Mitch383LT1

what would be the best combination to build a 468 to spin 8000rpm?

Paul Huryk

Why 8000rpm?

s346k

iTrader: (4)

deep pockets if you'd like to do it more than once..

HioSSilver

iTrader: (8)

probally ditch that boat anchor for a LS would be best

texas94z

You're an idiot.

Parasoth

iTrader: (1)

Seriously? Get your LSx **** out of this subforum because no one cares for that opinion here. Calling a BBC a boat anchor is funny, because a mild BBC will **** on an LS1 when it comes to power.

To OP: Your gonna need to do a lot of research for that.
Lightweight/Ti valves,
Ti retainers,
Lightweight but stupid strong springs.

It's not just the 8000 RPM you have to worry about, its the combined weight of all those pieces at 8000 RPM. The heavier, the harder to control.

87chev4x4

light weight billet crank good rods either a promod style steel i beam or if it is just a race car aluminum and good forged dome pistons and a really good balance job and good clearances then good heads and alot of lift and duration

P.Wallnuts

If you plan on doing this regularly then a good valve train is difinetely the most crucial thing. As far as the bottom end is concerned though, a 468 will live at 8000 rpm all day. A four inch stroke is far from excessive in a big block. My 454 has seen 8000 a few times with a stock LS6 bottom end with just a windage tray in it. I'm also running a solid roller and all it has for valve train upgrades is crane gold roller rockers and a good set of valve springs and I haven't had a problem yet.

HioSSilver

iTrader: (8)

This is ls1tech right??? and I don't think so....I think you have that backwards. BBC=heavy turd

P.Wallnuts

Heavy is relative, that's more of a matter opinion but turd? ...not so much

3.8redbird

iTrader: (3)

Parasoth

iTrader: (1)

This is the SBC/BBC section of LS1 tech, don't like it? Get the **** out.

Weight doesn't mean anything when it comes to an engine making horsepower, only in getting it down the track for a faster ET.

I didn't mention ET, I said Horse Power.

A mild 468/489/496 BBC with aluminum heads weighs as much as an iron SBC, and usually make 600-700 to the tire on 91 pump gas.

I'm not even going to talk about a mild-wild BBC, or a race gas only BBC.

HioSSilver

iTrader: (8)

I always thought et mattered more than hp

P.Wallnuts

The extra power potential due to the shear size of every part of the motor more than makes up for the extra 75lbs. compared to an iron LS motor. Even if you want to make the arguement that the weight difference compared to an aluminum block is over 100lbs, the difference in power potential is even more.

HioSSilver

iTrader: (8)

You would be looking at almost 300# over a aluminum ls.

P.Wallnuts

An aluminum head/intake big block weighs about 550# and an aluminum LS weighs about 450 (give or take a little on both), so where's the 300# difference?

HioSSilver

iTrader: (8)

A aluminum ls comes in at about 365# with oe parts, engine only...fyi....I think your a bit optomistic on your BBC weight. So 200#

topend

you could get an all aluminium bbc

HioSSilver

iTrader: (8)

They were very rare. A iron bbc is 685#. Aluminum heads + intake drops that by 90#....according to my research

P.Wallnuts

I've seen from 385-430, I guess it depends what's on it for accessories but that would put the iron block at at least 450 I guess it depends on what accessories are on it. Personally I'll take the weight but whatever, I'm not trying to knock the LS motors at all they both have have their advantages. I'll agree to disagree because we've gotten a little off topic, the original question asked was about reving a 468 to 8k.