John,
We use the best materials in our heads as well as our Aluminum Blocks. Both are Heat Treaded to T6 temper.
Gabby L. Just did a set of Tgers for a New York Customer. The customer called me with the Dyno information stated he was very please to see 1089 H.P. with no vacuum on a single carb. motor naturaly asperated.
Nothing that I know of was welded or moved around in the head. It was not a all out motor but a bracket motor build.
I hope someone will post the Dyno Sheet soon.
__________________
 Bob C.
Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads
Boss Bird Funny Car
Best pass to date 08/06/2016 [email protected]
Allpontiac Big Chief Aluminum Engine Block
http://www.AllPontiac.com
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