427zm

iTrader: (9)

BTW Dave, I love the idea! A lightweight stoker bottom end is real cool. The LS7 bottom end can't be beat IMO. I think you will need to work hard to get a piston to work well with the rods to ensure balance and good light weight. To give you a for instance of the difference in pretty light and light, the LS7 bottom end is some 3# lighter than my rotating assembly! That's a ton! This is why you may see good power out of forged bottom end LS7 monsters, but great power is had with the stock rotating assembly. John B is pushing 680 wheel NA and that's with a completely stock bottom end. It light. Real light, and the pistons give you a total seal netting you more power.

427zm

iTrader: (9)

One last thing, with my buddy as an example, I believe with the right H/C setup and your light rotating group, 580 can be had. It'll take the right matched combo, but I feel it can be done. Get ready to enjoy 7k+ RPM shifts! They're great fun!

dr_whigham

iTrader: (49)

We'll find out where the intake, be it a stock LS7 or hogged out Fast, will start to fade.

I can't go sheet metal on this and kill my midrange. I don't want to shift the powerband TOO high. However some 3.90's are definitely in order...

I'm not sure about the cam from Chris. I had really hoped to get that from Ed. I'll be talking to Chris more when the time comes.

Jesus, I've still got to break the news to the wife. Or, I can just hide it really well

427zm

iTrader: (9)

As long as Ed and Chris talk about the heads and the cross sectional area, you should be cool. Martin talked with Chris on mine.

BTW, you're going to love spinning it high it's addictive!

As for the intake goes, we're seriously limited with vettes. The Fast 102 for the LS7's will definitely pick up torque under the curve, but it doesn't really show gains HP wise until you go with a big stick. I need one now with my current cam, and it'll be my next mod as soon as the wallet recovers some.

Also, with my current cam, Martin has showed (at least me) lifting it high on the intake side will promote good torque down low and give you good drivability even with a giant stick!

1989GTA

Vararam has a new intake coming on the market that should be interesting. Dual plenums and single throttle body. Should fit a Corvette. The components can be changed depending on the size of the motor and the modifications. Supposedly out late this Summer.

JakeFusion

iTrader: (7)

The LS7 intake is good for 7k+ on a 427... the 402 with small bore LS7s should still be good for 7500+ which is about as much as you want with a hydraulic roller. I think some titanium valves, CHE bronzed bushed rockers, and short-travel lifters are in order.

dr_whigham

iTrader: (49)

That's interesting... Research tomorrow, I will.

I'm happy I get to use the 1.8 rockers, but yeah, I want a cam on the "larger" side of the house. Only time I'm under 2500 is the interstate, and power is just a downshift away.

Ed will have no issue talking to Chris I'm sure. I asked Chis about hollow valves and he said as small as they are, it would be pointless. I trust him. But definitely Ti retainers (BTR kit)

Heads are high... But screw it. It'll be worth it.

Clutch will be from Monster. Just torn on the LT1-S or the LT1-SC twin discs...

And yeah, if the intake will keep up, I have NO ISSUE going 7400 or so at least. The pistons will be light too, from JE. At least I know which ones now... The 12*

427zm

iTrader: (9)

Spinning it is fun! Dave I get what Chris is saying, and you can trust him, he's a great dude... BUT you're not planning on taking the heads back off for awhile and you want to spin it high, so, if it was me, I'd lighten the valves as much as possible. Your bottom end will be setup to spin, you mine as well make the top end able to spin high with good valve control.

I also agree completely Jake! 7500 is about all you'd want to go IMO. That said, if it's making power, let it eat! You're going to love how power up top doesn't fall off... It just flattens out. No downward turn, the motor will just keep pulling... It seems pull endlessly

Also, I'm running Lunati link bars and they're well worth it. Morel's or Johnson's would be great as well IMO. Initially, I had LS7's in, but bleed down was terrible due to them being overwhelmed by spring pressure. They were noisy and I felt like at any moment, they (being the weakest link In my motor) were going to crater. Switched over to the link bars, and even though they're heavier, they're much quieter due to slower leak down.

dr_whigham

iTrader: (49)

What intake are you running, 427? I need to go as big as possible. Might even go speed density with this one too, after having it before. I really liked it.

I'm partial to Halltech, but I'm all ears. Currently running an aftermarket bridge and Blackwing now.

I'll do whatever it takes to maintain 100kPa at WOT

427zm

iTrader: (9)

For cold air, I'm running the Halltech LS7 intake. I also looked into the LG Carbon LS7 intake.

dr_whigham

iTrader: (49)

No issues with the bridge fitting over the radiator or anything?

90mm LS2 TB?

427zm

iTrader: (9)

Nope and that's with the Dewitt's Radiator. And yes, I'm using an LS2 TB.

Always2Slow

iTrader: (8)

I would suggest you splurge for the GM Titanium valves if you can afford it. Its only going to help the valvetrain.