ETP 225/cam question
ETP 225/cam question I've made my decision and am buying ETP 225 heads for my stock shortblock. I would like to mill them to 59cc and run a .040 cometic gasket. Should put me around 11.3-11.4 compression. I would like to see what size cams people are running with the ETP heads. I want to make sure I have enough PTV clearence. I've tried a search but didn't come up with any combos like mine. I don't think I would go bigger than a MS3 or MS4. Thanks for the help.
You may want to consider the 215 head if you're planning on stock cubes as they flow plenty of air.
My ETP setup consisted of: 59cc's .040 Cometic's 11.8scr/8.8dcr, and a G5X3 cam which had plenty of clearance.....
My ETP setup consisted of: 59cc's .040 Cometic's 11.8scr/8.8dcr, and a G5X3 cam which had plenty of clearance.....
ETP 215, 60cc, pistons 0.004 out of the hole, Cometic 0.040, FTI StreetSweeper Camshaft high lift (.630...), SCR is around 11.45 acording to the calculation of Ed Curtis.
PTV Clereance
- Intake :-------0.110
-Exhaust :------0.130
NO FLYCUT
Knowing the head chamber volume is 60cc and the Cometic head gasket is 0.040 thickness and also that the StreetSweeper is a camshaft with some substantial duration and lift numbers , THOSE ARE IMPRESSIVE CLEARENCE NUMBERS...
Christian
PTV Clereance
- Intake :-------0.110
-Exhaust :------0.130
NO FLYCUT
Knowing the head chamber volume is 60cc and the Cometic head gasket is 0.040 thickness and also that the StreetSweeper is a camshaft with some substantial duration and lift numbers , THOSE ARE IMPRESSIVE CLEARENCE NUMBERS...
Christian
Last edited by miami993c297; Mar 4, 2007 at 01:19 PM.
The car is a nitrous car. ETP recommended that I go with the 225's. They flow much better on the exhaust. I wonder how much the bigger valves hurt PTV?? I think the 215cc has a 2.04 intake valve and the 225 has a 2.08 valve. The 225 cc head is still not a big head for a 346. Look at factory ported castings. They usally end up being over 230 cc's just from porting. I also plan on going to a bigger bore in the future. Either a 370/turbo setup. Or a 402/nitrous setup.
We hope to make some good power with his up coming setup.
INTMD8 will be looking into some custom cam choices Mon-Tuesday. We where just looking for some feedback with others running a stock shorts and larger cams.
There are the back and forth stories as with any combo that 225's have way less PV then a 215. We are ware they have larger valves and can accept some loss. I will call and speak with Craig or Cary Monday to go over the PV issue that some state and others have no issue.
We have yet to do a larger cam with an ETP head on a stock block 346, so hope to see some good numbers soon
car goes 10.2 now with 150 shot, 23x/23x cam , STG 1 stock valve LS6 head , smashed up Macs ( cheap conversion setup ) @ approx 3400 lbs.
ETP heads, Custom Cam and Hooker LT's should really wake the ride up lil bro
INTMD8 will be looking into some custom cam choices Mon-Tuesday. We where just looking for some feedback with others running a stock shorts and larger cams.
There are the back and forth stories as with any combo that 225's have way less PV then a 215. We are ware they have larger valves and can accept some loss. I will call and speak with Craig or Cary Monday to go over the PV issue that some state and others have no issue.
We have yet to do a larger cam with an ETP head on a stock block 346, so hope to see some good numbers soon
car goes 10.2 now with 150 shot, 23x/23x cam , STG 1 stock valve LS6 head , smashed up Macs ( cheap conversion setup ) @ approx 3400 lbs.
ETP heads, Custom Cam and Hooker LT's should really wake the ride up lil bro
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I'm a couple months ahead of you guys.
I pick up my car today. Install is being finished at this moment. I dyno on Friday.
Setup is ETP 225 small bore heads. 58cc, compression around 11.8:1. I am not sure about the valve size...I thought with the 3.90 bore the valve size was the same as the 215's? Maybe I'm wrong. Cam is the Streetsweeper, just like Miami99 went with. I am not sure how much PTV clearance there is...I WILL LET YOU KNOW ASAP!
BTW, I also went with the 225 heads because I am planning on spraying...not until 2008 though.
This year is all motor runs. I'm hoping for 10.49 stock bottom end NA.
I pick up my car today. Install is being finished at this moment. I dyno on Friday.
Setup is ETP 225 small bore heads. 58cc, compression around 11.8:1. I am not sure about the valve size...I thought with the 3.90 bore the valve size was the same as the 215's? Maybe I'm wrong. Cam is the Streetsweeper, just like Miami99 went with. I am not sure how much PTV clearance there is...I WILL LET YOU KNOW ASAP!
BTW, I also went with the 225 heads because I am planning on spraying...not until 2008 though.
This year is all motor runs. I'm hoping for 10.49 stock bottom end NA.
Originally Posted by PewterZ28
I'm a couple months ahead of you guys.
