Technical Desoto Hemi Questiond

The subject is actually valvetrain related. Would anyone happen to know the stock length
of the pushrods using a stock hydraulic lifter and non adjustable rockers for a 330 Desoto Hemi?

I presently have adjustable push rods and they are a bear to get to for adjustment with the motor in the truck. The motor is basically stock.

Thanks

 

If you have hydraulic lifters, why are you having to adjust them in the truck? I used adjustable push rods in my nailhead and adjusted them when I built the engine. I haven't had to touch them since.

 

maybe the cam was re-ground reducing the base circle on the cam therefore requiring adjustable pushrods

 

To answer the OP's question, I tossed mine when I put adjustable in but I would say call Hot Heads and ask them. They are a wealth of knowledge and parts for these old Desotos.

 

Good point. I have the cam card, I’ll check it.

Engine is recessed making the adjustment on #7 and #8 impaossible with adjustable pushrods

 

Also, another issue is lifter pump up. When starting the motor after sitting for awhile I get lifter clatter, mainly on the p***enger side. Depending on how long it’s been sitting it will quiet down. Obviously the lifters are bleeding off somehow.
I’m running the later model lifters. I also have a set of refurbished stock lifters. Big difference between the two in terms of the oil bands.

seems like apples and oranges in terms of the clatter on startup and the adjustment issue I have.

 

That is not a problem with adjustable pushrods.

 

The adjustable pushrods ****! They have just enough run out that they just tickle the heads as they move up and down and rotate. Makes for an intermittent tick.

I'm thinking of going back to original pushrods. My block was decked a small amount as well as the cam ground down.

 

so what are your options?

1. adjustable pushrods
2. adjustable rockers
3. set it up with adjustable pushrods, tear it down, mic the pushrod and have custom length rods ground to size or if you're lucky, find an existing pushrod by searching through parts catalogs.

 

The stock length of the 330-341 pushrods are 9.570 and 10.850 and yes Michael had a reground cam in the engine.
As mentioned, once preload is set and the pushrod lock nut is secured there should be no further adjustment needed. The clatter could be caused by the varying bleed-down rates for late mode lifters (ht2011) compared to the oem VL8 or HT812. If you have oem lifters you should use them.

 

Thanks Gary. Yes, I do have the OE lifters. I am ***uming he used the later lifters. With the OE lifters the ball ends on the adjustable push rods may not work. That’s why I’m looking for the stock push rods.

 

In comparing the stock lifter with the later lifter I notice the oil band on the OE lifter is set higher than the later lifter. Could be the band on the later lifter is not exposed to the oil galley thus it takes the lifters longer to pump up.

 

Yes, the early lifter uses a 1/4 dia tip and later use 5/16 dia tip.
And most ***uredly, the location of the oil feed groove will affect how much oil gets to the lifter. Although the 2011 lifter will work, it is not the best.