FSB Forums - Reply to Topic
Thread: Svo or procomp heads? Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the FSB Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself. DO NOT USE Gmail.com accounts. If you only have a Gmail.com email please contact the administrator here

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
12-31-2012 12:07 AM
toysforme1 Sorry I missed the 408 part of the build.... But the E-street (190) out flow the pro-comp so if the Pro's are good enough, then the Street's should be also. Don't let any one number (valve size, runner CC, port size ect) make you think one head is better than the other, its the end result (average flow under .500 lift). And depending what cam and RPM range you plan to run, any one of these heads might not be ideal. That being said I think most say that bought the Pro-Comp heads have to go back through and re-machine valve train to get everything equal and in spec. Then CNC porting to get ideal flow numbers.... at that point the cost is up there with AFR's. The E-Street heads have there down fall with valve train also. There is a "kit" out there to change valves, springs and keepers that will alow you to run a rollor cam with over .500 lift. But again at that point you are at the cost of the Elderbrock Preformer.

One thing to look at if you plan to run the same heads on two different builds... compression ratio. Just check what CC chamber size you will need for the 408.
12-30-2012 08:37 PM
JBfab Edelbrock also states that you cant run the 2.02 valve with stock pistons but you have to use the 1.90 valve. So right off the bat edelbrock requires me to bottle neck it.
12-30-2012 08:31 PM
CrazyBRONCOguy have read that the e-street do not like roller cams and you have to be careful what you run with them. Its why I sent my set back and got AFR's for my 351W.
http://forums.corral.net/forums/5-0-...eet-heads.html just one example
12-30-2012 08:25 PM
cobra2411 Car Craft just tested a bunch of heads on a 302. The e-streets were among them and did pretty good for the price, they came in 2nd in HP and tied for 3rd in TQ and all for $935.

Motor was Ford's Boss 302 with the B303 cam. The e-streets came in at 371hp@6,200 & 346tq@4,400.

They've got 2.02/1.60 valves, 170cc intakes and 60cc chambers and come with a 1.250 single spring good for .550 lift. CC suggested adding a 30* back cut to the valves to help out a little weakness in the midrange but said they looked like the best bang for the buck.

And they're made in the USA.

They also tested the FRPP X307 heads which were very close in performance and priced at $1,119.90. The ford heads use the fulcrum based rockers, so if you already have a set for your heads you can factor that into the total cost.
12-30-2012 08:19 PM
Originally Posted by toysforme1 View Post
Elderbrock E-Street heads. That with Preformer cam is clamied to make 321 Hp. Thats under 5500 rpm. Heads are a little over $900
But as stated earlier they dont support over 400 Hp. My guess is the 408 will be making more then that but not with those heads.
12-30-2012 07:59 PM
toysforme1 Elderbrock E-Street heads. That with Preformer cam is clamied to make 321 Hp. Thats under 5500 rpm. Heads are a little over $900
12-30-2012 03:23 PM
TS 90F150
Originally Posted by JBfab View Post
Just looked and the guy selling them has no feedback and only 35 posts. While looking around there found a set of windsor sr. lite heads for $900.
Didn't pay attention to that, I just happened to cruise the classifieds for a few minutes.

There is one tech thread where the guy upgraded to AFRs, he may be selling his heads too. Another guy posted in same thread about upgrading his and he may be gonna sale his.

There are deals out there, especially in this economy. But you are correct, you don't want to get taken or buy some heads that neeed lots of work.

12-30-2012 03:14 PM
JBfab Just looked and the guy selling them has no feedback and only 35 posts. While looking around there found a set of windsor sr. lite heads for $900.
12-30-2012 02:42 PM
TS 90F150 I agree if you are going larger (408) I would buy AFR or TW heads. But the X heads are good heads too. I found my two sets on the corral.net classifieds. There is a set of X heads on there right now for $650.00.

12-30-2012 11:20 AM
BigWheelz Procomp heads are risky in my opinion. Too many issues floating around the internet for me to be interested. Let just say they come from "the land of not quite right".

The GT40X heads require a unique intake gasket due to large, raised port...but otherwise are a perfect fit. At $1K for a pair they are the best deal going for aluminum heads.

