Originally Posted by fast68plymouth
Originally Posted by JERICOGTX
If the RPM numbers on the dyno sheet were 1000 higher, no one would bat an eye...


That’s not the issue I have with the results, especially if the headers in use were in fact 1-3/4 to 1-7/8 x 3.5.


Yeah that size header will really choke it down.

69 GTX 68 Road Runner