I am likely going with some of these as have nitrous kit and also going to think 383 or 396 when rebuild motor down the road a bit.
I have pretty mellow mods for now ,mac headers,CC305 ,1.6 pro mags,CAI, 58BBk,asp underdrive but would be interested in seeing any dynos using these heads. I understand they will drop compression right now any idea how much and if there is any gasket that I could use to have it not drop it that much. I don't really want to cut the heads as said they would likey be fine later with the 383 or 396.
Car is auto 96z with 2800 stall and 3.42 gears.

 

with a 62cc chamber on a stock piston it will have a significant drop in compression. Head gaskets will not make up the differance. Only way to do it is to mill the heads so the chambers are where you need them. You can build later using flat top pistons to help you out but you may not end up with the compression you want.


I'm running the TFS heads on my 355. I am running a domed piston and a .039 gasket. with a 63cc chamber the compression is back up to 12.4:1

With a flat top it would be down at 9 to 1 or so.

You will be better off buying a head when you build the new motor. Buying heads now and reusing them later may not get you what you want. Remember you can always mill them down but you cant go back

 

Let me get this straight going with the Trick flos will drop my stock 10.5 to 1 lt1 to 9 to 1? Just from the chamber size change? And running a .039 or whatever gasket won't help much .I don't think want to run under 10 to 1 right now and maybe go down later if did ever add a super or turbo but no plans to do that to this car. Doing that to my 99 ta and already have other turbo project cars. Am going to run spray maybe up to 150 shot. Does nitrous like a bit lower compression thought it liked higher compression? Can someone tell me exactly how low these heads will take my stock lt1 if I just bolt them on. and how much with different thickness of gaskets.

 

well an exact calculation is hard to do without having perfect numbers. But just bolting a set onto a stock shortblock will drop compression to about 9.4:1 with my math. (that might not be exact since I dont have exact figures to work with) Even with a thin head gasket you will not get compression back up over the 10.0:1 mark. You would need to have them milled to get the chambers back to 54cc's to keep compression at 10.5. You are correct you dont need lower compression for N2o.

The trick flow heads were not desgined to run on a stock shortblock in the as cast form. You need to mill em. Again, once you cut them down you cant go back if you need to for a rebuild later on. You might end up having custom pistons made. At the very least you will need to run a flat top later for compression purposes on the new motor down the line. Most people here will tell you to save your money if you plan to build later. Buy the heads later and not now. You will end up spending twice as much on them in the long run.