Originally Posted by RobBeck

Update:
Spoke with Tony Mamo yesterday (really cool guy BTW), about this whole situation. He instructed me to measure the distance from the dowel pin alignment hole to the intake flange surface corner and to report my findings, ultimately this will truly tell how much material had been removed vs. a stock casting. My measurement came up to 6.060", whereas he says the stock UN-milled casting is 6.120" (he also calculated 6.070" for a new 54cc casting)... which seems to be correct by judging by some measurements of the block. Anyway, he said the problem is with the fact that I have 54cc chambers... which require 1* angle mill from the stock 76cc castings. That 1* apparently has caused the ~.060" material loss during the Intake correction procedure. I advised him my biggest problem is the port alignment with the stock LT1 Intake.... the ports are REALLY low and dont line up with the heads well (severe port matching required and even yet the Intake Manifold roof would be left paper thin/wouldnt seal). He said that I need to use the LT4 intake, that it has raised runners and will line up with my head runners unlike my stock LT1 Intake. So now I have to source an LT4 Intake, to try to confirm these new thoughts. Tony said that they recommend using the LT4 Intake with ALL of their heads (LT1 and LT4) because of such runner alignment issues. He also indicated that the bolts will ALWAYS be affected when doing an angle mill, requiring spot facing of the Intake manifold (or just ignore it)... I was under the impression that kind of stuff was all taken into consideration when I bought the heads. Anyway, the story as of now is the fact that I went 54cc and pretty much maxed out the castings is why I am having troubles with Intake Port alignment, etc. If the LT4 Intake Ports dont line up any better (the .100" raised runners I have read about will help ALOT), then its back to the drawing boards with AFR.

Rob

Originally Posted by ejfagala

That makes no sense. THey list the 190 (Not made anymore) and the 180 (New version of the 190) as LT1 heads and the 195's and up as LT4. I would think since they list a dif between the two that one would use LT1 and one LT4, they also state in the discription for the 195+ heads that a LT4 intake must be used.

Originally Posted by RobBeck

Update:Spoke with Tony Mamo yesterday.....Anyway, he said the problem is with the fact that I have 54cc chambers... which require 1* angle mill from the stock 76cc castings. That 1* apparently has caused the ~.060" material loss during the Intake correction procedure... I was under the impression that kind of stuff was all taken into consideration when I bought the heads.

Originally Posted by RobBeck

Tom Piper,

Out of curiosity what is your combo and do you have any performance data? Now that this thing is finally going back together would be nice to hear what I may/could be in for.

Rob

Originally Posted by arnie

So, whom did the machining to get chambers down to 54 ccs in the first place?

Originally Posted by arnie

WHAT? IF INDEED, TONY MADE THAT STATEMENT....That statement is NOT accurate. Tony may be a 'cool' guy, but doesn't know too much regarding the LT4 intake manifold, AGAIN, if he did indeed make that statement. Ports are NOT raised on the LT4 intake. If he claims to be familiar with the LT4 intake, I question his integrity. If his integrity is not at issue here, I find it sad the guy would know so little about a component he recommends, if indeed he recommended that manifold. (see below)

Port height of the two (LT1 and LT4) intakes, is identical. Doing a search will net you several posts/threads explaining the differences (rather lack thereof) of the two intakes.

NOTE: (also in archives btw) Intake ports of LT4 heads are raised, the ports of matching intake are NOT. The casting does ALLOW the raising of the port roof, by porting procedure, however.

Originally Posted by Tom Piper

I bought my AFR 190 LT1 heads with 54cc chambers, the chambers were done by AFR, about 1998. I have a stock LT1 intake with OEM intake gaskets. I looked at the match between the intake and heads before I bolted the intake on. I didn't notice any gaps in the two.
I've been running it that way for at least 30000 miles. No leaks or any other problems.


Tom Piper

Originally Posted by RobBeck

As stated about 20x in this thread already....

Originally Posted by arnie

The one problem I see, regarding your situation, is that the heads were bolted on and run the way they came form AFR. Otherwise, you could have sent back still new heads. AT THAT JUNCTURE, PERSONALLY, would NOT have accepted anything less than a correct replacement, or credit card payment would have been frozen. That is the way I am, like it or not. Don't know 'bout you, but I EXPECT, and WILL receive what I pay for. I will not be jerked around by 'questionable' dialogue. Again, like it or not, the way I am. I am a man of principle, and a man of integrity. If I am unable to receive a product backed by integrity, payment of funds is put in jeopardy. Credit card purchases have their advantages. If this was a rant, so be it. Again, wish you well.