LS1 stage II heads recieved today.

[DaleMX]

I ordered a set of stage II heads for the LS1 from Jay at Absolute Speed.

The order was placed in July and I recieved the heads today. 2.02 intake valves,

approx 11:1 CR. Casting number was 862 (4.3L truck heads).

 

I believe Jay has a new Superflow and used a 3.9" hole @ 28". The cam I'm using

has intake lift of .575 and exhaust lift at .565, duration at .050 is 230 intake and 224 exhaust.

The LSA is at 111.1 according to the cam doctor.

 

Here's the flow numbers:

 

.200 147

.300 206

.400 257

.450 277

.500 294

.550 307

.600 312

 

And some pics:

 

http://www.circuitflex.com/Chamber1.jpg

 

http://www.circuitflex.com/Exhaust1.jpg

 

http://www.circuitflex.com/Intake1.jpg

[Guest 240zJake]

Are those cnc ported?

[DaleMX]

Yes they are CNC ported then touched up by hand.

[Kevin Shasteen]

After the CNC porting - what size are the Intake Port cc's and Exhaust Port cc's?

 

Kevin,

(Yea,Still an Inliner)

[mas28O]

DaleMX With heads like these you should run 10's. I might put on some ported heads some day. How long until you have it up and running.

 

Mike

[Mikelly]

Those heads sound very nice... I'm hoping mine turned out as well... We had 2.02 valves installed and the heads were hand ported and should produce some nice numbers... Not sure what the flow data on them was, as Dave didn't let me in on that tidbit just yet... Will likely be in the build book he provides with all his motors.

 

Really interested in hearing how it runs... What intake and injectors will you use Dale?

Mike

[DaleMX]

Kevin,

Here’s the lowdown on the heads http://www.absolutespeedls1.net/ Most folk’s don’t like dealing with Jay because it takes him so long and he is impossible to get hold of. But from the results that I’ve read about with his heads I decided it was worth the wait.

 

The world of LS1 heads has changed recently in that AFR has a 205cc head and a 225cc, Edelbrock has a head they just announced, and Dart is coming up with one also.

 

Mas,

I hope to have it running in late December. I just have to get off my lazy a** and get some work done!

 

Kevin,

I am running an LS6 intake and 30# FMC injectors (actually 36# at 58 psi). The cam is a TR230 and I’m using a Janzer ported throttle body. I am also using a double row timing chain and a ported oil pump. The lifters are crane high energy, the rockers are Yella Terra 1.7’s, and the push rods are chrome moly from Thunder Racing. The clutch is a Spec stage II.

 

I just purchased some CV’s and I am going with the new CV kit that Ross has with the companion flanges.

 

The rear end is a stock 3.54, but I have a questionable (end play) 3.70 clutch LSD in the basement.

 

I have LS1 edit and have been working on the program a bit now and am feeling comfortable with it so with the proper guidance I hope to be able to tune it. Then the goal would be to go MAFless. They say it’s all in getting the VE table’s right.

 

My real challenge will be the headers. I really need 1 ¾†LT’s to make it work well. I have a feeling I’ll be using some block huggers from John for a while until I can find another solution.

[Mikelly]

SOunds very similar to my setup for the C5... I've got a shaner TB and a Z06 MAS. I'm thinking about ditching the Z06 induction setup for one of those FAST units... not sure yet... I also did the double roller timing chaing and ported oilpump, as well as the thunder pushrods... My whole valve train is from thunder.

 

Patriot has a good deal on Stage2 heads right now...

Mike 8)