ETP LS7 4" bore flow numbers
ETP LS7 4" bore flow numbers I just flowed our LS7 4" bore cylinder head, jut wanted to share the numbers with ya'll. We downsized the intake valve to a 2.125 and exh. to a 1.600. We also relocated the valve centerlines to maximize the radial distance around the valves. They will still use the stock LS7 rocker arms and intake manifold.
The valves are a touch longer so we could raise the spring pads to allow for any size/diamenter valve spring, even 1.650 dia. I think they would be sweet on a LS2 or 402 combo. I still yet have to cc the chamber and ports. The intake port volume was reduced from the original LS7. They exhaust port was also made to match up with existing ls1 headers/manifolds.
Intake = 2.125
.100 73
.200 154
.300 236
.400 287
.500 321
.550 336
.600 345
.650 350
.700 335
exh. 1.600
.100 56
.200 110
.300 166
.400 200
.500 215
.550 220
.600 222
.650 226
.700 230 271 with 1 7/8 pipe
thanks,
cary
The valves are a touch longer so we could raise the spring pads to allow for any size/diamenter valve spring, even 1.650 dia. I think they would be sweet on a LS2 or 402 combo. I still yet have to cc the chamber and ports. The intake port volume was reduced from the original LS7. They exhaust port was also made to match up with existing ls1 headers/manifolds.
Intake = 2.125
.100 73
.200 154
.300 236
.400 287
.500 321
.550 336
.600 345
.650 350
.700 335
exh. 1.600
.100 56
.200 110
.300 166
.400 200
.500 215
.550 220
.600 222
.650 226
.700 230 271 with 1 7/8 pipe
thanks,
cary
Staging Lane
Joined: Dec 2003
Posts: 51
Likes: 0
These will fit my 415 project 4.060 X 4.00 Cast Iron Block and I will be able to use the
TPIS headers that are bolted to AFR 205 heads Iam currently using on a 346 CID.
Iam going to be ordering MAhle Pistons - Let us know when you CC the Head
Chambers- These will utilize the LS7 Intake and Rocker Arms Correct
Awesome flow numbers
Pricing Thanks
TPIS headers that are bolted to AFR 205 heads Iam currently using on a 346 CID.
Iam going to be ordering MAhle Pistons - Let us know when you CC the Head
Chambers- These will utilize the LS7 Intake and Rocker Arms Correct
Awesome flow numbers
Pricing Thanks
Last edited by proautoman; Jan 14, 2006 at 07:36 AM. Reason: grammar
valves, cc I haven't cc'd yet, but the chambers will be around 70 on a 4" bore.
they will come standard with stainless valves. price will be around the 3000 mark complete.
they will come standard with stainless valves. price will be around the 3000 mark complete.
Could you post up stock LS7 head flow numbers in this thread for quick reference by any chance?
Also, I was looking on your site, and although the intake side of these flows better, the exhaust side of your 225cc 11* heads flows better at nearly all ranges. Any particular reason for this?
Also, I was looking on your site, and although the intake side of these flows better, the exhaust side of your 225cc 11* heads flows better at nearly all ranges. Any particular reason for this?
yes
Originally Posted by MeentSS02
Could you post up stock LS7 head flow numbers in this thread for quick reference by any chance?
Also, I was looking on your site, and although the intake side of these flows better, the exhaust side of your 225cc 11* heads flows better at nearly all ranges. Any particular reason for this?
Also, I was looking on your site, and although the intake side of these flows better, the exhaust side of your 225cc 11* heads flows better at nearly all ranges. Any particular reason for this?
it is a flow bench thing. we merely post flow numbers for exhaust ports because people want them. I can tell you that flow numbers for exhaust ports mean absolutely nothing. they are for reference only. but the reason they dont flow as good is because the valve is closer to the bore than on the 225's etc. The stock LS7 is the same way. this one actually flows a bit better than the stock ls7, as far as flow bench figures go.
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Originally Posted by cary et performance
yes,
it is a flow bench thing. we merely post flow numbers for exhaust ports because people want them. I can tell you that flow numbers for exhaust ports mean absolutely nothing. they are for reference only. but the reason they dont flow as good is because the valve is closer to the bore than on the 225's etc. The stock LS7 is the same way. this one actually flows a bit better than the stock ls7, as far as flow bench figures go.
it is a flow bench thing. we merely post flow numbers for exhaust ports because people want them. I can tell you that flow numbers for exhaust ports mean absolutely nothing. they are for reference only. but the reason they dont flow as good is because the valve is closer to the bore than on the 225's etc. The stock LS7 is the same way. this one actually flows a bit better than the stock ls7, as far as flow bench figures go.
On The Tree
Joined: Jan 2005
Posts: 112
Likes: 0
From: Boulder, CO
Originally Posted by cary et performance
they will come standard with stainless valves. price will be around the 3000 mark complete.
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
This isn't the 265 type head is it? I'm confused. Doesn't the 265/41 flow like 382cfm at .700 lift.
Is the 265/41 head better flowing than the LS7 type you're talking about for my 4.100 bore 436 stroker?
Is the 265/41 head better flowing than the LS7 type you're talking about for my 4.100 bore 436 stroker?
Originally Posted by Quickin
This isn't the 265 type head is it? I'm confused. Doesn't the 265/41 flow like 382cfm at .700 lift.
Is the 265/41 head better flowing than the LS7 type you're talking about for my 4.100 bore 436 stroker?
Is the 265/41 head better flowing than the LS7 type you're talking about for my 4.100 bore 436 stroker?
Originally Posted by NumberOneSled
Will these be the best heads you guys offer for a 4" bore?
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
Originally Posted by Beast96Z
This is not the 265cc LS1 type port. This is the LS7 style head they have set up for a 4" bore. Some people were wanting to use LS7 heads on the 408/402 ci motors, but the smallest bore they could go on was a 4.060". ET stepped up and made a small bore version for those guys wanting the LS7 heads and manifold for stock bore through 4.060".
I just realized it. 
Originally Posted by cary et performance
I haven't cc'd yet, but the chambers will be around 70 on a 4" bore.
they will come standard with stainless valves. price will be around the 3000 mark complete.
they will come standard with stainless valves. price will be around the 3000 mark complete.
Email sent sir.
Originally Posted by cary et performance
I haven't cc'd yet, but the chambers will be around 70 on a 4" bore.
they will come standard with stainless valves. price will be around the 3000 mark complete.
they will come standard with stainless valves. price will be around the 3000 mark complete.
If someone was to be building a iron block 408 should they go with LS1 style heads or is their advatanges to LS7 heads?
whats better
Originally Posted by GMH GTO
I notice your 4" bore LS7 heads flow roughly somewhere between the LS1 240 or 255 heads.
If someone was to be building a iron block 408 should they go with LS1 style heads or is their advatanges to LS7 heads?
If someone was to be building a iron block 408 should they go with LS1 style heads or is their advatanges to LS7 heads?