ET Heads info, thoughts, pics, numbers
Thread Starter
TECH Junkie
iTrader: (10)
Joined: Nov 2001
Posts: 3,944
Likes: 21
From: Glen Burnie, Md
ET Heads info, thoughts, pics, numbers These heads looked good on paper so we took the plunge, now Im very happy we made the decision to carry their stuff. Got the 225s in on Monday and picked them apart, figured some might like to know bout them:
Valves measured out at 2.08/1.60
Installed height on intake checked out to 1.80 exactly
Spring pressures checked out
140#s at 1.800
375#s at 1.200
404#s at 1.150
Will be checking free drop clearence on a few cams, probably vs stock heads as well. Should be getting flow numbers on a 4.00 bore, and hopefully a 3.90 bore if I can get one fabbed in time.
Build quality is SICK, each head is 9.8 lbs heavier then a stock head.
Steel inserts for the head bolts, nice even clamping force across the deck (which is extremely thick compared to stock)
PICs should be coming shortly just have to get them off the camera.
Valves measured out at 2.08/1.60
Installed height on intake checked out to 1.80 exactly
Spring pressures checked out
140#s at 1.800
375#s at 1.200
404#s at 1.150
Will be checking free drop clearence on a few cams, probably vs stock heads as well. Should be getting flow numbers on a 4.00 bore, and hopefully a 3.90 bore if I can get one fabbed in time.
Build quality is SICK, each head is 9.8 lbs heavier then a stock head.
Steel inserts for the head bolts, nice even clamping force across the deck (which is extremely thick compared to stock)PICs should be coming shortly just have to get them off the camera.
Last edited by GrannySShifting; Nov 22, 2005 at 09:31 AM.
TECH Addict
Joined: Jul 2002
Posts: 2,261
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Originally Posted by ZLEEPER
Which heads do you feel would work best with a 402 ls2? Definately would like to see some real world flow #'s. Tax season's right around the corner!
From their site :
Cylinder Head: G III LS1 11° Application: Street / Race
Port Volume: 225cc Chamber Volume: 35cc to 72cc
Test Bore: 4.000" Test Pressure: 28.00" Water
Intake Valve: 2.080" Exhaust Valve: 1.570"
Valve Lift Intake Exhaust Valve Lift
.100" 71 57 .100"
.200" 153 114 .200"
.300" 208 164 .300"
.400" 265 204 .400"
.500" 308 224 .500"
.550" 320 228 .550"
.600" 328 231 .600"
.650" 332 234 .650"
.700" 320 236 .700"
Exhaust to Intake Flow Ratio 73%
Site->http://www.etheads.com/mainpage.htm
Thread Starter
TECH Junkie
iTrader: (10)
Joined: Nov 2001
Posts: 3,944
Likes: 21
From: Glen Burnie, Md
I will have have those 225s on the bench in the next day or two. If you want email me and Ill let you know what I find. We have Absolute Speeds, GTP etc and some other well known heads done on this bench for comparison.
I would recommend the 225s for most street setups with a 402, dont think your going to choke it by any means being as they move more air then 99.999% of LS heads out.
If your looking to put together a max effort street setup then I might recommend a customer go with the 240s
I would recommend the 225s for most street setups with a 402, dont think your going to choke it by any means being as they move more air then 99.999% of LS heads out.
If your looking to put together a max effort street setup then I might recommend a customer go with the 240s Jeff, if you get my car done by Wednesday night I will let you throw in a free set of those ET 225's 
When's it headin to the dyno? I wanna be there for that. Let me know.
When's it headin to the dyno? I wanna be there for that. Let me know.
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Hummmm, I will probably have a set of 225's for sale sometime next year. They should be here by end of this month, and are slotted to be transitional cyl head, that is until the big bore & storker is finished.
Will be looking for your results.
Will be looking for your results.
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1.69" exhaust width is too wide for an 1 3/4" header. 1.60" is about as far as you want to push it, and only if you have the port centered properly. With that header, you are going to have port overlap into the primary. If you insist upon running that head with that header, you better have the primary ends taper ported for clearance.
Brandon
Brandon
