C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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Old Feb 9, 2013 | 07:17 PM
  #21  
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Originally Posted by donyue
I went with the Hedman 68300 for my engine. I had them ceramic coated and then installed them on my Dart Pro 1 straight plug heads. Everything fit perfectly. Did not have to ding any pipes and it was quite easy to get to the header bolts to tighten them.
I agree. No need for clearancing the Hedmanns. If it were not for the extra long aftermarket dipstick tube on my passenger side, both headers would be easy out just jacking the front end up and removing the collector and cylinder head bolts.
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Old Feb 11, 2013 | 01:35 PM
  #22  
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McJacks +1.
I put the 81 version with AIR tubes on my 78 to retain the AIR system.
The 81s are 2.5" the 82s are 2.25". Both (including th enon AIR) bolt right up to the factory exhaust system..no donut gasket required.

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