Roger

[TButtrick]

What "factory" did the engine come from? If your carb is "new to you" you should bench check all the static settings per Holley. Idle air mixture adjustment is normally associated with max vacuum but 1-1 1/4 turn out on each side will get you close. Check base timing first then check total timing.