I knew they would flow much better numbers- all I did was cut off the flange and straighten the port- I've been taking heads to the flow bench for 15 years now, and if there's one thing you learn really quick- the straighter the port, the more the flow- also the bigger the port, the more the flow, but you have to have big cubes and rpm to use a really big cylinder head. the heads on my 455 Pontiac are 290 cc intake ports that flow 317 cfm, with 470 CID under them. Engines are air pumps, and IMHO, airflow is everything. You can have too much at a certain point, but these passenger car engines like the nail, are so under-ported to begin with, you can't overport them. They were designed so your mom and grandma could drive quietly to the store, but yet get up and go when dad or jr. kicked it to the boards. for the record, I didn't leave the nailhead group, they banned me for some bs reason those heads were rusty, yes, you'd be too if you sat outside for a couple years ! make an intake for those heads, and port them, and you'll make some bodacious HP here's a pic of my Pontiac 470 CID w/tunnel port heads good thread, worth reviving, can't believe my nailhead experiment heads ended up in a thread somewhere, but this makes it all worthwhile- I took a lot of s#$t from people on the nailhead group for these unorthodox ideas- for some reason they had tunnel vision blinders on, and didn't want to entertain any new airflow ideas. Those guys were all hung up on zoomie heads, with no collectors, which have been proven time and again to actually lose a bunch of power ps- I called myself rottedhonda, because I hate those damned noisy imports with the 4-cyl and fartcan exhaust !