Thread: Merlin oval port opinions

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Originally posted by Superjim427
pat do you thin 1 3\4 header are to small for a bb turning 6000

you would have to try more than one set to find out. but on saying that the primary tube leigh as lot to do with this as well and the EX systems and mufflers if you have a X cross in it. the size 1 3/4 would work BUT 2 inch on a 454 may work better alot of the headders i have built for big blocks are 2 1/4 to 2 3/8 for engines from 509 to 632 so i think it may work better with 2 tubes i did some work on a468 from2 inch to 2 1/4 tubes thinking it would kill so bottom end ? NO it did not and went from a 456 gear to a430 and the car pulled much harder tire spin was the same so i do not think i kill the low end but had no dyno to back this up.this was on a 4000 pound car