Ported LS3 10 degree heads

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NewbVetteGuy
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Re: Ported LS3 10 degree heads

Post by NewbVetteGuy » Tue Dec 04, 2018 11:40 pm

Carnut1 wrote:
Sun Nov 25, 2018 3:03 pm
20181125_145419.jpg Always good to have an extra head to work on. Obviously the intake and exhaust on this casting share a wall. So wider on ssr towards exhaust is very limited. Pic of exhaust bowl. .1" measured but the aggressive nature of the burr bulged aluminum.
Beautiful texture! * beautiful. Sorry for mentioning "he who shall not be named on ST", but the guy has the port texture [Blank Post] down.


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Re: Ported LS3 10 degree heads

Post by Carnut1 » Wed Dec 05, 2018 4:14 am

Thanks, after pri I will sit down and feed all the specs into the program and see where I am. It looks the part but I am not thrilled with this casting.
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Re: Ported LS3 10 degree heads

Post by Carnut1 » Sun Dec 09, 2018 1:55 pm

Resized_20181209_132857_6351.jpeg
Going to try this texture on a mildly reworked port and see how it does.
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Erland Cox
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Re: Ported LS3 10 degree heads

Post by Erland Cox » Mon Dec 10, 2018 11:57 am

On the dyno?

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Re: Ported LS3 10 degree heads

Post by Carnut1 » Mon Dec 10, 2018 12:19 pm

Maybe in the future if I know it will be for a production cnc design. For now just bench testing. Thanks, Charlie
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ClassAct
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Re: Ported LS3 10 degree heads

Post by ClassAct » Mon Dec 10, 2018 2:34 pm

Carnut1 wrote:
Sun Nov 25, 2018 9:25 am
Resized_20181125_091331_2737.jpeg50 degree seats with 50 degree valves. 87 % intake throat, 87.5% exhaust throat, no backcuts. Notice the introduction to noisy turbulence on exhausts in mid lift where it was less pronounced on earlier tests.

IMHO our bowl is WAY small with a 50* seat. I run 87-88% bowls on 45 stuff. You should be in the 92% range on a 50 degree seat. That's one of the values of a steeper seat. You can get the bowls to where they should be, without losing the entire valve job.


Can you say where you got this set of cutters? I'm assuming you have a different cutter for the intake and exhaust.

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Re: Ported LS3 10 degree heads

Post by Carnut1 » Mon Dec 10, 2018 3:15 pm

ClassAct wrote:
Mon Dec 10, 2018 2:34 pm
Carnut1 wrote:
Sun Nov 25, 2018 9:25 am
Resized_20181125_091331_2737.jpeg50 degree seats with 50 degree valves. 87 % intake throat, 87.5% exhaust throat, no backcuts. Notice the introduction to noisy turbulence on exhausts in mid lift where it was less pronounced on earlier tests.

IMHO our bowl is WAY small with a 50* seat. I run 87-88% bowls on 45 stuff. You should be in the 92% range on a 50 degree seat. That's one of the values of a steeper seat. You can get the bowls to where they should be, without losing the entire valve job.


Can you say where you got this set of cutters? I'm assuming you have a different cutter for the intake and exhaust.
Thanks Class, my first 50 degree seat port so I was inching up on it. That is good info, I only have stones so no cutters. Charlie
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