Astron 4g52 head work

[Drakes]

Hey guys about to take the head off my 4g52 (head is leaking oil down the back)

So while I'm replacing the head gasket I thought i may as well get the head shaved and raise the compression and get the valves re seated ect and also send the cam away to get reground for a more aggressive set up.

Has anyone gone down this track?

Would like to know your experience on what you raised the comp to and what sort of level cam was used .also will I have to run a double valve Spring set up?

[Ogre]

http://www.sigma-galant.com/

[dwlee]

Are you sure it's not the half moon at the back of the head that's leaking?

 

If your engine has a crank driven distributor the people on sigma-galant wont know much about it they didn't get that engine in Oz, but if its the later cam driven distributor engine then they should be able to help. Also, you could try contacting user "old colt" on http://classiccolt.forumcircle.com/ as he has experience modifying these engines back in the day. There is also a Dodge manual on what needs to be done to prepare these engines for racing and I'm pretty sure there's a link to it http://classiccolt.forumcircle.com/viewtopic.php?t=872

[RUNAMUCK]

I was in a mates parts loft earlier this week, and he had an Astron head up there that he'd sell. (And a Shiney as HPC coated stock exhaust manifold) 

/Ling post.

[bigfoot]

I was in a mates parts loft earlier this week, and he had an Astron head up there that he'd sell. (And a Shiney as HPC coated stock exhaust manifold)

/Ling post.

Astron 1? 2.6? I need one

[Drakes]

Are you sure it's not the half moon at the back of the head that's leaking?

If your engine has a crank driven distributor the people on sigma-galant wont know much about it they didn't get that engine in Oz, but if its the later cam driven distributor engine then they should be able to help. Also, you could try contacting user "old colt" on http://classiccolt.forumcircle.com/ as he has experience modifying these engines back in the day. There is also a Dodge manual on what needs to be done to prepare these engines for racing and I'm pretty sure there's a link to it http://classiccolt.forumcircle.com/viewtopic.php?t=872

Thanks for the reply .i have the crank driven version 52,can you tell me what the difference is other than the placement of the dizzy of course.

still waiting for my account on classic Colt to be activated.

I thought that could possibly be the reason but to be honest with how much room there is to see down the back I can't tell if it is the half moon or the head gasket..the oil that is leaking is very fresh.

Will look into those links though cheers!

[dwlee]

The main differences between the crank and cam driven engines a part from the obvious is that the earlier crank driven engines don't have balance shafts and they have different sized main bearings. The earlier engine cam with 3 different casting with the earliest have square inlet ports and the two later ones have round ports, but one having the inlet bolt pattern bolt pattern the same as the square port head and the later have same bolt pattern as the balance shaft Astron 1. Another difference is that the rocker cover of a balance shaft head wont fit on a pre-balance shaft head as the balance shaft head is longer. However, a balance shaft head will fit on the non-balance shaft block.

 

In my opinion having had both non-balance shaft and balance shaft engines in GTO's over the years the non-balance shaft engine is more powerful and responsive, but it isn't as smooth as the balance shaft engine.