ET Performance flow numbers and impressions
11degree
Originally Posted by PREDATOR-Z
LS7 are 11 degree valve angle and require offset rockers, do these require the same?
Congratulations on getting your heads to the market, the LS7 stuff should be awesome. Are you still sending me a pair of your best 5.7 Liter/3.90 bore head to test? Congrats again to some of the best guys in the business.
BTW, I think I've got something for you
BTW, I think I've got something for you
No matter how well a ported CATHEDRAL head flows with radiused plate, moulded clay opening, or what ever. The cathedral type LSX heads air flow is limited/restricted by our OEM LS6, LS2, or Ported Aftermarket FAST intakes (Less cross section area?). Someone needs to DESIGN A NEW INEXPENSIVE HIGHER FLOWING INTAKE before designing another high flowing LS1,LS2,LS6 cathederal type head.
The above statement is why the NEW LS7 intake and head design looks way more interesting to me. Until then I choose to use nitrous with my stock LS1 cathedral heads
The above statement is why the NEW LS7 intake and head design looks way more interesting to me. Until then I choose to use nitrous with my stock LS1 cathedral heads
Last edited by gollum; Sep 16, 2005 at 02:03 PM.
Cary, quick question. Does rolling the valve angle back to 11 degree lengthen the port at all? If so it would also be good to note that 224 cc's in this head (ET Head) actually results in less cross sectional area then a comparable volume (CC) standard 15 degree ls1 head which means higher velocity relative to a standard 15 degree 224 cc head. Great work guys!!!
valve angles
Originally Posted by DAPSUPRSLO
Cary, quick question. Does rolling the valve angle back to 11 degree lengthen the port at all? If so it would also be good to note that 224 cc's in this head (ET Head) actually results in less cross sectional area then a comparable volume (CC) standard 15 degree ls1 head which means higher velocity relative to a standard 15 degree 224 cc head. Great work guys!!!
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8 Sec Tuner
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G-Force is proud to be an ET Performance cylinder head dealer! You guys can feel free to contact me for pricing information. These are some of the best cylinder heads available to the public.
how soon?
Originally Posted by ls1nos
how soon on the 255's Thanks
Originally Posted by cary et performance
we have all of our port and chamber models done and digitized. we are going to be achining 215,225,245,255 next week. we are shipping all of our 265 back orders along with some of the others next week.
I'm guessing with my hydraulic roller 408 peaking at 6300 I would probably want a 255. Are 11* always going to benefit power?
I've searched but not found this info anywhere, THANKS!!
Last edited by 383ss; Sep 18, 2005 at 08:41 AM.
rundown
Originally Posted by 383ss
what is the application that each runner volume is 'intended' for? that is a lot of options and a TON of configurations!! can you give a quick rundown please!?
I'm guessing with my hydraulic roller 408 peaking at 6300 I would probably want a 255. Are 11* always going to benefit power?
I've searched but not found this info anywhere, THANKS!!
I'm guessing with my hydraulic roller 408 peaking at 6300 I would probably want a 255. Are 11* always going to benefit power?
I've searched but not found this info anywhere, THANKS!!
215---mild 5.7 street stock style manifold 2.040 intake valve. 320 peak flow
225--- this will be the most common ls2 replacement and 5.7 for the guys that can get by the myth that 225 is too big for a 5.7. 2.080 332 peak flow
240--- this port is very universal, hot 5.7 but would work est on a power adder 5.7 or a 500 plus rwhp 402. I would at the least use a fast 90/90 setup with these, a carurator would be grat too. 2.080 or 2.100 valve is the option,
346cfm peak intake airflow @ .675 lift
255---this is our hottest cathederal port head using stock style rocker arms. it is very similar to the 265 but still has a restriction around the intake pushrod hole. 2.100-2.125 valve size. this head is good for a real hot 402 or larger, avalible with any bore size, it would be great on a 427 street car. this cylinder head peak flow is 360 at .675 lift. not too far off from the LS7.
