NastyZ28 Forum



Go Back   NastyZ28.com > Drivetrain & Performance > High Performance Modifications
User Name
Password

Reply
 
Thread Tools Display Modes
Old 08-23-2011, 10:44:03 AM   #1
flak monkey
Lifetime Gold Member
 
flak monkey's Avatar
 
Join Date: Aug 2011
Location: Norfolk, UK
Posts: 802
Edelbrock E-street heads or not?

I need some heads for my 350 build and I am wondering what opinion you guys have of the E-street heads from Edelbrock?

The basic spec of the engine will be:
350 bored .030 over
Stock cast crank
Scat or Eagle Rods
TRW high comp (10.2:1 with 70cc heads) forged pistons
Lunati Voodoo 268/276 cam

So I need some heads to match up with it...

I have been recommended the E-street heads, but have concerns that people have reported valve spring breakages over 5500 rpm. And I plan on taking the engine to around 6500rpm.

Of course I could change the springs, but then dont know whats available to fit in the 1.25" OD seats of the Edelbrock head. Then its into more expense of matching up with retainers etc etc.

Bear in mind that although the E Street heads cost you guys $900 or so in the US. For me to buy a set from my local parts guy I am looking at the equivalent of $1,386 and it doesnt work out much cheaper for me to get them shipped from the USA either by the time you add shipping, tax and duty.

So what would you recommend?
flak monkey is offline   Reply With Quote
Old 08-23-2011, 11:08:57 AM   #2
vegafish33
Veteran Member
 
Join Date: Jul 2008
Location: Montreal
Posts: 265
i have no experience with these heads, but i am also in the market. not to hi jack, but can some one post experiences/opinions/recommendations on edelbrock's other cylinder head options as answer OP questions.
vegafish33 is offline   Reply With Quote
Old 08-23-2011, 11:15:05 AM   #3
flowjoe
Lifetime Gold Member
 
Join Date: Feb 2006
Location: SoCal
Posts: 7,257
Quote:
Originally Posted by flak monkey
I need some heads for my 350 build and I am wondering what opinion you guys have of the E-street heads from Edelbrock?

The basic spec of the engine will be:
350 bored .030 over
Stock cast crank
Scat or Eagle Rods
TRW high comp (10.2:1 with 70cc heads) forged pistons
Lunati Voodoo 268/276 cam

So I need some heads to match up with it...

I have been recommended the E-street heads, but have concerns that people have reported valve spring breakages over 5500 rpm. And I plan on taking the engine to around 6500rpm.

Of course I could change the springs, but then dont know whats available to fit in the 1.25" OD seats of the Edelbrock head. Then its into more expense of matching up with retainers etc etc.

Bear in mind that although the E Street heads cost you guys $900 or so in the US. For me to buy a set from my local parts guy I am looking at the equivalent of $1,386 and it doesnt work out much cheaper for me to get them shipped from the USA either by the time you add shipping, tax and duty.

So what would you recommend?
In that price range what are your other options? None I would guess.
I bought a set for my 350 that is slated to go into the '71 RS/SS. The motor is assmebled and ran fine on the test stand but I have yet to run them on the street. I know it's not much feedback but it's something. FWIW, for the price you get an awful lot even if they are not exactly perfect for your particular application - you get a good base that needs little mod to work for you. On the down side, they are pretty much an old school design.
__________________
Camaros
'67 LA V8 Convertible, Butternut Yellow
'69 NOR Z/28, Yellow w/black stripes - X-77
'69 LA SS 350, Fathom Green
'69 LA Z/28, Daytona Yellow
'70 LA Z/28, Daytona Yellow
'71 LA RS/SS, Nevada Silver
'71 LA SC, Green
Pontiacs
'67 Firebird convertible
'69 GTO - Triple black, 50,000 miles
Corvettes
'70 LT-1, T-top, 4spd, Bridgehampton Blue
'82 T-top, white
flowjoe is online now   Reply With Quote
Old 08-23-2011, 01:17:15 PM   #4
Kamikaze
Lifetime Gold Member
 
Kamikaze's Avatar
 
Join Date: Aug 2005
Location: So. Lake Tahoe CA. USA
Posts: 5,012
being that you are out of the USA, and I am assuming you have limited availability to American Performance products in your country, I would assume that you would have to order almost anything to be shipped to you.

With that being said, I would have you consider spending a little more money and look at a Vortec head and intake conversion. That would be more of a match for the cam spec you posted and could have a more efficient as well as more responsive street engine combination.
__________________
Vehicles were made to be driven! Classic is cool but stock is boring!
Kamikaze is offline   Reply With Quote
Messages from Our Sponsors !
Awesome NastyZ28.com Merchandise !!

T-shirts, wearing apparel

Drinkware, Mouse Pads, Decals

Old 08-23-2011, 01:40:00 PM   #5
flak monkey
Lifetime Gold Member
 
flak monkey's Avatar
 
Join Date: Aug 2011
Location: Norfolk, UK
Posts: 802
Thanks for the feedback, the Vortec heads are very scarce over here and from what I understand were only available with a 64cc chamber which takes my compression well above pump gas territory (just over 11:1). Unless I can find an already modified set then its a non-starter I think as it would cost me nearly as much to have them modified over here as it would to buy new heads.

