• Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Stock 2V Pistons - Will they hold up?

  • Thread starter Thread starter 53BigDog
  • Start date Start date Mar 15, 2008

53BigDog

Active Member
May 22, 2001
2,331
0
47
Palm Harbor, FL
Mar 15, 2008
#1
  • Mar 15, 2008
  • #1
I have a 97 GT with Ported and Polished Multi-angle Valve Job PI Heads and Cushman Motorsport (Jim's) Stage 2.5 Cams & Springs

During this rebuild I am looking at staying N/A and raising my CR to about 10.5:1. I am sticking with the Steel Crank, have read I should upgrade the stock rods/beams to H Beams.

Now looking at the pistons. The Stock is a 15cc in a 49.77cc chamber and I would love to upgrade to an 9cc-11cc but wanted to know if my 15cc pistons would first yeild the higher compression and second stand up to the higher compression? Not knowing the condition of the block yet I will probably bore a bit to clean it up. 110K on the block.
 

Superhereaux

chicks make me feel inadequate
Founding Member
Jul 30, 2002
538
3
59
South Texas
Mar 15, 2008
#2
  • Mar 15, 2008
  • #2
with a slightly higher compression ratio you're really not putting too much additional stress on the pistons so i think you'll be ok

putting PI heads on an older mustang will yeild a higher comp ratio, but by how much i couldn't say
 

CobraRed_96_GT

Active Member
May 20, 2006
1,421
4
39
UCSD/La Jolla
Mar 15, 2008
#3
  • Mar 15, 2008
  • #3
Superhereaux said:
with a slightly higher compression ratio you're really not putting too much additional stress on the pistons so i think you'll be ok

putting PI heads on an older mustang will yeild a higher comp ratio, but by how much i couldn't say
Click to expand...

about 10.5:1 compression, maybe 10.4 if it's got some miles on it. But his heads are ported, which denotes less compression due to machining.
 
G

Greenbird

New Member
Dec 19, 2004
34
0
0
Mar 15, 2008
#4
  • Mar 15, 2008
  • #4
Stock pistons are 10.5cc dish, and the heads will be 46cc or less. Your already going to have 10.5:1 CR. I would use the stock short block up to ~6200 rpm, and when you want more, then build a forged short block for a power adder.
 
You must log in or register to reply here.

Similar threads

Engine Suggestions on an engine rebuild. Stock cam/GT40Ps or aftermarket on both for a fun weekend driver?
  • MadSquirrelTech
  • Apr 28, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
23
Views
812
Fox 5.0 Mustang Tech May 7, 2026
MadSquirrelTech
Engine Raising compression on a relatively stock 302
  • keel
  • Jul 9, 2023
  • Fox 5.0 Mustang Tech
Replies
16
Views
8K
Fox 5.0 Mustang Tech Jul 20, 2023
keel
Holding valves up
  • Creomod
  • Jun 5, 2023
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
7
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jul 16, 2023
Creomod
For Sale 94 Cobra 408w AOD Project For Sale
  • Labora
  • Oct 11, 2024
  • SN95 Mustangs For Sale (1994-04)
Replies
1
Views
1K
SN95 Mustangs For Sale (1994-04) Apr 7, 2025
Labora
Specific Cam Questions that Google can't seem to answer...
  • ChillPhatCat
  • Jun 20, 2024
  • 2.3L (N/A & Turbo) Tech
Replies
3
Views
796
2.3L (N/A & Turbo) Tech Jun 22, 2024
ChillPhatCat
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?