I thought I read somewhere that stock runners were 186 cc. Not sure though.

 

It is 170cc for the stock castings. Anyways, those heads sure look very appealing. Someone needs to put some on their car soon, and let us know all about them...

 

what's the intake runner size on a LT4 head???

 

LT1s like high compression. 64cc combustion chambers are too big if you are going to put them on a car with the stock bottom end. If you throw these on a stock motor with a cc306 cam without milling them down you'll be lucky to make 360rwhp.

If I'm not mistaken, this is why they stopped making LT1 heads in the first place a few years back. Obviously they haven't changed much.

 

These heads will probably flow pretty good, but I am wondering how much low end they would cost you with a stock bottom end. Nitrous loves high compression, and these heads are going to take your compression down (not good). They may make a supercharged car run better but without a high compression bottom end or a supercharger they may not help that much.
Now the Edelbrock heads keep the same compression as stock, I want to know the flow numbers on them.
Just my .02

 

I bet these heads would be good for someone who wants to boost thier car without rebuilding the bottom end. If they flow well and lower conpression , wouldnt they be a great choice for a supercharged car ??? They on the site recommend them for stroked , blown , and juiced cars. Lower comp would lower risk of detonation on a juiced car running a very high shot of nitrous right ??? Maybe the reason these werent re-released till now is because of the limited application of these heads??? i wonder if another set is in the works for N/A stocker app's ???

 

well the low compression can be solved with a simple $30 mill job and you can have any combustion chamber size you want and any machine shop can do that in less than 1 hour. anyways id love to see the flow numbers on them as well thats where the power will be made or not made.

 

It's a pure shame to have a set of brand new heads milled if their are other options. I'm like alot of other people in this thread, I'm waiting for some numbers.

 

is that 849 for a single head or his that for a set of bare heads.

and i dont find this part number on there site. 3042B010

and i wonder if the seats are big enough to except a larger valve. say a 2.08 and 1.64

 

Ok guys i was at a shop a few weeks ago. I don't know if I really should be posting this, but Nick at Nu-tek has a set of these heads in his shop that was given to him by trickflow, they called him wanting him to test them out, They are just starting out with this head, if things work out, from what i have heard there will be diff heads made like bigger runners, and smaller chambers. Nick is going to e-mail me some numbers as soon as he gets them. They are flowing them and dynoing them as cast first, then a comp CNC port job will be done and tested again... hope this helps...

 

well what is messed up is that they are already offering them to the public yet cant answer a sipmple question

What do they flow?

 

Even if I could do that for $30 I still don't want to. I also don't want to buy brand new heads and mess with valvetrain geometry, intake manifold sealing, reduce the deck thickness, etc. When I'm ready for FI I can make the appropriate selection in pistons, which was going to happen anyway. So I can deck them, I'd just prefer not to

If they flow well I hope they release a set with smaller combustion chambers. Even slightly smaller than stock would be A OK with me

 

well i do see your point in that , perhaps they will offer the heads in any CC that you like, kinda like AFR and other companys do but you have to recommend that at time of purchase.

 

Another option to milling is to get a different head gasket

Stock LT1 - .049
Felpro - .039
Impala - .029
Mr. Gasket - .026
Copper - .020

If you've got a stock block with .025 on the deck, you'll need to reduce it anyways to take advantage of the quench. Drop to an .020 - .029 and you'll be better off. Plus you'll have heads if you decide to boost later or stroke your motor (396).

 

I was just being a hardass to get my point across I simply wish the heads would be more convenient. I'm already running a .026" compressed gasket which is getting beyond what you should be running on an aluminum head/iron block engine. It gets the quench down and raises the compression to something a little more acceptable for NA use, and so far it's worked fine.

I'd love to deck the block and blueprint the whole thing but that would require removal and complete teardown of the whole engine My car is a simple, stock bottom end car, with easy mods. I have to think that this is the largest market If I was designing heads I'd personally start by marketing to the bolt-on type crowd, not the full-blown engine builders.

As others have already said, it does no good to bitch about things before we even know the performance. Hopefully the combustion chambers are a little more active than AFR's.