OUCH!
Am I seeing things right - it took out the block along with the cam and lifter?
x2 on the "OUCH!" and I had the same question... had to go look at page 1 because I'm not familiar with Mopar blocks:
Looks pretty much the same as far as I could see. That is a munged up deal though, wonder what let it twist or if the link bar just let go. Bizarre failure.
Last edited by Beagle; December 16, 2020, 06:33 AM.
lol yeah, it' really a great truck and Judd likes it.
Already ordered a cam. Went with a Lunati this time that has a little less lift, 2 degree wider LSA, and 5 degrees less @ 0.05". I think it will be a better fit for a truck with 35's. I have always felt the previous cam (XR268HR) would have been great in a 2wd Dakota, but maybe a bit much for 35's, 3.55's and a stock converter.
Cam will be here tomorrow. Radiator is out, harmonic balancer is off, started taking timing cover off and discovered that I forgot the middle 2 timing cover bolts are wet. Lol. Gusher. Called it a night. Haha.
Did you check the chamber CC on those heads? I'm thinking that should have pretty good torque with a 211* intake (little more with 1.6's) and fairly narrow LSA for EFI but on the edge of needing 91 octane at your elevation? I'm getting .517 lift with a 1.6 rocker, guessing the springs will be good.
Last edited by Beagle; December 18, 2020, 06:05 PM.
It's 9.5:1. 87 should be fine at our elevation. The 545 in the Mustang was 11.8:1 and ran on 91 with waaaay more cranking compression than this thing will ever see.
Springs are good for quite a bit more lift. The other cam was 0.571".
Thanks. I have three sets of rockers here. Stock, roller non-adjustable and roller adjustable and two seta of pushrods.
I played with a zillion different combinations over a period of three hours yesterday trying to come up with one I was happy with.
First, the new lifters seem to be great. They have a lot of plunger travel so it is real easy to see what is going on.
The adjustable rockers (PRW) are a no-go. The pedestals they come with are too tall and that puts the roller tip on the far edge of the valve stem. I would not be super concerned if it travelled back toward center as the valve opened, but it gets worse.
Stock rockers with a 0.035" shim and 7.00 pushrods seems like a workable option.
The non-adjustable rockers (Proform - my favorite of the lot) are real close. The pedestals are a bit on the short side for the 7.00 pushrod and real good with the stock pushrod. The roller tip is dead nuts in the middle and stays there to full lift with either. I think these will be our choice.
The caveat to all is the fact the pushrod is super close to the outside edge of the pushrod hole in the head. This is a known problem with the R/T heads. Because of this, I would prefer to use the good hardened 7.00" pushrods. We *could* try to clearance the holes, but it would be difficult to keep it clean and difficult to access the far back ones.
Stuck in a holding pattern. My analysis of the valve train showed that we needed to raise the rocker stands for the Proform rockers approx. 0.10". So I ordered a set of $20 CompCams pushrod guide plates for a Magnum. I *think* these are 0.083" thick, so we can add a 0.015" shim and be really close. Normally, we get Summit orders really fast from the Arlington store, but these had to come from Ohio so they won't be here until Tuesday. Boo!! At least the 83GT runs so Judd is not stuck without a vehicle.
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