Ok i want to get some heads for my car..its an 01 ws6 with full bolt ons and a cam but i have stock heads..it put down 420rwhp with the mods i have now..i want to get some et heads but they have such a variety im kinda confused..im guessing anything over the 215 heads would be overkill for my 346ci? if not what is? also im confused on all the options i can get..
heres some questions..do i need the custom factory rocker arm stand if i want to run stock rocker arms? and what is the 55* seat added to the heads is that woth the money? and also what the hell is the big exhaust option? sorry for all the questions..hopefully craig or someone can point me in the right direction..

 

if it was me i would call ET and tell them what your goals are for your car and they will tell you what will work best for you.as for the *55 seat,that is a *55 degree seat angle instead of the std. *45 angle,i think it helps flow in the higher lift range.i don't know about your other questions,just call them and ask.

 

Actually, I wouldn't mind seeing ETP reply and provide some of this information, I think a lot of us are asking the same types of questions. I have looked at their web site and come away confused not even knowing what comes with the baseline 215 head.

 

the 55 degree seat option is only intended for all out racing applicatons. They flow better in the higher lift ranges and increase the throat area with the same size valve by about 1-2 percent. It works better on the high port applicatons like the c5r and the LS7. what comes standard with the 215-265 is a 45 degree seat angle. 2.040, 1.570 valves and standard chambers are 62 or 72 cc chambers. we mill from there to achieve desired volume. also on the 215, is standard 3.900 bore. we can also use a 4.00 bore chamber when requested. I would like to see a 215 or 225 on a 346. 6.0 liter and 402 should use a minimum of a 225 cc. 215 will work, but may fade at a lower rpm. 245 cc will also work well on a stick shift 6.0 or 402. I will be going back to the dyno after I get back from the PRI show. We will be running more of the larger cylinder heads to prove out the myths and wonders. I appreciate the feedback from our supplied website info, this will help us make it more simplistic and informative. We will be filling a tremendous amount of backorders over the next few weeks. I appreciate the patience of the guys who have been waiting. I'm sure it will be worth it at the end. We just cannot cut any corners.

thanks,
cary

 

That's good to hear Cary. Sometimes you have to be patient to get one of the best products out. I deffinatlly wouldn't want you cutting corners on anything of mine. When I get my heads in, I'll send you the results from my M6 454ci. Should be on up there.

 

Cary, I read in recent post that these heads require some minor modifications to run. Due to the fact that they are a little taller the Fuel Rail Cover and the alternator bracket must be altered. The stock wires also become too short and must be replaced. This may only be for vette owners, not sure.

 

thanks for the reply, you helped me a ton..couple more questions..can i run stock rockers on the 215,225 heads, and also what about the pushrod length?

 

ttttt

 

yes, you can run stock rockers on any of the heads from 215 all the way to 255. the 265 does require the jesel rocker. the pushrod length will end up aroud 8.100.

 

I was told this is only for the Vettes. Not sure about the stock wires being to short though..

 

Cary
which one of your heads do you recommend for a iron 408? I`m putting it in the car in my sig with everything I have already. I`m going to spray a 200 shot also! Thanks!

 

use the 225cc

thanks
cary

 

Thanks bro. I'd like to hear from ET that this is definately an issue. If I'm going to shell out $2500 for heads I'd like to know ahead of time If I'm going to have to buy new wires, grind brackets and tie wrap my FRC's down.

 

If longer wires are needed just use truck wires they are about 1" longer.

Nate

 

like nate siad, the truck wires work great for length.

as far as the mods on a vette, I haven't seen one for myself, but from what I was told by Andy at A&A, if a shorter valve cover spacer is used the problem would not exist. we have addressed the issue on our castings and raised the valve cover rail a little more so the spacers would not be ness. These changes would not be seen for a short while for we have a lot of heads already done. The new castings will be avalible in about 6 weeks.

 

Cary,

How much can the 265 41 heads be ported?

 

Thanks Cary.

 

they wil go over 300 cc runner volume

 

I was wondering on how much the cfm could potentially be increased from the 367 @ .600 shown on your site. I want to flow as good or better than the LS7 head can, or I would just get the LS7 heads.

Will they work on my 4.100 bore, 4.125 stroke?

 

The ET heads out perform the LS7 heads right out of the box... I am curious to see how the ET LS7 style heads would work with an LS7 intake with a 4.125 bore...



Cylinder Head: G III LS1 11° Application: Street / Race
Port Volume: 265cc Chamber Volume: 35cc to 72cc
Test Bore: 4.100" Test Pressure: 28.00" Water
Intake Valve: 2.125" Exhaust Valve: 1.570"

Valve Lift Intake Exhaust Valve Lift
.100" 73 57 .100"
.200" 156 112 .200"
.300" 230 158 .300"
.400" 292 216 .400"
.500" 335 233 .500"
.550" 352 237 .550"
.600" 367 240 .600"
.650" 377 241 .650"
.700" 382 242 .700"
.750" 377 243 .750"

Exhaust to Intake Flow Ratio 68%

Jobber Price: $2,750.00 · Retail Price $2,995.00