Timing with .590 Solid..

[Sweet5ltr]

Just installed the .590 Mopar Solid Flat Tappet Cam... Sounds wicked! Set valve lash, .030/.028 per instructions from Mopar for aluminum heads. Two to three threads showing on Crane Ductile Iron Adj. Rocker Arms when adjusted; guessed on push rod length, so pleasantly surprised. Here is my question..

With my previous hydraulic flat tappet camshafts, with 108LSA-110LSA my initial timing was around 14* and total around 34* on pump gas. Car now sets 30* @ 1250RPM or at idle speed after cranking. At 2,000RPM the timing is over 40* total.

Is it fine to lock the distributor up at 28-32* on pump gas for a street car?

 

[RustyRatRod]

Yup, it'll be fine. The reason it is wanting so much timing is because you have low static compression for that camshaft, so it is wanting more timing to run right.

 

[Sweet5ltr]

Yup, it'll be fine. The reason it is wanting so much timing is because you have low static compression for that camshaft, so it is wanting more timing to run right.

Thank's Rusty.. Very relieved that everything went well with the install and break-in. Going to lock it out tomorrow and take it for a test drive.

 

[RustyRatRod]

Post some videos. I bet it sounds nasty.

 

[Sweet5ltr]

Have to wash it first! :happy7:
Haven't been home in quite some time.. Just on leave at the moment.

 

[RustyRatRod]

Have to wash it first! :happy7:

Vanity. One of the seven deadly sins. lol

 

[383man]

My cam is very close to that cam as it is like .592 lift but I use 1.6 rockers for about .630 lift. It is also 264 & 270 at .050. I run 38 total all in by 1800 and it works great. I never tried 40 as I have not got back to the track to try it and see if it likes it. Good luck with yours , Ron

 

[Sweet5ltr]

My cam is very close to that cam as it is like .592 lift but I use 1.6 rockers for about .630 lift. It is also 264 & 270 at .050. I run 38 total all in by 1800 and it works great. I never tried 40 as I have not got back to the track to try it and see if it likes it. Good luck with yours , Ron

Thanks Ron,
Plan on locking it out tomorrow. This is a street car, but never had any issues starting today when it was at 30* initial after it warmed up. Didn't want to idle at 20*, was dying off at 1,050RPM. May not have the compression that we were initially told. Valve reliefs are very deep, so may be sitting on around 10.5:1CR. Don't have the build sheet for the short block. First solid lifter camshaft setup for me.. :headbang:

 

[67 B-body]

Tomorrow late afternoon, I'll double check my ign timing and report it here for you...... My Boy has a football game in the late morning to go to first.
I don't remember off the top of my head what I ended up with, but it runs VERY STRONG!!!
I advanced my MP 590 cam a bit though when I installed it, so I'm sure things will be a bit different. I have a lot of compression @ 13.5 :1 with (Victor) closed chamber aluminum heads too.

 

[383man]

Forgot to say that my comp is 10.6 as I run only pump gas. Ron

 

[Sweet5ltr]

Thanks Ron. Don't know if I will go that high, probably around 30-32*. As long as it starts up around this area with the distributor locked. Mopar Engine manual says 38* total for best performance.

 

[Hemirunner]

Those Eddy heads are 84cc and will like 34-36 real well. Did you set the lash with the engine hot? With aluminum heads, lash will grow when the engine reaches temperature. Cold lash will need to be tighter. You may find that you need a start retard.

 

[67 coronet]

just slapped the same cam into my current build.(changed some motor stuff to make it resellable)glad to here it sounds really good.have you driven it yet to get a feel for the power?

 

[Sweet5ltr]

Those Eddy heads are 84cc and will like 34-36 real well. Did you set the lash with the engine hot? With aluminum heads, lash will grow when the engine reaches temperature. Cold lash will need to be tighter. You may find that you need a start retard.

Lash was set cold.
.026 INT/.030 EXH. cold with aluminum heads.
Cam card states .028 INT/.032 EXH cold with steel heads, was told the above lash specs from MOPAR for my Performer RPMs. I actually have a switch for the ignition box. Can turn the car over with the starter, then flip on the ignition.

 

[kdtjb]

I set my .590 with Indy alum. heads cold at intake .018 and ex. at .022 The heads will expand with heat and that should get you to in. .028 ex. .032

 

[Sweet5ltr]

We were told to set the above lash numbers mentioned when cold.. I will definitely keep your postings in mind KD. Hopefully it will get a test run today. Don't want to drive it with the timing so far off. Idled around the yard and it sounds radical. Has 24* Mech. Advance, so after setting at 20* initial it is too far to safely drive. Just going to lock the distributor for now. Was fine with the older cams being set at 14* initial.

 

[RustyRatRod]

We were told to set the above lash numbers mentioned when cold.. I will definitely keep your postings in mind KD. Hopefully it will get a test run today. Don't want to drive it with the timing so far off. Idled around the yard and it sounds radical. Has 24* Mech. Advance, so after setting at 20* initial it is too far to safely drive. Just going to lock the distributor for now. Was fine with the older cams being set at 14* initial.

All that is cause it really has too much cam in it now......but it'll run good once you get the timing sorted out.

 

[Sweet5ltr]

Can never have 'too much cam' :headbang:

Car runs fantastic, much more power everywhere. Multiple comments on the idle sound at the local car show. Haven't even got it over 3,000RPMs. No tuning yet. Going to modify distributor tomorrow.. Just going to limit the mechanical advance, so it is easy to start and totals out at about 36-38*.

 

[RustyRatRod]

Can never have 'too much cam' :headbang:

Car runs fantastic, much more power everywhere. Multiple comments on the idle sound at the local car show. Haven't even got it over 3,000RPMs. No tuning yet. Going to modify distributor tomorrow.. Just going to limit the mechanical advance, so it is easy to start and totals out at about 36-38*.

Well, yeah you can have too much.....but there's always ways to work around it. I like them kinda builds. Old school. That's why I'm doin one. I'm gonna have more cam in my 383 than you got in your 440 . LOL If I were you, I would play around with just locking the distributor out altogether.

 

[67 B-body]

OK,,
Sorry for the late reply,,,, I checked the timing out today on my engine that has the same camshaft (MP .590" lift).
The base timing is around 18deg adv, and the total timing is around 36-38deg adv.
I use a non vac adv unit made by Mallory, so it's pretty easy for me to adjust base and total timing with a few twists of a screw driver and a good timing light...
I also have 1.6:1 ratio rockers too.... giving .630" lift (before lash).