novaflash2002

iTrader: (51)

Well im in a bit of a delema. I have two optiions that i will be doing for myself finaly but cant decide what to do. I would either build a 421 (which i already have everything minus machining done) or a stock bottem end lq4 with some bad *** after market heads (thinking darts or trick flow). In the end it will cost the same. the reason i am starting a little poll is to see how may guys have or have had problems dding their stroker. I drive my car about 25000 miles a year. about 50/50 as far as intown and hwy. most of the intown miles are 15 miles one way. Im not worried about cam specs just seeing what would be the best. O and its going into a gto with an auto. thanks

Fbodyjunkie06

iTrader: (10)

421 with ported l92 heads and a ported L76 intake manifold with a nice 232/236 60x/60x 112 lsa cam would get you very close to 500 rwhp I'd say if not a reasonable 470-490. And if you wanted a smaller more DD friendly grind a 228/230 or 228/228 58x/59x on a 114 lsa. I think that would still net you very close to 475 still with that setup and I think thats still a little low depending on the dyno you use and it will all be in the tune too as to what you make in the end.

Just saw it was an auto I'd say a Yank or Vig 3600-4000 stall for the bigger grind I mentioned and a 3200-3600 yank or vig for the smaller grind would do nicely on the street I'd think. Don't forget a good tranny cooler you'll need it.

novaflash2002

iTrader: (51)

nice info, i would probably stick to 5.3l heads that i will port myself (done a couple) put 2.02 1.60 valves in.

keep it coming.

MelScrilla

iTrader: (2)

i like the 421. will the 5.3's flow enough to feed a 421

novaflash2002

iTrader: (51)

just a decant power street engine. im not looking for a race engine and yes i have got over 3xx cfm on the intake and 2xx cfm on the exhaust with 5.3ls at .600 lift

one fast zo6

iTrader: (490)

the more torque the better in a heavy GTO the more ci the better, but
you know that!!!

Bader-X

iTrader: (2)

I vote stroker


the reason:
370 with aftermarket heads (not LS7 or very large ports ones) with X compression and set up specced cam
vs
421 with stage 2-3 243 from the popular and proven vendors/L92 stock or ported with the same X compression and a set up specced cam

I say 421 wins and if the price is the same would like to be driving the 421 ^_^

{--- cooking 418 with PRC 2.5 317 (6.0 LQ9 heads) *because of +5 dome piston used short block

and if I were there in the USA I would`ve used PRC 5.3 2.5 if I didn`t have dome pistons and choose a piston according to my desired compression and money was an issue and looking for the best bang for buck ....or ..... use the hand ported or stock ones untill I can afford the heads I want

hope it helps and good luck with whatever you choose

novaflash2002

iTrader: (51)

i preaty much made up my mind on doing the 421. for the time being ill just put a smaller cam like a torquer 2 or 3 in, ill do up a set of 5.3l heads to bump up the compression a bit.