Sigma-galant.com

One other question, what are those threads on the exhaust side next to the spark plug ports?

If you cut up a standard head you will notice that there is no water getting to the top near the exhaust ports this creates a steam pocket and contributes to the heads cracking in the exhaust ports so Paul pushes water in there to help with cooling the exhaust ports.
Billet rockers are easy and have already been done just most won't pay what they cost.
Camshafts is easy billet rollers can and have been made but once again most can't justify the cost.

Cheers Mic

If you dont mind, what would a set of mechanical billet roller rockers cost? For 1 - 10 sets?

I will talk to Paul and find out do you want them with elephants feet or are you going to source your own?

Cheers Mic

I was gonna stick with the standard lash adjusters. They work great for me and many others, I just want to go to Roller rocker lobes. I was thinking of just filling hydro rollers and drilling them out for the mech adjusters.

So impressive. I was blown away when I saw this thread!

Good news for us Astron Drag racers!

I have to go lie down now. My head is buzzing with the possibilities.

mic_77 wrote:If you cut up a standard head you will notice that there is no water getting to the top near the exhaust ports this creates a steam pocket and contributes to the heads cracking in the exhaust ports so Paul pushes water in there to help with cooling the exhaust ports.

That is a brilliant bit of foresight in the construction of these heads. So they need to have an external water gallery/pipe to thread into these?

You don't have to have it plumbed that way it is just there for added security in saying that most of Paul's setups now have electric water pumps so it is easy to plumb in 4 braided lines to push water in.

Cheers Mic

Hey Mic, has Paul had one of these running yet?

Very soon he is dummy fitting the motor at the moment to sort out the front engine plate, external oil pump, vacuum pump and fuel pump with a bit of luck it will be running in the next couple of months will be good to see what it does on the dyno.

Cheers Mic

Should be awesome. See what these bad boys can really do.

Hopefully all goes well and he can start pushing it hard.

I don't know how the C4 is going to handle it, might have to go turbo 400

Anything ever come of these?

rx22nv wrote:I don't know how the C4 is going to handle it, might have to go turbo 400

A good C4 will take anything an astron can throw at it !

I'm sure he wouldn't muck around if it wasn't worthy. I guess I just don't have much faith in them after a mate of mine had an expensive C4 behind his 20b (8 Second car) and it kept breaking over and over. Was a well known builder too.

https://www.youtube.com/watch?v=HwbMNTx76-U

Car is going Pro Stock Liberty 5 speed.

Thanks for sharing that link BACO13.
That is awesome.

Dave...