Quote:
Originally Posted by Bill Verburg
flanges needed are a function of the stud length
studs were,
20mm on most 3.0
22mm on most 2.4
30mm on 3.2
there are a few oddball 25mm too
You can use thin flange on a long stud, there is just extra stud sticking through
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Thanks - so thick flanges were designed for 84-89 cars purely to accommodate longer studs - seems shorter studs would have been more cost effective at the factory.
I had 42mm OD Turbo Thomas headers (thin flange) on mine before and had collars made up to make up the difference in flange depth -headers worked well performance wise but heat was minimal.
My 3.4 has been stroked into a 3540 using a Gt3 crank, so I’m looking at options.
I see PMs have a B&B option with I believe is a bespoke primary length - anyone confirm how this differs to standard B&Bs?
http://www.patrickmotorsports.com/part/1-58-exhaust-manifold-headers-heat-exchanger-set/