bluedawg

I would think that fast burn relates to the chamber design and has nothing to do with the port. Dont get offended, if you like them then run them. With the valve size I'd think that for a 350 you might start to run out of rpms well before some of the other heads that use a larger valves, gm has even upped the valve size from 1.9" to 2" or so it would seem. Like I said they flow pretty good, just not my head choice.

bluedawg

I've not read a whole lot on the wet flow except that dart was doing it a couple of years back, something new to read up on and learn. IMHO it's not always the biggest and baddest that wins but more so the best planned out.

diehrd

The valve size was never altered it has always been 2.00 and 1.55
I was referring to the chamber maybe I messed up terminology ( thanks )

I mean no disrespect.

You have little knowledge about the fast burn head, other then what you might have herd or read in passing. Which is fine except when posting about them , you really should not be making a judgement because it is opinion based on false information.. Sorta like people who trash the Q-jet .. Until Lars stops into the topic.. Then peoples attitude takes a turn and suddenly a q-jet is a good carb which it is.

GM States with absolute and complete clarity .. The Following

"D" shaped 78cc exhaust port and runners provide adequate flow for applications well in excess of 500 hp. Raised runner (.240" higher than conventional 23? head) intake ports with 210cc ports and runners provide adequate flow for applications well in excess of 500 hp. Raising the top of the intake valves provides a better "line-of-sight" through the port and onto the back side of the intake valves.


Hollow light weight intake valve , sodium filled exhaust , bronze guides .... And how is that not a top tier head for a 350 ? Is it because it does not have 2.02 and 1.6 valve sizes ?

bluedawg

In your last post about these heads I seem Remember a 1.9 valve size, but I am getting old and suffer crs. 2" is defiantly larger than my fouled memory 1.9". Not much difference between 2" and 2.02". Like I said, you like them, your using them and what I'm more interested in what kind of times your vette puts down. My thoughts on the larger valves is in comparison to other heads with runners in the 210cc class that flow over 300 cfm. Think about it this way if you went to a 2.08" valve and opened the pocket to support the valve would they flow as well as dart or afr or brodix in that class with the same size runners and if they did what would they cost all said and done be, might be a cost effective way for building a 400" engine. When I say not my head of choice I'm at 400" now and don't figure I'll build smaller than that for a while and if my crappie memory isn't failing me now they flow way better than the edeljunks I bought on a budget and put on my l48 before I built my 400". I've changed phones recently and lost my book mark that Straub posted on flow numbers but I seem to remember them flowing as well as 180 eliminators on the intake but not as well on the exhaust which can be fixed by the camshaft.

cardo0

I dont need to google ZZ5 as i know the fast burns use a 2.00" intake. And even Stroker McJurkey with his bigger is always better ideas knows a big vlv, 300cfm, 210 or larger port aint what a 350 needs on the street for fun. Even GM performance has some huge small block heads for sale but u wont see'm on any of their crate engines. You see'm at the track and summit with sell u big heads all day long. Theres quite a few big cam, big headed cars that make goobs of power but are rarely driven because they ride like a 3 legged buffalo. Occasionally we have all seen one before - they lug and lurch sounding like they're going to stall at every stop w/o revving.

Again its a compromise of air flow and velocity for a given cubic inch displacement. I have a hard time listening to all the big runner, big vlvs, big flow numbers like a sales promotion. Head mfr's will advertize all kinds of numbers and dyno operators can produce big numbers for customers too. Reality test is the quarter mile and your seat of the pants feeling (actually back into the seat feeling). Cant really google that but u will see it for yourself if u go to the track and ask/see what others are running and see their times. U would be surprized how fast some good machine work on even stock heads and a smart combination goes.

diehrd

According to Sallee Chevrolet, the Fast Burn Aluminum is:
Lift/Intake/Exhaust
.1"/62/55
.2"/136/104
.3"/187/133
.4"/232/158
.5"/266/180
.6"/275/192

Perfect for over 500hp .. I ordered a dash cam 1080p .. Ill set it up and make a clip of how this motor set up runs , drives and performs.

bluedawg

Not everybody wants to build a 350 Cardo. I put 195s on my 400" because it's a street ride. I contemplated the 210s. The fast burns have a 210 runner if the average guy wanted to build larger than a 350" and didn't want to tie a fortune up in the cylinder heads it seems like a cheaper route to modify the fastburns, according to the numbers that die posted they almost flow what my 195s flow and use a smaller valve with a larger runner, why couldn't they be opened up with larger valves they'd probably flow more right, not probably what you'd want for a street driven 350" quite possibly what you'd want for a 400" or a little larger wouldn't you say?

bluedawg

They flow pretty close to the 195s. You plan on taking it to the track any? Looking forward to the video..if I had a go pro I'd do the same.

diehrd

I think the small chambers limit the heads ability on valve size , most bigger valve heads are 72cc and up and also have a bigger exhaust port 80cc .. I would not use the fast burns on a 400 and up .

But on this 350 i have I can not see getting much more out of it no matter the head or cam and still have total daily driving ability. I cant stress that enough. I get no cam surge or any abnormal condition in any gear at any speed. And if you sit in it with me and I pound it from a dig or a 20 mph roll your gonna be hammered into the seat and kept there all through the gears. And at the next stop sit there with a big smile

Not bad for using all GM crate parts.

cardo0

Reinventing the wheel is not the best way to build heads or an engine. That may have been the way when stock heads and parts were all there was or you could afford. Better now to choose from what someone else has engineered and tested and within your budget. These days every performance head mfr has a sbc head in at 3 different intake runner sizes and usually 2 different chamber sizes. Difficult enough to choose from them let alone modify'm. Changing and testing vlv sizes has already been done by the mfr. Most seem to think they know more than the head mfr's. And the cam mfr's too. Then they learn the hard/expensive way they are way ahead of themselves and left with bastard parts.

diehrd

I got the Camcorder for the car. SHould have read more on it the files size it stores are massive .. I had to cut this clip down .. into several parts . Anyone know where I can store and link to big video files ?

Here is a small one but I really would like to post basic driving and a full throttle pull in a few different gears .


http://www.mejuba.com/albums/diehrd8/246858/10765735/1

gkull

There are some good video editing software out there. Like Vegas or Sony which I use. You can compress and change the resolution or format from a 30 meg video to a 3 meg MP3 for posting like on youtube

diehrd

Ok cool .. .This camera takes 1080p video which is clear ,, I just need to shrink it down to internet size lol

diehrd

Here is a 8 minute video. It shows how well the motor drives in normal driving and it also shows a power pull. You will notice until I hit her it is pretty quiet. It has to be said , she is amazingly well behaved and has great street manners .. NO cam surge NO hesitations and instant power whenever you move the go peddle

Enjoy clip



ZZ4 350 CI base...
Fast EZ EFI
Single plane GM Intake 6.05 height
Fast Burn heads with PAC beehive spring kit ( 650 max lift)
GM847 Cam 238/242 duration 575/595 lift
1 7/8 XS Power stainless headers 4" collector
3" dual exhaust with X Pipe and Straight through mufflers.
700R4 with lock up
2400 stall
3.92 gears.

http://www.mejuba.com/albums/diehrd8/246858/10769484/1

63mako

Link won't open

diehrd

Hmmm It just did for me I wonder why ur having issues ..

C3 Stroker

......link won't open....wrong url link.....

diehrd

How about this link







http://www.mejuba.com/albums/diehrd8/246858/10769484/1

C3 Stroker

That's the same link.....still won't open.

7t9l82

i wonder coastwise the difference between a 520 H.P 383 and a 520 H.P 454 would be . seems the torque would overcome the weight penalty pretty easily.