Quote:
Originally Posted by secondchance
30 mm is correct. Typically 2-3 have to be cut to 15-20 mm to clear the runner and start the thread.
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The stock manifold bolts with spacer on 90' show 1 inch or 25mm of thread beyond spacer. The stock manifold bolts show about 5/8 or 16mm of thread beyond manifold flange when installed. Given stock manifold flange is relatively same thickness as header flange a 25mm stage8 bolt would engage head also about 5/8 in (16mm).
LT5 Summit Racing 8905
LT5 8mm x 1.25 The underhead length is 25 mm or about .98 inches
