Predator T/A

iTrader: (7)

what do stock lt1 heads flow with no work done to them

blkchevyz

car craft says 215 on the intake 154 on the exhaust.

i belive the lt4 was arund 240 and 170

Predator T/A

iTrader: (7)

is that at 28 in of h20 becuase i just flowed mine with some minor porting at 25 in and i got 188

NemeSS

iTrader: (127)

on the intake?
what the hell did u do?

Predator T/A

iTrader: (7)

well i flowed them at 25 becuase thats whyat they have the machine set at for some reason should be flowed at 28 this was at 550 lift also

blkchevyz

http://www.carcraft.com/techarticles/116_head_chev/

didnt say what they flowed them at but it seems like 28 is the standard

Predator T/A

iTrader: (7)

so at 28 they would prolly be better around 200 then

Predator T/A

iTrader: (7)

i think there was something else wrong becuase i had to rig the machine for the center bolt valve covers i am going to try it again in a few minutes

blkchevyz

is your valve all gunked up? im sure that would make a difference.

96capricemgr

iTrader: (1)

Flowbenches can be tough to use and EASILY manipulated. Would be far more useful to you had you flowed them before and after on the same bench that way if it is just the bench and setup causing the low numbers that would be repeated and the gains would be evident. Who knows maybe a stock head on that bench with that setup would only flow 160 we don't know.

Bore size, inlet size/contour, exhaust pipe being there and length and diameter, valvejob all have signifigant impacts on flow numbers.

Predator T/A

iTrader: (7)

i found out the problem ......the tranny dyno was running in the nxet room and they are on the same circuit......i flowed them today and they flowed 225 at 500 lift with stock valves i am getting the 2.02 next week......the tranny dyno was pulling to much juice and the flow bench was weak

96capricemgr

iTrader: (1)

Shouldn't be so quick to throw the biggest vavle possible in there. A lot of the GOOD LT1 porters like 2.0/1.56, part of this I believe is compatability with stock seats but there is also the pesky little fact that it works damn well.

blkchevyz

i agree... my heads are flowing 280+ and they only have a 2 inch valve.