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Where to gain power on na 5.3

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Old May 19, 2022 | 01:50 AM
  #51  
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Originally Posted by arthursc2
You can't. Square port heads only fit 4.00" bores or bigger

get the 706s ported and 2.0 valves put in them
somebody was making ls3 heads with small valves to work on 3.8" bores I think. I'll have to dig around and see if i can find it
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Old May 19, 2022 | 09:09 AM
  #52  
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Originally Posted by RDF1
somebody was making ls3 heads with small valves to work on 3.8" bores I think. I'll have to dig around and see if i can find it
GM does. Bout $2000 for the set though.
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Old May 19, 2022 | 09:32 AM
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Part number? Never seen that
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Old May 22, 2022 | 07:04 AM
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Originally Posted by shakenfake
Part number? Never seen that
https://www.gmperformancemotor.com/parts/19201807.html

Thought there was a 4 bolt version but looks like its only 6. Beefier heads though. I have the LS3 version on my 427.
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Old May 22, 2022 | 11:51 AM
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Originally Posted by RDF1
somebody was making ls3 heads with small valves to work on 3.8" bores I think. I'll have to dig around and see if i can find it
MAST Motorsports. https://www.mastmotorsports.com/coll...label-head-240
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Old May 22, 2022 | 12:01 PM
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Originally Posted by MikeGyver
Which he?
Freiburger
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Old May 24, 2022 | 09:10 AM
  #57  
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Originally Posted by 1FastBrick
$5000....... hahaha
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Old May 27, 2022 | 10:07 AM
  #58  
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Originally Posted by adriver
Freiburger
So I guess I don't understand. Do you think he looks older or younger than his actual age, 54?
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