Its the easiest and quickest way to remove headers or pipes. My father in law welds a inside sleeve in the header collector that the front pipe slips over..no leaks that way. I don't do it because I'm worried about the pipes "sticking together" over time. Plus I don't want to take away inside diameter.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2,generic one inch open spacer
373 gears 3200 Continental Convertor
best et 10.679/127.5/1.533 60ft
308 gears best et 10.76/125.64/1.5471
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