Gen 2 Voodoo block for Coyote build

[4sdvenom]

At least you snapped the head stud and didn't strip the threads out of the block!

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[Plimmer]

At least you snapped the head stud and didn't strip the threads out of the block!

Yeah, I got lucky. I’m also an expert at removing broken stud bits from blocks. DM me if you need advice in this area, but hopefully no one ends up with a bust stud like i did.

 

[Angrey]

Also heads up if you guys use the ARP head studs, my experience was a major fail, I snapped 2 studs and eventually gave up and went with the factory head bolts.

Apparently the trick is to make sure the washer is scuffed up on the side that touches the head. The goal is to ensure that the washer does not slip against the head else this will result in over torquing the stud and it will snap.

The whole point of having dowels is so you can align the heads and use either bolts or insert the studs after the head is already on. I realize it's anal, but if you don't get everything lowered down perfectly you scrape the stud holes (soft aluminum) with steel hard as woodpecker lips (stud threads).

 

[bauern]

I tried that number too, lol. Actually, it is parts.ford dot com that I got that part number from. I believe it's the official ford site. You don't get the full part number until you complete your order. I ordered one of each to compare.

Anyone know where I can get a picture of the GT500 valvetran under the rocker covers?
I have all three rocker arms, but they are so close that without an accurate fixture, it's not possible to measure any difference accurately.

It might be moot anyway as I forgot that the GT500 has different reluctor wheels at the end of the cams.

 

[olaosunt]

J and G are 18 GT and GT 350 , right?
No K ?

 

[bauern]

J and G are 18 GT and GT 350 , right?
No K ?

Correct
Side note: HL3Z-6564-B (not -D) was for a 2017 3.5 ecoboost and has been replaced by JR3Z-6564-A (18GT #).
No one can tell me which engine K is for.

 

[olaosunt]

So are you sure the HL3Z-6564-D is the predator ?

 

[bauern]

Not 100%. I know ford makes mistakes in their parts catalog but they also reach into their parts bin for use on new engines. They also have a different number for the adjuster, but that's probably the old M-6500-M50R adjuster as that seems to have dropped from the Ford Perf. catalog.

 

[olaosunt]

Not sure how much stock I should put in to but MMR says the Ford Performance rollers can be used in the GT500/350 Heads/with GT350/500 cams .

 

[bauern]

I would lean toward the GT350 rockers as well. I can't see anything different about the heads that would indicate otherwise.

It would be interesting if the 18 GT rockers interchange as with their 2.0 ratio the lift would increase from .551 to .580. They would require the appropiate checks, PTV etc.

 

[engineermike]

@bauern so which dimension do we think is changed to get the different ratio? If the valve and lash adjuster locations are fixed, all that can be moved is the roller. That would change the roller relationship to the cam, which changes the cam timing as well.

 

[bauern]

nvm probably wrong.

 

[olaosunt]

I wonder what cams the Cobra jet uses
No Ford parts listed but mentions a “hybrid “

its also cool to see how much of timing component is same as regular 5.0/5.2 .

Also wonder why F-150 oil pan ?

i considered the GT500 pan for my predator block /builds but since my application is drag oriented will be sticking to a pre 18 GT pan as well .

 

[engineermike]

nvm probably wrong.

I’m not sure if I understand what you’re saying, but are you saying that a different base circle could actually put the same-geometry rocker at a different enough angle such that it acts like a 1.9 on the 5.2 but a 2.0 on a 5.0?

 

[4sdvenom]

I believe the Cobra Jet “hybrid cams” are GT350 spec cams except for a cross plane crank. Thus requiring the 5.2 rockers due to the smaller base circle on the cams. The cams and followers only work together but they can be used in 5.0 heads if the rockers are slightly clearanced. MMR sells them already modified for use in a 5.0. I’m sure this was already covered but was just adding it just in case. There was a thread on another site by MMR outlining the requirements for 5.2 Voodoo heads on a 5.0 with the hybrid camshaft and the subject of using those camshafts in a 5.0 head was covered with using the modified 5.2 followers. I believe it was stated there would be binding issues if trying to use the 5.2 followers with a standard 5.0 camshaft even with the clearancing due to the difference in base circles on the camshafts.
If I’m posting things already mentioned I apologize.

Ken

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