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The chamber wall is, in reality much taller than your drawing...if you do it right (chamber shape from the seat to the deck) the bore intrusion is no big deal honestly and it does make more power than keeping it tight like say a 4.080 gasket bore. I don't do this as much now as I've learned how...

Yes so far I've not touched it to get that power...I've also not build anything crazy with them...i.e. solid roller, high compression, etc...but I feel removing it using E85 may be proper...hopefully. I would love to try it but so far the power has been good leaving it in.

Minimum dur. @ .050 on intake around 254@ .050.

So far I've left the vane in, but if I ever do an E85 engine with them, I'll remove it.

I know for us, when we build a 408 hyd. roller deal, pump gas, I have to make changes to the intake porting on the TF head if we want more than 540HP. Those changes allow 575+ at a real 10.6:1 compression! And the port doesn't really end up flowing much more air...you have to remember the...

I would do a compression test to try and figure the compression before I ordered a cam, but I can tell you if the heads are not ported, it'll be slow. Also headers are too small for W2 engine, and the dual plane...big time power loss! I would install low gear set in the trans before changing...

Is that corrected HP or uncorrected?

We've made just under 580HP with them, using a hyd. roller cam! But they need work, they were not ootb heads at all. Compression was 10.7:1.

And the metal never seems to be the same again.

I port per application, so they're never the same most of the time. I can post some sheets if you want, won't tell much since I don't correspond the flow numbers with fps numbers on the same sheet but I can still post a few if you'd like. I don't think you do anything wrong with your porting...

When this kind of thing happen, I would try to make the Ferrea valve work more like the other valve in a sense. I suspect the valve job is what's doing this. Bowl %, throat, valve job (either biased or not), and chamber transition play a huge role in getting a fast port to play nice on a flow...

When this kind of thing happen, I would try to make the Ferrea valve work more like the other valve in a sense. I suspect the valve job is what's doing this. Bowl %, throat, valve job (either biased or not), and chamber transition play a huge role in getting a fast port to play nice on a flow...

Not enough info to really know for sure....what intake? rpm target? cam specs? compression? Back cuts? Port speed at .400-.500-.600 lift? exhaust? Really need to know everything about THAT particular engine...I've seen fast ports work, and not work...and I've seen slower ports...

Good power with stock heads!

Little 340 we did, unported eddy heads, rpm intake, kinda small .470 lift Racer Brown solid cam, 9.7:1, 750 carb...

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Do the pistons really stick up .065 above the deck????

Yeah I was thinking the same thing! TQ output is high for 12:1 IMO...

GZ Motorsports

Just ordered mine, will ship next week. They are staying on top of it right now.

I already do, but i only sell them on builds we do for now...I can't keep up with doing heads AND engines...I'm also working on some rocker kits for engines we build only for now, 1.65 ratio, cup adjuster, build around our import head (will also fit iron heads/edelbrock heads) and will work with...

The biggest problem with the new EQ heads are the seat insert on the intake (it won't take a 2.02 period! Not a correctly done 2.02 valve job anyway) and the fact that the spring seat can't be cut down .100 like the older version making it a low lift deal.

They can also do a 1.7.

I recommend removing the heads, and bringing pistons on each side of the block to tdc and measure them against the deck to see if they are above or below the deck and by how much.

If your 340 is mild, our import heads work really well. We sell them ready to bolt on.

Unless it's full on race build, and even then the -2 heads hold their own. If I hand port the -1 heads, they make more power but cost more too.

-2 Heads are better IMO...