273 commando Build

thanks 66fs ! Another scenario i was thinking is this blown head gasket issue always happened only when I stabbed the pedal to the floor in first gear 4 speed low first gear.... the rpms would respond to 5800 arms in a sec blowing the tires away..REV LIMITER SET AT 5900 could it be .... the fast revving to 5800 could be an issue ? it revs so fast the pressure builds up in the cyl and finds its weakest point when it blows. I have free flowing long tube hooker super comp headers 1 5/8' 2.25 head pipes into 2.25 dynomax ultra 2.25' inand out dumped before the axle. SO THERE IS NO RESTRICTION.