I can get almost all performance parts from a local american specialist, they just cost at least 30-40% more than if I were based in the US.
flak monkey is offline   Reply With Quote
Old 08-23-2011, 02:04:19 PM   #6
Kamikaze
Lifetime Gold Member
 
Kamikaze's Avatar
 
Join Date: Aug 2005
Location: So. Lake Tahoe CA. USA
Posts: 5,012
I was assuming you were still in the process of building up your short block and could adjust your piston selection to work with 64 cc heads.

If you are already set with the pistons you have, you may want to consider the standard Edelbrock RPM heads in 70 cc's.

There are cheaper cast iron performance heads that would do well but the savings cost in initial purchase price will probably be made up in shipping costs to you.
__________________
Vehicles were made to be driven! Classic is cool but stock is boring!
Kamikaze is offline   Reply With Quote
Old 08-23-2011, 02:10:48 PM   #7
flak monkey
Lifetime Gold Member
 
flak monkey's Avatar
 
Join Date: Aug 2011
Location: Norfolk, UK
Posts: 802
Ah no sorry, I already have all the short block components, and bought it as a heap of parts. I would ideally like to find some heads to work with the existing combo rather than have to change pistons.

The RPM heads look ok, I guess my question really was has anyone modified the E-street heads to cope with higher revs? If so what did you use?
flak monkey is offline   Reply With Quote
Old 08-23-2011, 02:29:11 PM   #8
Kamikaze
Lifetime Gold Member
 
Kamikaze's Avatar
 
Join Date: Aug 2005
Location: So. Lake Tahoe CA. USA
Posts: 5,012
The E-street heads are not as friendly to modifications as the RPM heads. They are more for the low compression, bolt on market and the seat areas under the springs don't allow for too much more pressure, IMO.

we've used them on a couple of mild to mid performance applications and they work well for the persons that want to pull them out of the box, wipe them down and bolt them on and go...

I believe you will be spending less on the RPM Performer heads and having less issues in the long run
__________________
Vehicles were made to be driven! Classic is cool but stock is boring!
Kamikaze is offline   Reply With Quote
Old 08-23-2011, 02:31:12 PM   #9
flak monkey
Lifetime Gold Member
 
flak monkey's Avatar
 
Join Date: Aug 2011
Location: Norfolk, UK
Posts: 802
Thanks

Looks like I better start saving up and then just stick and order in with Summit later in the year!
flak monkey is offline   Reply With Quote
Old 08-23-2011, 02:44:49 PM   #10
Notalent
Veteran Member
 
Join Date: Jan 2010
Location: Dallas/LBC
Posts: 387
The Estreets are a great budget head. We have used them on up to 430HP 383 strokers and have not had a problem. Its virtually the same head as the RPM line minus different valve seals, springs and valves.

With your combination, and a .500 ish lift cam...I dont see you taking this engine up to 6500RPM....probably wont make much power past about 5600rpm...shift around 6k.
__________________
1971 Chevelle - 496CI, TH400, 3.73 gears, 3500 Stall

ATK HIGH PERFORMANCE ENGINES
WWW.HIGH-PERFORMANCE-ENGINES.COM

Custom Built Street/Strip or Racing Engines!

ATK HP Engines Facebook Fan Page:
http://www.facebook.com/pages/ATK-Hi...49964895082371
Notalent is online now   Reply With Quote
Old 08-23-2011, 08:16:18 PM   #11
markw
Veteran Member
 
Join Date: Jun 2009
Location: Illinois
Posts: 793
Check out page 2 of this build....http://www.carcraft.com/techarticles...der_heads.html
markw is offline   Reply With Quote
Old 08-24-2011, 02:56:47 AM   #12
flak monkey
Lifetime Gold Member
 
flak monkey's Avatar
 
Join Date: Aug 2011
Location: Norfolk, UK
Posts: 802
Good to know thanks at the moment I am coming back around to the E-streets if they can be machined to take better valve springs all the better.

Plus I can do the hand blending of ports and chambers and save myself a few $$.
flak monkey is offline   Reply With Quote
Old 08-24-2011, 08:22:48 AM   #13
Camarocore
Lifetime Gold Member
 
Camarocore's Avatar
 
Join Date: Feb 2006
Location: Israel
Posts: 555
they are great bang for the buck
Camarocore is offline   Reply With Quote
Old 08-24-2011, 08:54:12 AM   #14
flak monkey
Lifetime Gold Member
 
flak monkey's Avatar
 
Join Date: Aug 2011
Location: Norfolk, UK
Posts: 802
It looks like Comp Cams beehive springs (26981-16) might fit straight in without any machining and different retainers as they are the same OD.

The only difference is they are quoted for a 1.7" installed height rather than the 1.75" in the E-street heads. Wouldnt have thought .050 will make much difference though. Coil bind height is 1.115" so I could fit a .050 shim and still have enough room for 0.5" lift quite easily.
flak monkey is offline   Reply With Quote
Old 08-24-2011, 07:18:43 PM   #15
mjoc
Veteran Member
 
Join Date: Apr 2003
Location: Sherman Oaks, Ca
Posts: 3,161
Save up and get yourself a set of AFR 195s.

Michael
__________________
1962 Corvair panel van, 1967 Buick GS400 Convertible, 1970 RS/SS Camaro, 2000 Mercury Gran Marquis, 2009 F450 crew cab Lariet 4x4, 1954 Triton Motorcyle( original cafe racer.) 1967 triumph Bonneville chopper.
mjoc is offline   Reply With Quote
Reply




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



Copyright © 1997 - 2014 NastyZ28.com Inc.
Powered by vBulletin Version 3.5.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.