y2kpewterz28

I own a 2000 z-28, t56 and all boltons i will be putting together an H/C combo with the LG g5x3 & afr 205cc heads. My questions is if i should go with the 255cc heads instead. The car is my daily driver and will be mostly a n/a car. Also, i know i want to upgrade to the ls6 manifold question is should i even consider the Fast 78mm manifold?
One more question, what should i be expecting when i dyno the car?

PREDATOR-Z

Hi Pewter,
There is no 255 cc AFR's. The biggest is 225 and I don't think they are out yet.
G5X3 and 205's should do nice but you have to ask Lou at LGM if you would need to flycut the pistons woth those heads (PV) clearance. IMO I wouldn't waste my time with the 78mm FAST. LS2 intakes should be out soon and should be a better product.
If you can't wait, just find yourself a 01/02 F-body manifold. It flows a tad better than the LS6.
Put all together that head/cam/intake combo should be awsome (Better be for the close to 4K you'll dish out)

11 Bravo

iTrader: (3)

The '01-'02 f-bod manifold is the LS6. No difference.The FAST seems to have proven itself now. It's all about money. As far as the 225 AFR's, they are supposed to be for strokers. The 205's seem to be the shi* for stock cubes, though it's still early to tell.

InsomZ

iTrader: (1)

ls2 + 90mm TB w/ that combo. curious to see how that would do w/ that combo

PREDATOR-Z

I beg to differ. They are different part#
Do a search and you'll find a thread on that topic. Put them side by side and you can tell they are not the same, (mouth brass bolts for LS6 (None in 01-02 LS1) minor runner volume dif. I'm talking minor like 2>3cfm flow dif.

Damage Inc.

iTrader: (7)

The G5X3 will rock hard with just a cam, but throw some AFR 205ccs on it and you're talking some serious power. I hope you plan on running a tonka truck tire. Ha. Also, as mentioned above, I'd wait for the LS2 manifold to come out and see which is better LS2/LSX.

algws6

iTrader: (3)

so is this the big suprize? you also might want to think about putting money away for a clutch and then a rear end because with that kinda power you are going to fry the stock clutch and 10 bolt.

Damage Inc.

iTrader: (7)

Oh fo sho. That 10 bolt is probably on it's way out NOW. Ha.

y2kpewterz28

thanks for all the comments guys i will let you know how the install goes and the before and after dyno runs!

pdd

iTrader: (3)

y2kpewterz28

Anybody with the G5X3 (112)/ afr heads or other heads tell me what kind of #'s your getting on the dyno/track?

y2kpewterz28

J-Rod, i just saw the vid of your vett, hope my Z sounds just as good!! when i get my install done.

WhiteDiamond

They are different part numbers because the Corvette uses drive by wire and the F-body uses the tried and true throttle cable. There are different bosses in the manifold to accept the throttle cable attachments....

Oh, 2-3cfm difference in flow can absolutely be within any percentage of error on flow. I highly doubt there is any F-body "mythical" super flow manifold.

Todd

PREDATOR-Z

Ok. So they are not the same. And 2-3 cfm is not super flow but nonetheless better.
Everyone always seems to treat F-body as Corvette surplus material (which is true to a certain degree).

JMBLOWNWS6

iTrader: (17)

I had the same question but I am not going to wait for the 225's. I am going to order the G5X3,AFR 205's with the dual spring upgrade ,double roller t chain,ported oil pump,and a asp pulley and see what it does. I have the money I was going to buy a blower but, I decided to go this route. I hope to order this within 2 weeks Good luck

SSactionLs1

There should be about 3 different ls6 intakes..all the same but different part #'s. fbody, zo6, and 03+zo6...

y2kpewterz28

Let me know how your install goes. Are you going with the 112 or 114 & is it stick or auto?

y2kpewterz28

im still waiting on my heads to come in. Also im gonna order my ls6 intake, hopefully the install will be done by the mid of this coming month. Any suggestions on what brand of timing chain to get. I call L.G. to ask about if i should upgrade my rockers or lifters they said stay with stock..... well saves me money.

PREDATOR-Z

For the lifters it depends how many miles on them. If too many for peace of mind (possible collapse with added pressure and higher lifts) you could replace with stock ones or Comp 850-16. There is also Crane LS1 replacements but they are 40>50 bucks more (I don't know if they are better than Comps.)

Damage Inc.

iTrader: (7)

I'm running a Heat treated Rollmaster Double chain. Works great, and is VERY beefy compared to stock.