New 440 build issues

[chermik1999]

Heads are 346 re worked. 2.14 and 1.81.

 

[Curiousyellow71]

703 is good fit. It should run vacuum brakes just fine.
I like the 346 heads. They are hard to screw up..pretty much any grinding improves flow.
906s have different intake ports then 346s.
.0042 per cc removed so removing .020 equals 82-83 cc, with those piston it's about exactly 9:1 using summit calculator and assuming the deck is blueprinted. I would be surprised if it was? But it will run really good w the 703. A edelbrock rpm would be much stronger on this if you want to play further.

 

[chermik1999]

Yes exactly....are you a builder by chance?..lol...very good

 

[chermik1999]

Now...the Q.
Ready to finish but rods too long. Went stock length ball/cup. So I made a measuring rod and looks like I need .375 shorter. So like 8.78
Comp 9.157 in hand. Maybe should have theses shorted?

 

[Curiousyellow71]

I have screwed up plenty and try to learn from it. If I were a real builder/racer it would pay my bills. Lol

Holy smokes .375 shorter..that can't be.Lol

 

[chermik1999]

Well that's as close as I can get to.
Sorry...was taking out the inside cup.
Comp 7530 are 9.50. I meet. 375 shorter
So maybe 8.750. Here's my checker with 1.5 turns in.

 

[Curiousyellow71]

I would expect to adjust them enough to fit doing a 703 in place of a .509 MP. The cam base circle I don't believe is that different effecting push rod length.
What do they look like adjusted with a 1/4 turn preload.
What procedure are you using to adjust the valves? Was this the pushrod/rocker combo it had?

 

[chermik1999]

No...it's new. Had stamped stocks so I upgraded. That's why

 

[chermik1999]

These ones...shorter length needed

 

[Curiousyellow71]

Lol..That makes sense then.
Got to be careful buying pushrods there is effective length and overall length. It gets a bit confusing to recommend anything without knowing what is being measured. But, here are some links that might help. If you have researchef this stuff, it may help someone else.
https://www.compcams.com/valve-train-geometry/

 

[chermik1999]

Thanks dude. I'm working with a builder here in AB, Canada. Aside from the bad judgement in Ontario, my AB guy from Passion Customs has never steered me wrong yet. Just expensive...lol.
Think I'm on right track. Center line across valve stem looks good with my measuring rod.
Comp measures to the end of the cup, so inside is approx 3/16" or .1875. So I arrive at 8.9375 approx. Trying to see.if one is available in stock before running to Smith Bros. So waiting to hear.

 

[chermik1999]

There's a bit of forgiveness with hydraulic lifters. So should be pretty close.

 

[chermik1999]

Otherwise could always go back to stock stamped and call it a day and have it running tomorrow. Gone this far so may as well go rollers..

 

[chermik1999]

Update.

Close just waiting for push rods.
But thought better double check my degree skills. After 5x checking, I'm.at 104-104.5. Supposed to be 106.
Do i change it or just roll?

 

[Curiousyellow71]

I have seem them stretch a bunch after some use. Measured one double roller that retarded the cam 8 degrees after 10k miles. 1.5 degrees advanced on this combo isn't anything to lose sleep over. But, we generally would take time to see if we can get it closer.

 

[chermik1999]

Well with only 2° slots, don't wanna go backward. I'm fine advanced 1.5-2. Like you said, it will relax a bit so it should get close to spec.
I'll re degree again tomorrow or Monday as it's holiday here Monday so long weekend. Mama getting ouch at me so many days in this one..lol. gotta take her golfing first.
But when I'm at high lobe lift, it has like 9° of dwell. So maybe I'll try getting a better measurement in the lifter.

 

[chermik1999]

BTW.
Thanks for the help.

 

[Curiousyellow71]

Well with only 2° slots, don't wanna go backward. I'm fine advanced 1.5-2. Like you said, it will relax a bit so it should get close to spec.
I'll re degree again tomorrow or Monday as it's holiday here Monday so long weekend. Mama getting ouch at me so many days in this one..lol. gotta take her golfing first.
But when I'm at high lobe lift, it has like 9° of dwell. So maybe I'll try getting a better measurement in the lifter.

We always advanced them 2 degrees to allow for chain stretch. Doing that is what I consider installing the cam straight up. 104.5 is close enough on a 106 icl.

That is from a Mopar Performance Engine book from the 80s and has always worked for us.

 

[chermik1999]

Yuup...i would agree. I'll remeasure one more time so I can sleep at Night...lol. Now just some push rods

 

[chermik1999]

After all this I thought I should pop off a valve cover on the other 440 build from them. I supplied the top end this time.

I don't think this is gonna fly....

How much lateral offset before its a no go and start grinding towers/shimming?