The Trick Flow heads work well....but they require new pushrods and rockers, along with a conversion to an adjustable valvetrain. Add $500 to the cost for these parts. Piston to valve interference can be an issue with large cams too, but these cams are not well suited for a bronco.

Edelbrock Performer 5.0 and AFR 165 both come in pedestal mount....but are $$$$

GT40 iron heads can be had in the bone yard on 1996 and early 1997 explorers. I recently picked up a pair of these for $75 at a pick-n-pull. Add $300 for a valve job and these are by far the cheapest option.
12-30-2012 09:29 AM
Originally Posted by BRONCONUT View Post
What is wrong with Eddlebrock performer's?
Well the price is up there @ about $1,300 a set. And from what I have read they only support about 400hp in stock form. With the 408 thats going in im hoping for alittle more then that and not have the heads needing extra work.
12-30-2012 03:07 AM
88bronc91stang It's a great price, but do NOT get the Trick Flow high ports! That is a race only head and requires special headers. I doubt that anyone even makes a header for those heads in a truck application. By reputation, Brodix heads are good but I've never known anyone that used them. we've always had good results with Trick Flow, AFR, Edelbrock and Canfield.
12-30-2012 12:46 AM
BRONCONUT What is wrong with Eddlebrock performer's?
12-30-2012 12:36 AM
JBfab He didnt list a price. I called him and he hasn't called back. I also spotted a set of trickflow assembled high port heads new for around $1,100. Which is better the high ports or twisted. Also found some brodix bare heads for about the same cost. Im kind of shy about buying used heads because i dont want to have to put money into them. Who knows what the po did or knew. Could have warped the head cracked the head etc. etc. now that everyone sugests staying away from procomps ive opened up my search and my budget.
12-29-2012 11:51 PM
88bronc91stang Twisted Wedges have 2.02 intake and 1.60 exhaust valves. With a stock .444 lift cam, they fit the Mustang 5.0 with no valve-to-piston interference but I'm not sure if the truck pistons have valve reliefs like the factory HO TRW pistons do. One reason the Trick flows have the canted valve design is to allow clearance on stock pistons. I would think that the canted valves and relatively low lift of the factory cam would allow you to run the Wedges with no problems. Just to be safe though, check the clearance with modeling clay if you do buy them.

Just out of curiosity, what is the asking price on that set of heads? If they are anywhere under $1000, it's a bargain.
12-29-2012 05:20 PM
JBfab I spotted a set of twisted wedge heads on my local craigs list. Would those require differant pistons to run. Im uncertain of there valve size at the moment.
12-29-2012 04:29 PM
88bronc91stang Just my opinion...but if you are eventually upgrading to a 408W, i wouldn't purchase either set. Instead, look for a set of Trick Flow, AFR or Canfield heads. If price is a concern, add Edelbrock Performer heads to the list. I have Trick Flow's on my car and they are excellent quality and great performance heads.

As for the quality questions about the Pro-Comps....the one set I have seen were junk. They were on a SBC and it took almost .030" of milling to get the deck surfaces flat enough to seal against the block.
12-29-2012 03:55 PM
cobra2411 There are at times great bargains to be had and at other times... Well you get what you pay for. I find it hard to believe that they can under cut a long time manufacturer by 1/3 and still offer a quality product.

I've been looking for heads and $600 sounds a lot better than $1,000 but not if I need $400 in parts and labor to make them work. If I worked at a machine shop and could work on my own stuff after hours I'd get them in a heart beat.

Right now I'm casually looking for a used set, probably an SVO (FRPP) set.
12-29-2012 02:22 PM
Caddylackn If you do a search on pro-comp head reviews on other forums you'll see nothing but either mediocre or bad reviews. Machining and clearances assembled are all over the place. Once they are re-machined they are okay.

The new castings might be better, but the problem with the old castings was mostly quality control.

Figure either head you choose you'll be taking them to the machine shop. I'd do the SVO heads, at least they will have resale value if you don't like them.
12-29-2012 10:44 AM
Originally Posted by BigWheelz View Post
Are the Pro-Comps Chinese castings?
All i know is its a newer casting. Ive heard they had problems with the old castings and redid them. Im sure they are from overseas, let me look into that. Yup china
This thread has more than 20 replies. Click here to review the whole thread.

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

For the best viewing experience please update your browser to Google Chrome