Dunno yet waiting on the cam master to come up with something. .030 seems like a bit much lash for a marine deal. Who's cam are you using?

Previous cam was hydraulic .721 .721 280 296 @50 idled at 500rpm in and out of gear with Holley Dominator Carb. Don't think you can get that kind of idle with EFI and long duration cams for all the carb haters...

Sounds like you are stepping up to the Big Leagues

both of you are in the big leagues w/ those cams.real nice

Originally Posted by 14 apache

Psi springs will se how they do CT1542DML Damper 1.580" 1.155" N/A .755" [email protected]" [email protected]" 513 .070" .780" 1.200"

My old cams where 276 284 with .750 after valve lash. these made peek 6700 rpm,

I ran the same cam in my Procharged 598 with BB2Xtra and then Big Dukes, did you run the above mentioned springs with it ?

GPM haven't used these springs yet.
What big dukes did you run? And did you ever dyno it? Looking for rpm range.

Did you know that Bullet does not have any lobes in their master list with more than .020 lash? What's the deal with you cam? Something doesn't sound right...

The lash that they list is at the cam not the valve

Gotcha

Dynoed with both heads, BB2 xtra made 1372 @6200. I never got a good pull with the CNC 1801 Big Duke only know I gained another 6 or so MPH.
And I was wrong about the cam, it was a Comp Cam 276/284 @.050 .782 lift.solid roller. Crower 68806 springs with the 2xtra's, 68848 and then Pac 1348 with the Big Duke.

Curious, what springs were you running with this set up ?

CT1542DML I never used this spring yet.
I ran the old comp cams spring it was 210 on the seat I think it was 2.000 spring height diameter was 1.560

210 at the seat with a 2.4 valve ? in a symetrical head ? with that 276/284 cam ?

That pac 1348 spring has big pressure how does it hold up?
The cam lift is that with lash?

HH383 Brodix head with stainless valve 2.400 yes #210 Don't forget NA

The valve train looked great other than the intake lobes getting torn up from opening the valve.

In my opinion thats what you need to control a 2.40 stainless valve in a Big Duke head. I used to run it up to 7500rpm at the shootouts, never had a lobe, lifter or spring problem.

The springs I ran on the dyno had 275 at the seat and floated at 5100rpm, the motor was making 1327hp at the time and then started bouncing all over the place.

Yes with a stainless valve you need big pressure. My big dukes have titanium just to help the other parts out.

I ran 260lb at the seat on my BB2xtra 2.3 valve N/A 583, are you talking solid or hydraulic roller ?

Ya the boost was not helping that. My engines with 210 on the seat we ran it to 6800 on the dyno and it worked ok with 2.400 valves. It took a long time for the lobes to start to fail 3 sets of lifters later.

Solid roller.
We have run this at 6200 for 20 miles on some poker runs and fun runs.

The titanium should help but it's not the only thing moving in there.

I am still listening?

Did the 55MM cams and .937 lifters also. You running bushing lifters?

We had the same problem way back when, all N/A motors wearing out lifters and cams, against the reccomendations of all of the cam techs we upped the spring pressure and our troubles went away.

Yes I tried the bushed lifters, only went to the .904s, think about the lifters bouncing over the nose of the cam and part way back up the other side. What size push rods were you running ?
Before this goes to far and maybe it already did because we stole this guys thread. I just wanted to say, I'm not an Engine Builder, I don't sell any parts, I can only relay what I have found from my own experiance, spending lots of money and breaking lots of parts. In the end my boat ran pretty good, what worked for me may not work for you.

Yes I thing the valve weight for me was to much to get moving. One other thing I did witch I think hurt me was .165 push rod didn't have any flex to soften up opening the valve. I understand that stiff pushrods are a good thing but I don't think it did me any good.
+1.75 rockers

I should pay to spintron my set up.

I ran the .130 on the N/A motors and the .165 and .200 on the Big Duke, I'm still betting on lack of pressure, who sold them to you? did you check the pressure after tear down ? Good luck with your build !!

Bought all the stuff from my buddy's engine shop. All the retainers and shims had no sign of valve float and valve keepers weren't jammed. Still have the old springs in a box here ill check them just to see.

What lifters were you running ?

Crane ultrapro.842

Tried Cranes in one motor, they were undersize for the lifter bores and it lost oil pressure, we had our best luck with the Crower 66291H. They may be better I don't know.

You still running bushing lifters?

No, that was several motors ago when I tried the groove lock lifters.

How did they hold up and what would fail on them? My friend is thinking of using them I told him not to.

They were the Crowers, can't remember what destroyed them, may have been one of our spring issues. At that time is was around $600 to machine the block and a $1000 for the lifters.

You two should just call each other

You never know you might learn something to make your boats go faster!:boat:

keep posting,this is good info.