usaf_hess

iTrader: (8)

what are the flow rates and specs for the stock 241 ls1 head? CFM, CC's and all that. just curious.

Paint_It_Black

iTrader: (1)

2 different flow sheets:

Chamber - 66.67cc - 0.100 - 0.200 - 0.300 - 0.400 - 0.500 - 0.550 - 0.600
Intake --- 200cc ------ 67 --- 122 --- 178 --- 215 --- 219 --- 223 -- 227
Exhaust --70cc ------- 52 ---- 97 ---- 133 -- 156 --- 170 --- 176 -- 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)


LS-1 Stock Flow Numbers (I think these are 241's)
SF600 3.900 Bore - 1-7/8 pipe

- Lift – Intake – Exhaust - %
.100
.150
.200 --- 136 ---- 108 -----
.250
.300 --- 196 ---- 145 -----
.350
.400 --- 217 ---- 170 -----
.450
.500 --- 224 ---- 186 -----
.550 --- 227 ---- 192 -----
.600 --- 230 ---- 198 -----
.650 --- 233 ---- 200 -----

Engine_HP

iTrader: (1)

what about stock zo6 what are the flow rate ?

Paint_It_Black

iTrader: (1)

Chamber 64.45cc - 0.100 - 0.200 - 0.300 - 0.400 - 0.500 - 0.550 - 0.600
Intake 210cc ------- 62 --- 126 ---- 184 --- 224 --- 251 --- 256 -- 257
Exhaust 75cc ------- 57 --- 108 --- 143 --- 163 --- 176 --- 180 -- 183
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12564243 (2001 +)
LS6 valves are 0.6mm or 0.023622" longer, hollow stem intake, and hollow stem sodium filled exhaust valves.

LS6: intake = 73 grams, exhaust = 65 grams
LS1: intake = 101 grams, exhaust = 94 grams.



also..

LS-6 Stock Flow Numbers
SF600 3.900 Bore - 1-7/8 pipe

- Lift – Intake – Exhaust - %
.100 –--- 62 ------ 59 -----
.150 ---- 94 ------ 86 -----
.200 --- 126 ---- 108 -----
.250 --- 156 ---- 128 -----
.300 --- 184 ---- 143 -----
.350 --- 206 ---- 154 -----
.400 --- 224 ---- 163 -----
.450 --- 239 ---- 170 -----
.500 --- 251 ---- 176 -----
.550 --- 256 ---- 180 -----
.600 --- 257 ---- 183 -----


Very consistant results from the 2 flow benches. Only a slight variance at .100 lift on the exhaust side.

usaf_hess

iTrader: (8)

Chamber - 66.67cc - 0.100 - 0.200 - 0.300 - 0.400 - 0.500 - 0.550 - 0.600
Intake --- 200cc ------ 67 --- 122 --- 178 --- 215 --- 219 --- 223 -- 227
Exhaust --70cc ------- 52 ---- 97 ---- 133 -- 156 --- 170 --- 176 -- 180
Valve Diameter Intake 2.00"
Valve Diameter Exhaust 1.55"
Part Number 12559853 (1997-98)
12559853 (1999-00)
12564241 (2001-03)


LS-1 Stock Flow Numbers (I think these are 241's)
SF600 3.900 Bore - 1-7/8 pipe

- Lift – Intake – Exhaust - %
.100
.150
.200 --- 136 ---- 108 -----
.250
.300 --- 196 ---- 145 -----
.350
.400 --- 217 ---- 170 -----
.450
.500 --- 224 ---- 186 -----
.550 --- 227 ---- 192 -----
.600 --- 230 ---- 198 -----
.650 --- 233 ---- 200 -----

the .value is obviously the lift and say at .600 lift the flow rates of the stock trim 241's are intake 230 CFM and exhaust 198 CFM?? am i reading that right? the intake and exhaust values are the flow rates CFM wise?

what is the SF600? and the stock cylindars are a 3.900 bore through 1 7/8 inner diameter exhaust manifolds? is the bore measure inches so its 3.900 what?

Paint_It_Black

iTrader: (1)

yes the .xxx value is valve lift.

The number under them is the CFM flow through the port at that given lift.

The SF600 is the type of flow bench they were flowed on.

The 3.900 is the bore size (different bore sizes will flow different CFM numbers).

The 1 7/8th is the pipe diameter on the exhaust port, like a header primary. Most heads are flowed with an exhaust pipe.

usaf_hess

iTrader: (8)

ok i was understanding that right the reason i am asking is cause when i purchasd my head and cam package i got the reworked 241 heads which have had a vlave job and there ported polished and fully cnc'd. the guy told me they flow right at 300CFM so i dont know if that both intake and exhaust(i need to ask him more questions) but i doubt it. the cam is .600 lift and 224 or 228 dueation and i dont know the LSA yet i still need to talk with them alot more. i lost the specs sheet i had lol if your wondering bad thing to do.

the kit is from Texas-Speed.com but i got it off ebay from trevor who works there and i paid like 1000 even for it.