I found out that I can get a big discount for Gm parts....

SO HOW ARE THOSE FASTBURN HEADS?????

They look pretty killer to me...the only problems is...I think I may have to change the cam that is already installed in the block ( XE 268 w/ 1.6 rockers) to something larger....HOW BOUT A HOT CAM????

Will the fastburn heads and the XE 268 produce over 425 hp.???

I'm not too sure if they would. Here's the other dilemma, if I end up going EFI, which I want to but am going carb until I get the cash together, is a computer setup going to accept this cam, or do I NEED to go roller???

The HOT cam is roller, right? I am shooting for approximately 475-500 N/A horsepower, will this do it??? 355 c.i. 4 bolt with 9.3-1 compression with 64cc heads ( fastburn is 62cc)

What do you guys think????Fastburn heads or something else??? I think I can get a pair shipped for under 800 bucks.

Do I need to change the cam, or what???

 

The fastburns are a great head. With the 268 and fastburns I'd think that 425 hp is possible with say 11.0:1 compression. If you are wanting close to 500 I'd say get some afr's 195's and a TPIS zzx cam. That way you can use the fuel injection later and be o.k. I do understand that you want to use GM parts but they do have there limit. Oh, you can get the fastburns ported to flow about the same as a set of afr's but you'll end up spending more money so that makes them not as good of a deal. If you do decide to go with the fastburns at least get the hot cam like you mentioned because of the flatter hp and torque curves. I think that you'd be happier.

 

Not sure they'll fit a 305 block, the valves on FastBurns are bigger than the usual 1.94/1.50".

 

This is for my new motor....355c.i. 4 bolt.

 

very nice head, i'd say you'll be more than impressed with them...

 

Just wondering if anyone can give me some flow #'s for these Fastburn heads. Just curious to see how they match up to trickflows and the like.

 

Well here's the flow#'s/...


243 on the intake @ .500
178 on the exhaust @ .500

This is pretty good but could be much better. I believe AFR's flow at least 255-260 on the intake and around 185 on the exhaust???

I would think these heads would still be pretty killer, especially if I gasket matched them for a few extra cfm's.

What do you guys think???

 

A flow number on the exhaust side of the head will vary on how you flow the exhaust. You can flow it with or with out a pipe, which is more accurate because it assumes the characteristics that a header tube will give you. AFR 190's flow on average about 194cfm at .600 lift wo the pipe and about 212cfm with the pipe. The fast burns flow 178cfm with open exhaust and around 185cfm with the pipe. The better head for sure is the AFR especially when you look at it's low-mid lift intake #'s, not to mention the exhaust. 240cfm at .400 is pretty darn good for any head.

 

I like the xe268 cam, BUT you won't see those hp numbers with it in a 355. The 268 does sound good, but there are a lot better out there. I have had that cam in my tpi engine for awhile now. Has great low end mid range power, but quits pulling about 5300/5500 rpm. If you want a cam for 6000 + the 268 is NOT the cam for you.

 

Yeah but you are running TPI, I'll be running a dual plane Holley "Contender" intake, which flows clear past 7200 rpms. I will also be using 1.6 rockers for a bit more lift, bring the lift total up to .509/.512...with a tad bit more duration. I want to be able to shift at around 6000, at least. I know for a fact that this cam can produce over 420 hp in a 350 with decent heads....I figure if I can really work the heads, along with a bit more lift cam wise, 450-460 hp is not out of the question.

 

I'm running a stealth ram! Go to comp cams website and look at their dyno charts on that cam. Sure don't show no 420 hp.

 

AFR's really are only like 150$ more.

195cc's are like $1295.

flow #'s

Lift Intake Exhaust
0.050 40 31
0.100 71 65
0.200 144 115
0.300 208 146
0.400 244 176
0.500 262 190
0.600 261 197

they make much more power than the fast burns.

Also might want to look at the Edelbrock E-tec 200's

cheaper than the fast burns, same design and make more power

Flow #'s

http://www.chevyhiperformance.com/ch...mage_large.jpg

 

From what I have learned, and been told, the fastburns are an awesome head.

