Pulled the Hemi on Saturday, but had no more time to work on it, and Sunday we had family in town....So literally, at 8pm this evening I went out into the garage to look for the issue....AND I FOUND IT!

I think street driving is not allowing enough oil onto the intake springs to keep them cool enough....

Curious to see the faces of the broken parts. Can you post a pic of the broken parts so the fractured surface is clear to see? Good catch.

Probably next week when I get it apart.....This week I need it to mock up my header repairs.

Only found one broken spring...#5 Intake.....Last time it was 3-4 of them, all intake springs....

Kblam
I hope nothing else got hurt, bent valves, valve seats
Have you leak it yet? If so, is it healthy still

Kmotion ?

The first set I broke were the Pacalloy's from Indy, and these are Howard's....Its not the springs, its the lack of oil street driving it. I either need spray bars or RB T&D's....I think....

Open to ideas cause I know only one other person that made spray bars....Everyone else, says they don't need them, so its weird to me more people don't suffer from this issue.

I doubt Chips hemi has any better oiling to the intake springs than yours.

But....... maybe it does

Are you using pushrod oiling? Could that help get more oil splashing around those springs? Just a comment from the peanut gallery, assuming your lifters get oil

I've heard of lack of spring oiling to cause springs to go soft, never as a cause for them to break.

But I'm no Hemi expert.

Do your rockers have the oil squirt hole? My stock rockers do but I have an aftermarket set that don’t (non roller). What’s the ramp and close speed on that cam? Aggressive? I’ve heard of breaking springs with that type of cam. Bad harmonics

Yes, I believe they do...Might have one plugged with crud, gonna have to check.
Current cam is fairly aggressive...But it is not a race only cam

.470 is a lot of lobe lift regardless of aggressiveness. Springs are getting worked hard. What are the specs on the springs and what installed height ? Additionally how close to bind are you running ?

For reference I'm running in the .380 lobe lift range and have never had a spring failure with a lot of street driving and idle time.

AG.

Went back up and looked at spring, double with a damper? I’d look at coil bind with that lift to, .292 duration at .745 life is a race cam in my book and needs at least 1,550 triple springs with guides cut down. jmo

Coil bind was checked for at assembly, but I do not recall how much before I get into it...We always check it. What I do know is if you heat cycle heavy duty springs without cooling them with oil, they break....

And I know of members on here running A LOT more lift in a Hemi on the street than I am....Its a 605 and needs to breath...Heck the heads flow like 460cfm...So really, the cam would be kinda average lift for an engine this big. I run a .713 lift cam in my 400 based stroker....

Do you have any restrictors any where in the galleries? I agree that they need all the oil they can get. I have I think Mopar performance roller tip rockers that have squirt holes for the springs and the pushrod tips also. I put around 3000 miles on a set of springs with no issues. Also on the the pushrod oiling thing, I had a set of lifters like that by mistake and it screwed up the oil pressure like crazy. Most of us street guys running big cams with stiff springs I think need to put new springs in every now and then.

And yes, there is/are feed restrictors in the block right below the heads.
Springs were new last year, and I put about 2000 miles on them, and 70 miles on them this year, and then 2 drag strip passes....

I was talking to Tod Marsh about this and he agrees, the second thing oil does is carry away heat and that a street engine that is run for hours on end unlike a race engine needs oil flow more than a race engine. I don't have any restarts, or anything like that. Let it flow. I also made a tool to pull the springs without pulling the heads for this.

As stated, not sure what would be considered a "race only cam" if that one's not. .700" and 280+ duration lol, slightly larger than OE...

I run .767 lift on mine, I've worn out the first set of springs, retainers, and keepers after about 8-9 years. Also replaced 2 sets of pushrods, ( I raised the idle to 1200 and that has helped with the valve train oiling.

I think back and wonder if I had put a built 572 Wedge for this car instead of a Hemi, how many fewer times, would I have had to pull the engine for somthing like this? Probably never....Pretty frustrated to have to pull the engine every other year with so little run time on it. Half temped to sell it and build a Wedge motor cause the only thing I see solving this issue is a set of $5k Ray Barton rockers...