GT40 heads and push rods>? -

Go Back > Ford Mustang Tech > 5.0L (1979-1995) Mustang

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

GT40 heads and push rods>?

Thread Tools Search this Thread
Old 01-31-2008, 08:04 AM   #1
Join Date: Jan 2008
Posts: 17
Send a message via AIM to newton5.0
Default GT40 heads and push rods>?

hey i am rebuilding a 91 LX and i am putting some GT40 cast heads on it that i am buying from a buddy. Any idea what i will be needing for push rods and rockers?The car already had a big cam in it when i bought it but i am not sure on the size.
newton5.0 is offline   Reply With Quote
Old 01-31-2008, 08:26 AM   #2
The Godfather
jthorn9's Avatar
Join Date: Sep 2005
Vehicle: 2013 Mustang GT CS
Location: College Station, Texas
Posts: 15,476
Jeremy Thorner jthorn9
Default RE: GT40 heads and push rods>?

Well the rocker lift will be 100% up to you. A dyno posted showed that 1.7s do add power over 1.6s, however it wass marginally so, a few people have also complained of having too rough of an idel with 1.7s, others have had no issues, so again, this one is up to you. Stock rods should do, but if you feel the need, hardened will do just fine as well.
16 Mustang GT - 390 RWHP 370 TQ
13 Mustang V6 PP - 270 RWHP 260 TQ

95 Mustang SVO - 400 RWHP 400 TQ sold
13 Mustang GT CS - 380 RWHP 370 TQ
08 Mustang GT - 285 RWHP 305 TQ sold
99 Mustang Cobra - 280 RWHP 290 TQ sold
11 Mustang V6 - 270 RWHP 260 TQ sold
97 Mustang GT - 190 RWHP 250 TQ sold
00 Mustang V6 - 145 RWHP 184 TQ sold
98 Mustang V6 - 125 RWHP 210 TQ sold
jthorn9 is offline   Reply With Quote
Old 01-31-2008, 07:14 PM   #3
2nd Gear Member
Join Date: Jun 2007
Location: Roseville, CA
Posts: 444
Default RE: GT40 heads and push rods>?

stock lenght is good, but keep in mind-what ever amount you have the heads milled, have the shop take the same amount off the top of the valve stems to keep geometry the same. or you will need shorter pushrods.
tooslow5.0 is offline   Reply With Quote
Old 01-31-2008, 08:23 PM   #4
5th Gear Member
Joel5.0's Avatar
Join Date: Jan 2006
Vehicle: 1986 Ford Mustang GT
Location: Puerto Rico
Posts: 3,926
Default RE: GT40 heads and push rods>?

You need to check the valve train geometry with an adjustable pushrod to check what's the correct PR length(s) you need to order..... camshaft, heads, rockers, valves...... all affect the PR length requirement.
LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That, YCYDYP=Your Car Your Dough Your Prerogative and the classic... DILLIGAS=Do I Look Like I Give A S***

1986 GT-X303-289 heads-1.72 rockers-RG 4+1 Trans.
Originally Posted by Joel5.0
Great thoughts will overwhelm a feeble mind.
There is never money to do it right, but there's always money to do it over.
The proof of understanding is the ability to explain it. (H. Torruella)
Joel5.0 is offline   Reply With Quote
Old 01-31-2008, 08:37 PM   #5
5th Gear Member
Join Date: Dec 2005
Posts: 2,005
Default RE: GT40 heads and push rods>?

Find out the cam specs before you buy rockers, as for pushrods im guessing the heads are pedestal and probably dont have a stud conversion on it, so you can do what i did, get the ford racing stock length hardenedpushrods and shim it, its worked for me and a few others with gt40 iron and aluminums with steeda and e cam.
No Replacement for Positive Displacement.
Mustangkiler is offline   Reply With Quote


Similar Threads
Thread Thread Starter Forum Replies Last Post
351c heads mustangheaven Motor Swap Section 3 01-03-2016 12:20 PM
Terminated Whipple GT battles '13 GT500 on E85 Bokeo Street/Strip 6 10-10-2015 09:28 PM
extnesion for radio antenna to head unit kevsgt 2005-2014 Mustangs 5 10-09-2015 11:12 PM
4 Valve Head questions GimpyHSHS 4.6L (1996-2004 Modular) Mustang 6 10-01-2015 10:01 AM
cost to rebuild heads Drastang 4.6L (1996-2004 Modular) Mustang 2 09-30-2015 04:48 AM

40, 95, flo, forum, gt, gt40, heads, length, mustang, push, pushrods, rod, rods, sale, stock, tech, x303

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -5. The time now is 10:10 PM.

This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company