That's great....now you have me thinking about another round of mods...which is a problem...my wife would prefer to put the $$$ in a 2010 GS....
But it is GREAT to see a big CI performance option for the LT1/4 guys


Mike

 

Well we dont like to cause domestic disputes but if we can assist anyone please let us know.

We're building one of these for a road race application right now for a customer.

 

ttt
bringing this back... excellent option to put a few LS1's/2/3 in their place

 

does this build require a reduced base circle cam, or can a standard (stock) base circle cam be used ?

 

Standard base circle

 

How about some pictures?

Do you use a crankshaft with smaller rod journals for clearance?
Are the main caps billet and are they splayed 4 bolts on all 5 locations?
Why isn't it suitable for FI and nitrous?
Which compressions height do the pistons have with the 6" rods?
Do the piston pin holes go into the oil ring groove?

What is the difference between your 408 LT1 and this one:
http://cgi.ebay.com/ebaymotors/LT1-S...Q5fAccessories ?

Regards
Rico

 

Do you use a crankshaft with smaller rod journals for clearance?
We prep the crank accordingly

Are the main caps billet and are they splayed 4 bolts on all 5 locations?
Splayed, only the three middle caps need them.

Why isn't it suitable for FI and nitrous?
The piston is compromised due to the stroke


Which compressions height do the pistons have with the 6" rods?
1.000
Do the piston pin holes go into the oil ring groove?
Yes like 90% of all 383s and up an SBC.

Now as far as your last question I have not heard of them nor has HKE who does a lot of engines for people in Dallas.

The components do not make an engine bullet proof and expensive internals do not make power on their own. Its the builder that separates one engine from another and tuning is crucial to any engine. A bad tune can and will destroy that $7000 short block just as easily as it destroys a $4000 shortblock.

We can certainly throw big money at internals same as you see in that ad but for what? This is a n/a application engine only as far as we are concerned. Callies Compstar is more than good enough. ( and would be the same for FI or n2o)

If you want me to build a $7000 LT1 shortblock I can certainly do that with a billet crank Oliver or Carrillo rods and it would make sense I suppose if your putting a $7500 top end on it as well and are going to be running it at 8500 rpms for hours on end.

But we like to put the money where it makes sense and does the most good.

If you want me to build you an LT1 boost or n2o engine we can certainly do that but it is not recommended on the LT1 408.

 

I think we have one of these 408s with some nice TFS heads about to start up in the next few weeks so I will post what it makes at the wheels when they do. It's in the New England area.

 

Thanks a lot for your detailed answer!

Do you have pics of your 408 LT1's?

You don't recommend FI or nitrous on your 408 LT1's. But member SonnyinVa runs a 408/409 cui LTx with a 300 shot of nitrous successfully in his C4: http://www.youtube.com/watch?v=y_0xDygXowg So it seems to be possible!?

What if this is nearly what I want? Which topend do you recommend for a high HP high revving version of your 408 LT1's?

Best regards from Germany
Rico

 

It's all about tuning and fuel.

We dont recommend it as 99% of the time it's a car that the variables are not going to be controlled properly.

I will pm you and we can talk about your specific needs and then come up a with a combination for your application.

 

ttt

 

I know you guys don't want to stick your necks out about somebody running nos, but I think it would easily take a small shot of nos. 100-150 shot. NOS says you can do that on a stock engine with cast pistons. But as a engine builder, I can see where they are at. A small shot of NOS would more than likely be fine if the tuning was good... just don't get carried away with it. And you would be on your own doing that.

 

ttt

 

Its still not on your website.
I'm wondering what it would cost for a long block ready to slap a flywheel on and mate it to my 6 spd. Also if you do a 383 what that would cost in a long block. Also if you have approx HP numbers so I can see which base class I'd fit in.

I road race mine so I'm looking more for longevity, torque.

 

Please keep us posted on this. TFS heads is what A.I. uses and they put out some amazing numbers! im curious to hear what they can do with at least 12 more cubic inches. although if most of those big power motors are done with a 383, then this would be with more than 25 extra cubic inches! LOL

 

Well I just spec'd out a long block at $12500 for someone looking for 500+ at the wheels. TFS 23* heads, HKE spring package to .700 lift
max effort hydraulic roller.

price of a 383 would drop a good amount for shot short block but the heads and valvetrain is where a lot of money goes no matter what if your looking to make real power.

 

Is a forged 408 rotating assembly offered for the LT1.

 

We can accomodate that

 

ttt

 

How much do they run and what kind of numbers can I expect... I am planning on using a le3 or ai top end kit with a port matched intake with a monoblade