96capricemgr

iTrader: (1)

What was wrong with that test?

JakeFusion

iTrader: (7)

I realize the ETP > PI > Mast evolution has probably come with tweaks to the original ETP design, but if the test was conducted in the manner it was presented, I would think it provides at least one data point for comparison.

v8pwr

iTrader: (19)

If you can get a good deal on ETP/PI/MAST heads jump on it. They make great power very easily. That test showed an improvement but doesn't show the whole picture. Any high quality cylinder head (AFR, TFS, AI, TEA) coupled the appropriate parts and set up correctly will make power. Utilizing the correct parts to maximize this is key. Christian's build shows what can be done as well as those shown by Mamo, Tooley, and Phil over the years. I'm using ETP 240s and FTI for a reason.

96capricemgr

iTrader: (1)

In other words since the result wasn't the one you want you will give no credibility to the result.

I will agree the dyno doesn't tell a complete story.

Far as valve events not like this was a big rectangle head vs. a cathedral and hell one of the magazines tested that often benchraced item and found it to not make anywhere near the difference the pro-rectangle crowd pretends it does.

JakeFusion

iTrader: (7)

My take-away from that test is that the PI 215s aren't really worth the price premium over the AI heads. Really no head is. Even in the magazine tests that show AFR 245s, TFS 235s, PRC 237s, etc... they are all within like 5HP of each other. And that was on a 416 in GMHTP. Even there, TEA Stage 2 LS6 heads weren't down to any of those aftermarket castings, which included a MAST head.

Once you get to a certain point, a 346 can only move so much air (making the comparison even more restrictive vs the 416 in the magazine test). Power then becomes about the cam, headers, and intake combo and the attention to detail.

Paying a premium over ported stock castings from AI or TEA never set well with me. And I'm not afraid to spend money on my car. I just don't like spending money for the sake of spending money. So you see what I went with...

For the price of just the MAST heads (or just about any aftermarket head), you can get into AI/TEA heads and a FAST intake and it will certainly outpower the MAST/AFR/TFS heads with an LS6. Hell, I'm not sure with a FAST that the aftermarket heads will really and truly outpower the TEA/FAST combo. But, if you have specific needs, like a thicker deck for nitrous/boost or want a smaller combustion chamber or more PtV... the aftermarket castings provide those advantages. Whether or not it's worth the money is up to you.

Going with a Victor, Hi-Ram, or MAST intake might change things, but with an F-Body, those intakes involve a lot of hacking of the car to work. Vettes can get away with it if you're using a different hood. And to me, that would warrant serious consideration...

Rise of the Phoenix

iTrader: (27)

I'd be willing to bet that Dave can get these MAST 215's for less than what getting a set of heads ported by TEA or AI costs. Just saying.

dr_whigham

iTrader: (49)

Lol. It would be close.

If you consider me grabbing core 243/799's, shipping them, opting for turned down LS3 valves and all, then yeah, it's close.

I know the springs are duals, but not sure if it's the .650 kit or the nitrided .700 kit. It does have the Ti retainers though.

As stated, they have the upgraded hollow stem intake valves, and Inconel exhaust, which is perfect if I ever go with a serious ECS kit down the road. 10rib or bust!!!

I'd run them with a 102/102 combo for the time being, and enjoy it.

There's absolutely a possibility though of going with a Mast 4150 setup and a hi-rise hood in the future. Just depends. That would warrant a cam swap as well...

Rise of the Phoenix

iTrader: (27)

Looks like either way you go, those heads will suite you well. Are they milled at all?

Rise of the Phoenix

iTrader: (27)

I'll also leave you with this:

http://www.ls1gto.com/forums/showthread.php?t=74770

https://ls1tech.com/forums/dynamomet...o-numbers.html

red fury

iTrader: (1)

If Mast, TF or AFR fit in your budget go for it. You get what you pay for Is worn out but still stands true. I have a pair of these Mast 215s going on my 347ci build as we speak.

JakeFusion

iTrader: (7)

Those numbers aren't much better than what Dave had with AFR 205s... if he had stepped up to the StreetSweeper, he would have been in the mid 470s.

It just reinforces what I said. The difference between good heads is marginal at best. The C5 will dyno better than an F-Body... the IRS eats less power.

427zm

iTrader: (9)

Dave, you've been doing some FI research! 600+ wheel or bust! Centri's are packaged great for our cars!

Rise of the Phoenix

iTrader: (27)

The point I was trying to make is that they are proven heads that make killer power with the right cam. These heads will be an improvement over the AFR heads just because the intake runners are larger, which will go well with a relatively big Ed Curtis cam. I agree with you though that the difference between heads is minimal on a 346ci engine. But, since he's getting them used, he'll be getting a better deal.

macca33

dr_whigham

iTrader: (49)

Weird seeing this thread again,

Mast is having a good sale right now on their cathedral 225's... just throwing it out there. 11* valve angle as well..

https://www.mastmotorsports.com/coll...-cylinder-head

JakeFusion

iTrader: (7)

Those MAST 225s would make killer heads on a turbo 383...

G Atsma

Mast makes good stuff, but their heads are overpriced, even as good as they are.

sjsingle1

iTrader: (1)

silly me....why are 11 degree valves better ?.....whats the stock angle ?

G Atsma

Stock is 15 degrees. 11 degrees allows for the valve to piston clearance to get closer for long duration cams, and it allows for a smaller combustion chamber.

wannafbody

iTrader: (2)

But that change in valve angle requires special rocker arms doesn't it?