I pick up my car today. Install is being finished at this moment. I dyno on Friday.
Setup is ETP 225 small bore heads. 58cc, compression around 11.8:1. I am not sure about the valve size...I thought with the 3.90 bore the valve size was the same as the 215's? Maybe I'm wrong. Cam is the Streetsweeper, just like Miami99 went with. I am not sure how much PTV clearance there is...I WILL LET YOU KNOW ASAP!
BTW, I also went with the 225 heads because I am planning on spraying...not until 2008 though. This year is all motor runs. I'm hoping for 10.49 stock bottom end NA.
I pick up my car today. Install is being finished at this moment. I dyno on Friday.
Setup is ETP 225 small bore heads. 58cc, compression around 11.8:1. I am not sure about the valve size...I thought with the 3.90 bore the valve size was the same as the 215's? Maybe I'm wrong. Cam is the Streetsweeper, just like Miami99 went with. I am not sure how much PTV clearance there is...I WILL LET YOU KNOW ASAP!
BTW, I also went with the 225 heads because I am planning on spraying...not until 2008 though.
This year is all motor runs. I'm hoping for 10.49 stock bottom end NA.Congrat on the (unusual) combo choice, that was an option from Ed for my ZO6, but as a shy guy I asked him about beeing conservative...
Waiting to hear about your results
Christian
Well today was a roller coaster of a day. At one point there was zero PTV. Attempt two at degreeing the cam resulted in .047 PTV. Finally, attempt 7 or 8 resulted in the cam being degreed as called for and .130 PTV. However, my mechanic said .050 of that is lifter plunge so realistically there is about .080 PTV.
There are a few reasons it took so many attempts to get the cam installed right but the main one is the darn timing chain a la Aussie style.
The instructions showed how to install a 24 tooth or a 20 tooth but this one had 22 teeth. 
At 0 the cam was installed at 106. Well we wanted 109. -2 still resulted in 106, -4 still resulted in 106. Then -6 it jumped to like 114. I know enough about high performance to make smart purchases but I have never had to degree a cam in my life so I don't even know if I just said all of that right. The only two cams I have ever installed called for dot to dot so I didn't have to worry about all of this. Next we tried +2, +4 +6 and finally +8 which resulted in the 109 the cam called for. I'm sure I said some of this wrong and I'm sure some of the numbers are wrong but long story short, the timing chain caused a ton of trouble but now we are 99% sure everything is right and there is at least .080 of PTV on the intake side.
We are supposed to start the car tomorrow and hopefully dyno on Friday and then drag race on Saturday. Keeping my fingers crossed.
There are a few reasons it took so many attempts to get the cam installed right but the main one is the darn timing chain a la Aussie style.
The instructions showed how to install a 24 tooth or a 20 tooth but this one had 22 teeth. At 0 the cam was installed at 106. Well we wanted 109. -2 still resulted in 106, -4 still resulted in 106. Then -6 it jumped to like 114. I know enough about high performance to make smart purchases but I have never had to degree a cam in my life so I don't even know if I just said all of that right. The only two cams I have ever installed called for dot to dot so I didn't have to worry about all of this. Next we tried +2, +4 +6 and finally +8 which resulted in the 109 the cam called for. I'm sure I said some of this wrong and I'm sure some of the numbers are wrong but long story short, the timing chain caused a ton of trouble but now we are 99% sure everything is right and there is at least .080 of PTV on the intake side.
We are supposed to start the car tomorrow and hopefully dyno on Friday and then drag race on Saturday. Keeping my fingers crossed.
Well now the f'n pushrods are too long. I hope shimming the rocker stand tomorrow is the fix. If not, I'm going to miss the drag racing event this weekend that I have been busting ***** to make.
On The Tree
Joined: Sep 2004
Posts: 188
Likes: 1
From: Houston, TX
If the pushrods are too long then buy new ones! Don't mess up the rocker geometry by shimming rockers that are in the right place. This is one of the MOST COMMON mistakes LS1 guys make. The ET heads have the mounting flange for the rockers already at the correct height for stock rockers with no shims installed.
correct pushrods
Originally Posted by PewterZ28
Well now the f'n pushrods are too long. I hope shimming the rocker stand tomorrow is the fix. If not, I'm going to miss the drag racing event this weekend that I have been busting ***** to make.
Do not shim the stands. bad things come to those that do!!
We got the right size pushrods. Install was completed. Go here for results:
https://ls1tech.com/forums/showthrea...42#post6620042
https://ls1tech.com/forums/showthrea...42#post6620042
ETP recommend going with the 215cc heads for my setup. They are setup at 59cc with a .040 cometic gasket. I think that should be around 11.5 to 1.(I could be wrong) Jim at speed spec'd the cam. I'll let him post the specs if he wants to. Should make some good power. We are hoping for about 450 rwhp thru the 4l60e and 9 inch. I'm having Speed Inc. port my ls6 intake to the heads. Thanks ETP and Speed for helping me setup the combo. I hope to have results in about a month.
