ForcedTQ

iTrader: (1)

Compression height on the pistons is the same. The 4.8 pistons are the same as what are used in the L33 H.O. 5.3 that GM put in the trucks in 2005-2007.

dug

iTrader: (10)

Does it require any balancing?

Killer5.3

iTrader: (1)

On your website the flow charts numbers don't match up with what you listed here. Which ones are correct? I have a chance to pick up a set cheap and want to verify flow numbers first.

studderin

iTrader: (28)

check the dates

Killer5.3

iTrader: (1)

http://static.trickflow.com/global/i...s%20vortec.pdf


It's their main current website. Above link is the flow chart from there.

A.R. Shale Targa

iTrader: (2)

Those numbers are with a 3.800" bore fixture and the original ones in this 4
year old thread were probably with a 3.900" hench the slight differences.
IIRC these also have powdered metal guides which are factory rocker arm
compatible. Trick Flow makes really nice stuff !!!!! PERIOD

4thgencaddy

I wonder how these genx 205 heads would act on a 6.0 or even a 402?? Does anybody have an idea on that. I know the compression would be through the roof because of those 58 cc combustion chambers

Exidous

iTrader: (11)

Lots of torque and great throttle response.

Necro ftw!

4thgencaddy

Sounds like fun I wanna try it now

Exidous

iTrader: (11)

It won't generate great wow numbers but would be a blast to drive around town. I've got a 346 right now and putting on Mamo 220 heads. (2 ish generations after the AFR 205's) and am thinking about sleeving the block down to a LS1 427. In 4" stroke form. Should make a TON of tq.

With a 402 you can tailor the CR with pistons. My 220's are going to be 60cc with a really nice tight quench. I'm really excited.

Darth_V8r

iTrader: (4)

I would expect them to have incredible midrange and possibly peak a little early on larger cube engine. You would need to dish the pistons. I think that genX 205 would make a phenomenal truck head

4thgencaddy

Did you mean 327 instead of 427?

4thgencaddy

So what would happen with those heads on a 402 with domed pistons and a thinner head gasket?? What would happen then???

Darth_V8r

iTrader: (4)

Spark knock, detonation, pinging. Call it what you will. Better run 110 or E85. Or Diesel

With a 5cc dome and 040" head gaskets on a 402 with a 58cc head, the compression ratio is 14.5:1. Using my cam for reference, the dynamic is 11.1:1! My engine has 10.6:1 STATIC compression

4thgencaddy

So if just using a 6.0 with a thinner head gasket what would be the compression on that I don't know the formula for the compression you gave me

Darth_V8r

iTrader: (4)

I don't know if this will help, but for the below, assume that we dished the pistons and have 11:1 compression. Here goes...

Larger cube engines have a higher appetite for air. If you take a head designed for smaller displacement and put it on a larger engine, it can breathe well enough in the lower rpms, because there is plenty of time to draw in air. However, at the higher rpms, it would quite literally starve for air - or at least go on a severe diet. You could compensate for this somewhat by using a larger cam, but in the end, the heads will only flow so much.

I don't want to hijack a trickflow thread, but I am more familiar with AFR and MMS. The MMS 220 was designed to optimize a 346 CI engine. the MMS 235 was designed to optimize a 400 CI engine. Tony did such a good job designing the AFR 205, that its still hard to beat on a 346. I'm sure someone more in the know on trickflow heads could substitute TF model numbers in there.

The need for more air is one of the reasons you'll see occasional threads where someone built a 408 bottom end, kept their heads from the 346, and ended up underwhelmed by the performance. It's all about the combination being happy together and working together (I can't see me lovin' nobody...)

Darth_V8r

iTrader: (4)

13.2 static, 10.1 dynamic (cam dependent). Still too high for pump gas. I would stay at or below 11.5 for pump gas. If you lose the dome, and go to a 5.3, you're at 11.2. Perfect truck head.

4thgencaddy

Oh ok, I was trying to figure out if I can buy some 205 heads and use em later because I want a 6.0 for sure later, because I have a 5.3 in my camaro now, but I guess I'm jus being impatient and cheap at the same time. I don't really care too much about rpm's over 6500 cause that's kinda to high I feel to daily drive so that's why I asked

4thgencaddy

I will jus save for the 245 416 or 402 that I want later or maybe a 427 or 454 if I can afford it, hehe.

Exidous

iTrader: (11)

No, I meant 427. :-) Resleeve the block. Run a 4.125" bore and a 4" stroke.

The 205's would be fine on a 6.0l. Bit small on a stroker.

You can find the 205's and 210 afr's in the classified section all the time. Even bnib for great prices.