Progress! - New Cam

[Chryco Psycho]

ALL true , Dual springs do require the steams to be trimmed for smaller diameter seals , surprized that the 702 calls for a dual spring 

[jimynick]

While dual springs and PC oil seals are nice, why can't you call the tech line and explain your setup- as is? Why not use a single spring appropriately rated that'll fit your valve spring pocket and guide boss? As you noted, the engine won't likely go much over 5000, so it's not like you're trying to qualify for Stock Eliminator. Sometimes the KISS principle has something going for it. 

[chargerdon]

Yes, i have the number.   

It was right on the cam card of my 703 Cam.   Springs are part number LUN-73195-16, retainers are 75740-16, single groove retainers number 77112-16 (note the locks were the difference as a kit would have come with 77126-16 locks which would not have worked.   

But, please remember my 360 wasn't stock as I removed a Mopar Purple 508 cam, so it already had dual springs in it, and the valves weren't stock either.  The tech new this because they were single groove for the locks, he said all mopar 360's stock had dual groove locks.

So my heads very well might have been machined before when the Mopar dual springs were installed. 

My only issue was after installing and remeasuring the pre-left i was reading between .080-.085, instructions says it should be between .020-.060.  Called tech line again, and the tech said that while between .020-.060 was ideal .080 shouldn't be a problem as chrysler usually set the pre-load with stock parts at around .100, so he said if it runs fine (which it does) to not worry about it and don't spend the money for shorter push rods.  Lunati Techs were very very patient with me and helped a lot !!   

Good luck...i would call lunati tech again, and see is there are any other of their springs that they could recommend that would fit!   

[Cudajason]

While dual springs and PC oil seals are nice, why can't you call the tech line and explain your setup- as is? Why not use a single spring appropriately rated that'll fit your valve spring pocket and guide boss? As you noted, the engine won't likely go much over 5000, so it's not like you're trying to qualify for Stock Eliminator. Sometimes the KISS principle has something going for it. 

Yeah that's my plan.  the guy I spoke to on Friday did not indicted there were any other options, but I will try again.

I think I am going to go ahead and put everything back together and break in the cam with the outer springs.

I do have a set of factory 340 springs, but I can't image those are the same specs.

@Chryco Psycho , I agree I was surprised that the cam called for dual springs.  I think it has to do with the lift???

@chargerdon thanks.  I understand the difference in our set up, but was just curious as to what springs you had.  Those are the same as mine.

Jason

[Brads70]

Maybe check and see if the beehive springs/retainers are an option? That's what I used from Lunati, I think ( it's been awhile?) they are single spring?

[Cudajason]

The crank seals look to be different diameters? No? If you need those fuel pump holes helicoiled I think I have a 3/8" kit here?

Hey @Brads70 I forgot to respond to his comment...the crank seals are the same, but the purple cover the seal mounts from behind and the blue one it mounts from the front.  No idea why!

Thanks for the offer on the heli coil...of course the bigger problem seems to be that the top water pump mounting hole is cracked on the blue cover.  So I don't think with one will work!!!

Jason

[Cudajason]

Well I received a response form the Lunati Tech line today:

"The cam is small enough to get away with some brand new factory springs. Just don't use well used springs. You're looking for around 100lbs on the seat and around 280lbs on the open side."



Not sure why they recommend dual springs and include them in the Kit for this cam...but they do!

At this point I am going to bolt everything back together (once I get a timing cover) and break the cam in with the outer springs, then change them over to well I am not sure yet...I am going to look at options for a spring that fit the above specs.

At least I can move forward now.

Jason

[Cudajason]

I have a set of stock 340 springs, retainers and locks siting around.

The specs I found online indicate that they are close to the specs listed in my last post.

I really do not want to buy another set of springs, retainers and locks at this point

I think I am just going to go with these springs and see how she runs.

Does this sound like a good idea or am I just being stupid.

Jason

[chargerdon]

Just remember with the stock springs, keep the redline at 5500 or less and you will be fine...  I would think...but im no expert. ! 

[YellowThumper]

I have a set of stock 340 springs, retainers and locks siting around.

The specs I found online indicate that they are close to the specs listed in my last post.

I really do not want to buy another set of springs, retainers and locks at this point

I think I am just going to go with these springs and see how she runs.

Does this sound like a good idea or am I just being stupid.

Jason

I second opinion that the new 340s you have will work sufficiently.  Stock bottom 360 should not be taken to the same rev limit as 340s anyway. Confirm seat pressure though. Also confirm all valve lock to spring seats are the same. If not then shim springs to compensate.

[Chryco Psycho]

if the spring rating is similar to the recommended springs you will be OK , the valve & spring have to stay stable with the faster ramp speeds this is why the increased spring pressure

[Cudajason]

if the spring rating is similar to the recommended springs you will be OK , the valve & spring have to stay stable with the faster ramp speeds this is why the increased spring pressure

Understood. What I can find online, they come close. I am not going to lean on the engine too much, so I will install them and see how it runs.

Finally made some progress.

Got the lifters and valve train installed and torqued down. Just put the intake on for kicks. Tomorrow I hope to clean it ip a bit and install it. I plan on skipping the cork gaskets on the end and use a beed of permatex copper gasket maker.

Feels good to get some parts back on.

Jason

[Chryco Psycho]

Good to see things coming together 

[YellowThumper]

Good to see it getting together.
Soon to 

[Chryco Psycho]

Any more progress ?