got my new heads

[project89]

ok heres the deal i got my new heads and they were supposed to be gen3's with D port ex ports and a slightly larger valve.but they turned out to be gen 2 heads with a round ex port and a .040 smaller intake valve.

was a lil pissed till i looked up the flow numbers.the gen 3 heads avg around 20 cfm more then the gen 2's on the intake,but they lose 6-10 cfm on the ex side.
so now i have no idea which heads i want to run

heres some flow sheets(granted these wont mean **** once there ported but this gives u an idea of what they flow stock)
stock iron heads
http://60degreev6.com/Articles/Pushrod/Flowsheets/10048651.jpg
gen2 aluminum heads
http://60degreev6.com/Articles/Pushrod/Flowsheets/10154743.jpg
and gen 3 aluminum
http://60degreev6.com/Articles/Pushrod/Flowsheets/10218170.jpg
now should i go for max flow with the gen 3's or use the better flowing at low lift gen 2's

[Ian]

better flowing at low lift. you're gonna be forcing air in anyway, so it really wont matter too much on the top end.

[project89]

thats what i figured but all the ppl over at ftv6 and thirdgen are saying its a waste to use the gen2's and id be wasting my time.wanted to see if somone could give a valid reason.other then they flow better at higher lift

[Tru2Chevy]

Most of the W-body guys prefer Gen 3's for boost. turbo 3.1s with 3x00 top end swaps are getting pretty popular.

- Justin

[project89]

well the gains on the intake on the gen 3's are hurt by the cfm loss on the ex side.so im sticking with my gen 2's i can get my intake side to flow the same with a simple valve swap to the same size valve as the gen3.and my ex side already outflows the gen 3.there out to be ported and remachined for .650 lift
/and ls1 valve springs/and sbc studs installed so i can use my full roller 1.6 rockers on them.