raising compression ratio - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
LinkBack Thread Tools
post #1 of 7 (permalink) Old 01-17-2004, 01:11 AM Thread Starter
Registered User
 
Join Date: Feb 2003
Posts: 1,211
raising compression ratio

I want to up my compression ratio as much as possible without changing the pistons. 351W Windsor Sr. heads factory dished piston.

1) Can anyone recommend a reliable, but thinner than stock head gasket.

2) How much can you mill the heads before having to mill the intake to match?
slow-poke is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 01-17-2004, 11:04 AM
Registered User
 
Join Date: Apr 2002
Location: Merkel, Tx
Posts: 9,251
raising compression ratio

SCE has a pretty good selection of Ford thin copper gaskets.

http://www.scegaskets.com/catalog.html

1967 Falcon 4 door 351C - 70 Mustang 351C
Owner built, owner abused.
ckelly is offline  
post #3 of 7 (permalink) Old 01-17-2004, 10:27 PM
Registered User
 
Join Date: Jan 2001
Posts: 2,129
raising compression ratio

I think general rule of thumb is that once you get to .030 when milling heads you need to start milling the intake to match.

This horse runs.
Nastystang is offline  
post #4 of 7 (permalink) Old 01-17-2004, 11:25 PM
Registered User
 
Join Date: Mar 2001
Posts: 4,195
raising compression ratio

Any good machinist, (automotive/whatever), will be able to quote you off the top of their head, EXACTLY how much has to come off intake, (bottom and sides), to make them fit after block/head alterations.
If they don't, I"d seriously look into finding another machinist.
My .002
deleted is offline  
post #5 of 7 (permalink) Old 01-18-2004, 09:16 AM
Subscriber
 
Join Date: Jan 2001
Location: Texas
Posts: 2,216
raising compression ratio

I would strongly recommend checking your current valve to piston clearances first. That will tell you how much you can safely move the heads closer to the pistons. Then you can determine head gaskets or head milling limitations.

It doesn't cost that much to have the intake angle milled to match how much you take off your heads. If you can go over .030 on the heads and still keep your valve clearance I say go for it.

Oh, definitely discuss this with your machine shop. At some point on head shaving you wind up having to angle mill them. If you eventually get close enough you will have to have your pistons fly cut and your motor rebalanced. That seems unlikely with dish pistons but its possible.




_________________
1965 289 Mustang 2+2
best 60: 1.70 best 8th: 7.71 @ 89 best qtr: 12.12 @ 110.95

[ This Message was edited by: Hottarod on 1/18/04 8:31pm ]
Hottarod is offline  
post #6 of 7 (permalink) Old 01-18-2004, 10:36 AM
Registered User
 
Join Date: Mar 2001
Posts: 4,195
raising compression ratio

A little FYI. YOu'd be shocked how much metal can come out /off of a piston, (i.e. fly cutting valve reliefs), before you have to rebalance. (been there, done that........lots).
deleted is offline  
post #7 of 7 (permalink) Old 01-18-2004, 12:49 PM Thread Starter
Registered User
 
Join Date: Feb 2003
Posts: 1,211
raising compression ratio

Thanks for the input, I measured piston to deck clearance today, its zero so thinner gaskets are out. looks like new pistons or smaller chamber heads.
slow-poke is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



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

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

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

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