99blancoSS

iTrader: (115)

I'll give you twice what you paid for the heads

PREDATOR-Z

LOL Blanco, shipping would run you as much. It is a steal by US standards. Z06 had frame damage and was totaled (passsenger side). Motor was unscathed so we yanked it out.
My buddy wanted the block for his dune buggy so he took those off. I was in his garage, I saw them collecting dust, we bargained and I took them .
Used market is not big around here and most do not have a clue on "special" items. To him they were just heads
About 8K miles on them.

JL ws-6

iTrader: (50)

Makes sense on the crank. Even with the heads, I'd still push that sucker to a 4.185 bore. You know it's gonna make a good bit more power, still ahve enough room for several rebuilds even when something gets eaten pretty good, and the cost of the pistons is about the same if not the same, just the aded machine time.

I'd go for it, those heads will probably work even better with a bore that size, chamber could be touched a little bit to unshroud the valves even more and the flow would probably pick up a good bit.

PREDATOR-Z

Frankly, initialy, I was thinking 4.200 bore for 401cid, but then as you mentionned I thought of the heads 4.125 bore and thought it might not be wise. I know I could open the chambers to 4.155 pretty easy (I opened my 5.3s to almost 4.0 bore, unshrouding the 2.04 valves for my 370 a bit).
Perhaps Eric K. might pitch in with some advice.

JakeFusion

iTrader: (7)

The LS7 heads like more bore to be honest... 4.185" or so. I would try that and run a 4.100" stroke. You can still rev into the mid 7-grand range with that bore/stroke and the LS7 heads without any problems, and you'll make more power. Port those LS7 heads and you'll want 450+cid with ~400cfm flow. Also, be sure to take the stock Ti exhaust valves, throw them in the trash, and replace with stainless exhaust valves for added insurance for $200.

racer7088

I wouldn't go super huge on the bore with a lot of NOS as there night not be enough left to fix things when they do go south. NOS has a way of generating rebuilds.

99blancoSS

iTrader: (115)

We've talked about the 4.200 bore plenty of times and the super thin gasket material between cylinders by that bore is not ideal.

Our 454 is a 4.185 bore x 4.125 stroke for this very reason. If it was a large power add engine we would not go beyond the 4.155 bore.

PREDATOR-Z

Thanks for chiming in. Yes my thoughts exactly.

I like that comment and it is so true, my guess, it has to do with charge distribution (direct port being more mercifull, part of the reason I will dump some $$ in that direction if I can) might need to invest in a FAST to do so (?)

I think I will stick with 4.155 bore for now.

99blancoSS

iTrader: (115)

damn I type slow.. He wasnt even online when I sarted typing..LOL and he still got his reply in 5 minutes before mine

Gen414

iTrader: (38)

Keep in mind that when you change cranks you are gonna have to change rods and pistons as well. Reason I say that is, earlier, you said that when you were ready to add cubes, you would only be a crank change away. Partially true, but you forgot to add rods and pistons to that as well, so just a reminder.

bagged36

iTrader: (1)

sounds like you are going to have a ton of fun

JL ws-6

iTrader: (50)

Honestly... the more I think about it, you'd be better off with your original plan, try to stay on the cheap and spend the $ you saved on a good intake, like the single plane Cary from perf. indoctions offers, and have it plumbed by someone that knows what they're doing and keep nothing but a fogger on the car, 2 if you can float it. Steve Johnson would be your best bet, get one fo cary's intakes, send that to Steve, have him put your nitrous system's on the intake and you'd be a TON better off in the long run I'm sure.

BlackNiteWS6

iTrader: (2)

Chris,
That 454cid must be a blast. No need for a blower..lol. I love cubes

Den

JPH

iTrader: (2)

Better seal and control imo. Gapless stuff that is. Usually worth 15-20hp more, and less leakage.

stumprrp

iTrader: (2)

sounds really cool man.

my406cid

Diggin up ftom the dead. Any progress on this build?