Ported X head 340 header size?

midnight340 said

Maybe milder than you are thinking? ... duration at .050" is 235/243, it pulls pretty good 2200 up. Solid with EDM lifters. Fun cam with good pull and a nice sound. I'm only running a 2500 stall from PTC. I do wish I would have had the heads flow tested the last time I had them off.
Just a feeling, but I think the motor would like to breathe better. I have yet to open the intake for the TQ (adapter for now) and think the headers are too small for what it wants. No way to know without trying it.

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That would be correct. I myself would do a 1-3/4.
I asked because of the 9.0-1 compression ratio.
I have a smaller (Hyd. roller) cam in the wife’s 360 @11.6-1 and TF heads W/1.6 rockers. Love the small cam high flow head combo.

I used to have a LD-340 with the MP mods. Opened up for a TQ and a milled down divider. I ran it with the big TQ. Sold it here a while back. It was very good with the mods and a high lift cam.

(Note, I’m a nut case that would try everything because I can... for no other reason because I can and don’t mind tinkering with what others call good or perfect.
Why? .... No, why not! Because I might find something!
More Power! ROTFLMAO!)