 

I CAN GET THESE FASTBURN HEADS AT WHOLESALE, THAT'S WHY I AM LOOKING AT GETTING THEM!!!! MY DAD GET ANY GM PARTS FOR WHOLESALE B/C OF HIS SHOP!!! I AM TALKIN' AROUND $$$700-800 BUCKS FOR THE PAIR!!!

 

I have a pair of FastBurns waiting to go on my 409 (.040 over 400).

I've had them flowed twice, each time at a different shop. They flowed more than advertised. AND this was before I began to work on them.

They do leave something to be desired out of the box in the quality control department. Extra casting flash in many places, rocker stud heli-coils hanging down in the intake ports, and the chambers deserved more time spent on them, among other issues.

HOWEVER, nothing that can't be overcome easily. BUT, DON'T PLAN ON JUST BOLTING THEM ON!!! You WILL need to "slick" them up somewhat.

My biggest issue is the fact that your "normal" third-gen header WILL NOT PROPERLY BOLT UP!!!

The exhaust are "d-ports" &very large. In fact, my exhaust port size is considerably larger than the opening at the flange of my SLP 1-3/4" headers. I WILL have to get some large opening d-port headers.

The stock spring size is about 1.34" and really should be 1.55 but there is some areas that may not support a spring that large.

The intake ports are large (210cc) and have a very nice shot at the back of the intake valve.

Nice things about them are they can use a perimeter valve cover OR a center-bolt valve cover.

They also have a dual intake manifold bolt pattern.

Would I buy another set if starting over. Probably. I really like being able to say it's all GM.

Would I recommend them to you. At the price you can get them for---sure, go ahead. But, like I said earlier, there are issues to look at and DO NOT TRY TO JUST BOLT THEM ON!

jms

 

If your dead set on getting them then do so. GM dealer quoted me $750 for a pair should have gotten them to instead of the DART POS's.

 

HUH???!!!!!

SDPC part number SDZZ430B

430 HP, 430 LBS of torque

Compression ratio 9.6 to 1

Uses fastburn heads and a LT4 Hotcam

I am strongly considering a similar setup. I don't know if I want the Fastburn heads or Pro Lightning heads. The pro lightning heads flow better on paper, but who knows in reality.

 

I think a 274xtreme cam would be a better choice especially if you are wanting to make 400+hp. That cam is what everyone uses w/ vortec heads. Also thre has been several build up's in car craft recently using the 242/252 crane cam and making 420+hp with vortec heads. What that cam seems a little wild if people are doing the same thing with the 274xtreme cam which is 230/236.

 

LilJayV10 is your time 1/4 or 1/8? If its 1/4, is it street driven?

 

Well if you look at his speed, only 90.4 mph, there no way he is running 7's at only 90.4 mph. It would have to be fast maybe 170mph or so.

 

Yeah its in the 1/8, yes on pep boy radials and yes it's at 90mph. My car is street driven. It has overdrive and lock up. Except for gas comsumption. I could get in it and drive it to flordia and not hesitate. It's very streetable and very nice to drive.
again, except for the gas consumption, and I thought I drank a lot.

 

Don't have any numbers but the 274 is a sweet cam for the street.

 

What the hell are you so torn about?!? Get those damn fastburns for that price and be done with it!!!! Check out the innagural engine masters challenge. Beck took third place with almost stock fastburns because they are so efficient. The AFR's are better but not $800 better. You could touch the fastburns up and they'd flow like the AFR's and their c. chambers are just as good, except they need to be polished. The only problem is that you have to get an intake that matches.

 

I went with the Trick flow 23 degree heads after all. I got the 195 cc runners, 64cc chambers, springs good for .520 of lift and the CNC computer matched/ported chambers to boot.

For a few hundered bucks cheper than AFR I only lost about 5 cfm, but the combustion chamberes are 3cc smaller, so it works out for me.