Open/Closed heads - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 04-30-2004, 20:08   #1 (permalink)
Krazy Kyle
 
Bounty's Avatar
 
Join Date: Jun 2003
Location: In The Mount
Age: 29
Posts: 97
Open/Closed heads

Got a couple of questions.

1. How do u know if u have open or closed heads?
2. are the exhaust bolts the same
3. how do the 302 and 351 heads differ?
__________________
XF Ute. 351. LSD 9" 4wdics. Manual. Lowered. Tinted. All Elec. 16" mags. Huge "doof doof".
Bounty is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-30-2004, 21:28   #2 (permalink)
74 XB Fairmont
 
brenx's Avatar
 
Join Date: Sep 2001
Location: Cranbourne, Vic
Posts: 5,113
Re: Open/Closed heads

Quote:
Originally Posted by Bounty
Got a couple of questions.

1. How do u know if u have open or closed heads?
If the heads are off the engine? The open chamber heads have a circular combustion chamber. The closed chambers have a flat section oposite the spark plug hole.

Quote:
2. are the exhaust bolts the same
Yes. 302 and 351 are the same if 2V. 2V and 4V are different. 4V has very very large ports. They are obvious. Most engines are 2V though.

Quote:
3. how do the 302 and 351 heads differ?
Just the combustion chamber and the 2V-->4V differences.

Brenden
__________________
XB Fairmont (street car) 11.07@123.02mph.

Last edited by brenx; 05-01-2004 at 18:00. Reason: Errors and omissions for Clevo400 ;)
brenx is offline   Reply With Quote
Old 05-01-2004, 12:32   #3 (permalink)
Registered User
 
Join Date: Jun 2003
Location: Townsville
Age: 41
Posts: 1,212
Re: Open/Closed heads

I agree with Brenden !!!
__________________
regards
Stephen

Last edited by clevo400; 05-02-2004 at 05:57. Reason: Spelling mistake picked up by xdclevo
clevo400 is offline   Reply With Quote
Old 05-01-2004, 19:49   #4 (permalink)
Registered User
 
xdclevo's Avatar
 
Join Date: Mar 2004
Location: Cairns
Posts: 1,946
Re: Open/Closed heads

clevo400, while where at it, who is Brendan.
__________________
10.70 @ 125.00 on the black fun top
408 Cube Cleveland.
xdclevo is offline   Reply With Quote
Old 05-02-2004, 01:31   #5 (permalink)
Registered User
 
Join Date: Apr 2003
Location: Perth Hills WA
Posts: 540
Re: Open/Closed heads

Quote:
Originally Posted by brenx



Yes. 302 and 351 are the same if 2V. 2V and 4V are different. 4V has very very large ports. They are obvious. Most engines are 2V though.




Brenden
Not wanting to be pedantic but the term 4V and 2V appears to be some what mis-used. When you say that most engines are 2V, don't you actually mean 4V with small port heads? In other words, the term 4V and 2V stands for 4 venturi and 2 venturi.

As with all XC/D/E V8 cars, they were all 4V cars with small port heads. All of the XW/Y/A and early XB GT's had tyhe 4V motors but with the big port heads. Yes??
paull is offline   Reply With Quote
Old 05-02-2004, 01:41   #6 (permalink)
socially irresponsible
 
JG33PY's Avatar
 
Join Date: Jun 2002
Location: moranbah
Posts: 1,194
Re: Open/Closed heads

Quote:
Originally Posted by paull
Not wanting to be pedantic but the term 4V and 2V appears to be some what mis-used. When you say that most engines are 2V, don't you actually mean 4V with small port heads? In other words, the term 4V and 2V stands for 4 venturi and 2 venturi.

As with all XC/D/E V8 cars, they were all 4V cars with small port heads. All of the XW/Y/A and early XB GT's had tyhe 4V motors but with the big port heads. Yes??

i'd suggest it's quite well known that large port heads are said to be 4v and small port are 2v regardless of ventury (in australia of course) the yanks never had 2v closed chamber heads. this is a good thing because we have so many for ourselves
i believe with a little bit of porting our 2v closed chamber heads are the best for "street" engines
JG33PY is offline   Reply With Quote
Old 05-02-2004, 05:54   #7 (permalink)
Registered User
 
Join Date: Jun 2003
Location: Townsville
Age: 41
Posts: 1,212
Tongue Re: Open/Closed heads

Quote:
Originally Posted by xdclevo
clevo400, while where at it, who is Brendan.
Is Brenx = Brenden ???
Under this line this name was written
"Just the combustion chamber and the 2V-->4V differences"
Brenden

Oh, xdclevo u got me. I should stop doin this at 2am and get some sleep !!!
I will also modify my thread and will start reading the dictionary.
__________________
regards
Stephen
clevo400 is offline   Reply With Quote
Old 05-04-2004, 07:18   #8 (permalink)
Registered User
 
xdclevo's Avatar
 
Join Date: Mar 2004
Location: Cairns
Posts: 1,946
Re: Open/Closed heads

Just kididing around clevo400. But back to the 2v and 4v. I think if we left it as most people understand, 2v and 4v are small/big ports, 2 barrel and 4 barrrel are the number of venturies. Savy.
__________________
10.70 @ 125.00 on the black fun top
408 Cube Cleveland.
xdclevo is offline   Reply With Quote
Old 05-05-2004, 04:11   #9 (permalink)
Registered User
 
Join Date: Dec 2002
Location: Sydney
Posts: 1,927
Re: Open/Closed heads

On late model (XC-on) Clevos, CLosed chambers were used on 302s to give a compression ratio of 9.2:1 and open chamber (referred to as pollution heads in the USA) were used on 351s to give a comp. ratio of 8.9:1. Bolt 302 heads onto a 351 to give 11:1 comp. You will need LPG or high octane petrol to get them to run unless you open out the cambers a bit. All late model aussie heads were (2V small port). All ran Carter Thermoquad 4Venturi caburettors.
__________________
1978 XC Fairmont GXL, Emerald green, Jade Int. 351C, 750 VAC, C10, 9" LSD
Air, steer, power windows................
xcgxl is offline   Reply With Quote
Old 05-07-2004, 01:53   #10 (permalink)
Registered User
 
xdclevo's Avatar
 
Join Date: Mar 2004
Location: Cairns
Posts: 1,946
Re: Open/Closed heads

Running a 351, with 58cc closed chamber heads, and the standard deck height of cleveland block of approx 30 thou, you would have about 10.3:1. As long as the deck has not been machined down, you be able to run pump fuel fine. I have many mates with closed chamber heads on 351's using pump fuel, and they dont ping. The other cosideration is the cam. If you run a very small or standard cam, the dynamic compression will be higher and may casue a bit of pinging. If you are running a decent cam with perfrmance in mind, it would be ok. Again, why would one want run high compression, with a standard cam if they didnt have performance in mind.
__________________
10.70 @ 125.00 on the black fun top
408 Cube Cleveland.
xdclevo is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > Cleveland Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Heads on the ol' Windsor SVO Pete Windsor Tech 4 04-29-2004 07:18
Any alloy heads floating around? XF460 429-460 Tech 2 04-20-2004 21:09
Which heads on my 302 engine? Archimedes Ford Mustang Forum 1 08-02-2003 20:15
What width rockers for Edelbrock heads EDxr8EBgt Windsor Tech 11 06-23-2002 17:51
Arao 32 valve heads going *cheap* on ebay anakha The Pub 0 10-22-2001 22:08

Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 16:22.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.