265--- This a good large cubic inch cylinder head. or a very high rpm small cubic inch . this configuration uses a rocker arm system very similar to the c5r, the rocker arm boolt downs are moved to a c5r configuration and uses a 7/16 bolt down this head has seen the 380 cfm range, but is sensitive to valve shape and seat angles. most of our pieces come off the machine in the 370's which is still very stout. 2.100-2.125 valves are standard with a 1.570 or 1.600 exh.
hope this helps
BTW we are still developing our new intake manifold to really take advantage of these higher flowing versions. I hope to have a prototype at the pri show.
and for the corvette guys that have viper friends, we also have our new "Viper STRIKER" cylinder head avalible in october.
et performance web site Just to let you guys know that have been to our website and not found anything. We do have all of our flow numbers up there and our homepage has a pic of our LS7 head ontop of our 265 
www.etheads.com
www.etheads.com
awesome, thanks for the info. looks like I could possibly use a 265, but its going to be quite a bit more $$$ for not a lot of gain on my low rev motor. I'm sitting at 550rwhp now and have MAXED out my current 5.7L ported heads.
cool news on the intake, I had no idea on that either
cool news on the intake, I had no idea on that either
Originally Posted by cary et performance
215---mild 5.7 street stock style manifold 2.040 intake valve. 320 peak flow
225--- this will be the most common ls2 replacement and 5.7 for the guys that can get by the myth that 225 is too big for a 5.7. 2.080 332 peak flow
240--- this port is very universal, hot 5.7 but would work est on a power adder 5.7 or a 500 plus rwhp 402. I would at the least use a fast 90/90 setup with these, a carurator would be grat too. 2.080 or 2.100 valve is the option,
346cfm peak intake airflow @ .675 lift
255---this is our hottest cathederal port head using stock style rocker arms. it is very similar to the 265 but still has a restriction around the intake pushrod hole. 2.100-2.125 valve size. this head is good for a real hot 402 or larger, avalible with any bore size, it would be great on a 427 street car. this cylinder head peak flow is 360 at .675 lift. not too far off from the LS7.
265--- This a good large cubic inch cylinder head. or a very high rpm small cubic inch . this configuration uses a rocker arm system very similar to the c5r, the rocker arm boolt downs are moved to a c5r configuration and uses a 7/16 bolt down this head has seen the 380 cfm range, but is sensitive to valve shape and seat angles. most of our pieces come off the machine in the 370's which is still very stout. 2.100-2.125 valves are standard with a 1.570 or 1.600 exh.
hope this helps
BTW we are still developing our new intake manifold to really take advantage of these higher flowing versions. I hope to have a prototype at the pri show.
and for the corvette guys that have viper friends, we also have our new "Viper STRIKER" cylinder head avalible in october.
225--- this will be the most common ls2 replacement and 5.7 for the guys that can get by the myth that 225 is too big for a 5.7. 2.080 332 peak flow
240--- this port is very universal, hot 5.7 but would work est on a power adder 5.7 or a 500 plus rwhp 402. I would at the least use a fast 90/90 setup with these, a carurator would be grat too. 2.080 or 2.100 valve is the option,
346cfm peak intake airflow @ .675 lift
255---this is our hottest cathederal port head using stock style rocker arms. it is very similar to the 265 but still has a restriction around the intake pushrod hole. 2.100-2.125 valve size. this head is good for a real hot 402 or larger, avalible with any bore size, it would be great on a 427 street car. this cylinder head peak flow is 360 at .675 lift. not too far off from the LS7.
265--- This a good large cubic inch cylinder head. or a very high rpm small cubic inch . this configuration uses a rocker arm system very similar to the c5r, the rocker arm boolt downs are moved to a c5r configuration and uses a 7/16 bolt down this head has seen the 380 cfm range, but is sensitive to valve shape and seat angles. most of our pieces come off the machine in the 370's which is still very stout. 2.100-2.125 valves are standard with a 1.570 or 1.600 exh.
hope this helps
BTW we are still developing our new intake manifold to really take advantage of these higher flowing versions. I hope to have a prototype at the pri show.
and for the corvette guys that have viper friends, we also have our new "Viper STRIKER" cylinder head avalible in october.
TECH Junkie
Joined: Aug 2002
Posts: 3,726
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From: Fort Collins, CO
Originally Posted by jrp
i suggest you copy/paste this and keep it handy cuz i predict you'll be answering this question a TON in the future.
I would suggest cary et performance just starts a thread with the info even in more detail. head options also. what they expect out of the titanium valve option, the stage 2,3,4 spings, copper seats. I'm going to call and ask for my application, but I'm sure a lot of guys want to know what benefits all of those will give. and when they are most needed.