They are 1 7/8 into a 3.5" collector. And in watching what guys run at the track and even on the street with big stroker SBC's like mine, I see alot of them running big headers like I'm going to, and then they run 3.5" exhaust all the way and through bullet style or 2-chamber mufflers.
I want to get as much flow with the exhaust on as I can, so I'm guessing that after I get this motor running right, it should be able to utilize 3.5" exhaust. Any advice/opinions on that? I currently run a 3" collector with 3" exahust through 2 chamber 40series FlowMasters.
AND....I was trolling the net and came across Dr. Gas's website..where they sell oval exhaust tubing and even have a conversion chart that tells you what size you need in oval, for whatever size you were going to run in round. So, 3.5" exhaust is going to kill alot of ground clearance, but if I run oval exhaust, the oval equal is 2.5" x 4" oval. that gives mea solid 1" of ground clearance extra.
So I'd adapt my collectors to go from round to oval (dr. gas makes these) and from oval to round for my bullet mufflers that I have, and then dump out by the rear-end again with simple dumps.
Any of you wild guys have some info on this? How does it sound and if you think it's worth it to run that large of a exhaust pipe. :)
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