I have two sets of these bad boys being worked on now too.... Hopefully we will get some good results out of them. I'm interested to see what Phil gets out of them as well.

Starting with a 195cc port is pretty good since it will get into the right volume and cross sectional area for 383's and 396's once it is ported. Only bad thing is that you can't get a huge valve in the stock intake seat, but on a 4.030 bore that's not always the best way to go.

Bret

 

I saw this and was wondering why you werent the one to try those for him

 

I would have, except my heads were already en-route back to me when he posted this. My heads will work just fine :thumbup:

 

Bret are these heads still an LT1 port location or an LT4?
Steve...

 

They are standard LT1 port locations.

 

phil pick me pick me!!! heads and cam are next!!

 

Cool, thanks Chris.

 

well!!!! Any results yet???

 

Let me know what you guys will want for the heads after your done with them. I have a 383 short block all built and waiting for some heads. I ordered some AFR's for it and who knows if I will even get them this year. Thanks alot

 

I'm very interested in this. Plus you wouldn't even have to ship em I'm just down the road from ya.

 

Wanted to give you guys a quick update...

I haven't really pushed the casting as far as it will go, partly because I'm trying to keep it safe so I can sell it without worries, and partly because I've got no $ for the heads I have on hand. Since no one has bought or expressed serious interest in the TF stuff I have, I can't really allocate much time towards them.

Out of the box they did pretty good IMO, a little better than a GM LT4, and very close to what TFS claims on their site. The midlift #'s I got were slightly lower by a percent or two, but the 25Xcfm peak was right on. I think as-cast with properly honed guides & good parts they would make a nice street head, and that would give you the ability to run some of the more aggressive camshafts vs. running the parts that come on them from TFS.

After tinkering I have found that for whatever reason, they're going to be limited when it comes to porting because there are a few spots that are very thin as-cast, meaning under .100" I feel like they will be a good alternative to the GMLT4, and will offer similar flow numbers. With a 'safe' port they'll do about what a GMLT4 will safely - around 290/210. All guides will have to be honed to the proper clearances, which is a good thing IMO, as we can set that to whatever would be optimum, from .0006+"

When I have some more free time or if someone purchases these, I'll see about working around the thin spots a little better, but anything as thin as these are in certain spots tends to make me stay away from those areas with a grinder. If the castings are porous, they may very well leak, so though I'm certain I can get 300cfm out of them, I think figuring 285-290 safely will be fine. Of course, I'm going to have to talk with TFS about this & see if it was an inordinate amount of core shift or what, as I cannot imagine it was intentional.

SO... I think they're a good head for street applications, but if you want to make alot of power you should still look towards starting with something like a bare AFR for the time being. I also haven't had the chance to start seeing what I can safely do as far as lowering the chamber volume, so thats something else that will have to be done before I can really say one way or another what it'd be ideal for. Of course something with added displacement probably isn't going to have issues there .

Whenever someone seriously comes to us and wants them I'll see what they'll do .

Thanks guys!

-Phil


Oh, and Tracy, send me an email or give me a call please.

 

PM'd ya

 

Not bad, whats the cost of a set of GM LT4 castings oposed to these?

 

Is it truly going to be a dangerous situation to take these heads past 300 cfm??
I saw them and currently have a friend who is having his ported and was curious about whats all out for the LT1 as of lately...they do seem like a decent head though!

 

Sleeper,

I honestly don't know as I haven't had the time to really push them yet. I am simply wary of grinding anywhere near spots that are under .100" & sealing off water, as I have had several heads leak at .035-.045 due to porosity. AFR's for instance oftentimes have quite a bit of porosity, and these like them are another cheap street casting. I don't see 290cfm being an issue at all, which is enough air to make ~100hp more than what most guys want (~400rw/465flywheel). Based on flow tests done on piles of "300cfm" heads, I question whether or not people will get 300+ out of them safely or not, but I've no doubt people will say they will . Of course the particular set I have could simply have an inordinate amount of core shift or the thin spots are an oversight that will be fixed in future castings. It would be nice if that were the case

I look forward to seeing what they will do, and will probably eventually push one to the edge, but that may be awhile, as I can't honestly see it being worthwhile when it isnt something I'd be comfortable selling to people. I'll get to these eventually if no one buys them, but we've got so many new things we're working on for this winter than it's difficult to find time.

I've been getting a bunch of PM's etc. on these, and my boxes fill up quick, so if you guys wouldn't mind, use sales@ advancedinduction.com (remove space) for info on them, please

Thanks so much guys!!

-Phil