GT350 heads on Coyote (Fail)

[Fastime331]

I recently received a built and sleeved longblock and opted for the GT350 cylinder heads as the Gen 2 were causing delays on an already LONG lead time for delivery.
The builder knows how to configure the heads properly and it's a high HP Hellion TT build.
Anyone have experience with these heads on a standard bore coyote? I'm reading about valve shrouding issues and unsure if this will be a factor or not even to worry?
Otherwise I have my factory Gen 2 heads that I can swap on before I commit to installing this engine.

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[K4fxd]

What caused the valve to hang?

 

[GregO]

 

[bauern]

Update:
Went ahead with the GT350 heads with their "specially modified" rocker arms that are designed to work with stock cams and at 600 miles the #1 cylinder hung an exhaust valve and nearly destroyed a $15,000 engine.
Cylinder head is definitely damaged. Be warned.

M** modified Coyote rockers to work with Coyote cams on a GT350 head?

 

[GregO]

M** modified Coyote rockers to work with Coyote cams on a GT350 head?

https://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&products_id=885

 

[80FoxCoupe]

Lots go into making gt350 heads work properly. I skipped that path and simply did ported gen2 heads with Ferrea valves, Pac 1234x/Ti retainers, done.

 

[olaosunt]

Lots go into making gt350 heads work properly. I skipped that path and simply did ported gen2 heads with Ferrea valves, Pac 1234x/Ti retainers, done.

True talk .. ended up with 2 trashed pairs in the process of figuring out what works .

 

[Fastime331]

Yup, doing that now. Probably go CNC'd runners and Ferrea or Manley valves with Bronze guides and PAC stage 2 springs to work with the VCT.
Hope to have the engine dropped out this week.

 

[olaosunt]

Update, the engine builder installed unmodified stock rockers instead of the
https://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&products_id=885
ones that should have been in there. Also, they did not install the VCT filters into the cams.
Unbelievable.

who is the engine builder?

 

[larr12]

Wow. Who is the builder?

 

[K4fxd]

I guess more importantly, is the builder making it right?

Anyone who does this for a living will F up once in awhile. it's what happens next that counts.

 

[GregO]

Update, the engine builder installed unmodified stock rockers instead of the
https://www.modularmotorsportsracing.com/cart/index.php?main_page=product_info&products_id=885
ones that should have been in there.

Yikes.

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