• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

How much psi after stroking my engine?

  • Thread starter Thread starter -86GTStang
  • Start date Start date Sep 5, 2010

-86GTStang

Member
Dec 27, 2003
165
0
16
Norway, Scandinavia
Sep 5, 2010
#1
  • Sep 5, 2010
  • #1
Hi. Bought a T&L built engine, .040 bore 302cid last summer.
After a while, I discovered a crack in the block near the oilfilter.
Rebuildt everything into a 1968 302cid, mustangblock, bored .040 over.
Hopefully, little thicker and stronger block?
After use my engine as a NA this summer, I like to install my P1SC.
My old 302cid setup, made 10,7 psi at 6100rpm/ 520fwhp
How will my stroker engine, 349cid, act compared to my stock one,same pulleys.
Someone told me, approx 8,5psi, because of more cubic inches?

Thanks.
 

Rick 91GT

Mustang Master
Nov 29, 1999
9,692
95
99
PA
Sep 6, 2010
#2
  • Sep 6, 2010
  • #2
You'll loose a little boost with the increased cubes, but not much... I'd be more concerned about your compression ratio, most flat top 347 combos are over 10:1.
What compression is the new motor? Cam profile has a lot to do with boost as well, there are many variables.
 

Michael Yount

Mustang Master
Apr 10, 2002
9,039
6
79
Charlotte, NC
Sep 6, 2010
#3
  • Sep 6, 2010
  • #3
Eventually, I'd be concerned about more cracks in the block.
 

-86GTStang

Member
Dec 27, 2003
165
0
16
Norway, Scandinavia
Sep 7, 2010
#4
  • Sep 7, 2010
  • #4
Thanks for your input.

Comp ratio is 10:1. I will not run more than 8psi. Dont know so much about the cam, Its custom made for mild boost or nitros, and installed by T&L engines. Could not find any partnumber or brands markt on it.
The guy I bought it from, orded it for mild boost.
Its so gentle and kind, sounds like the stock camshaft , compared to my old trick flow -2000 cam. It shold be aroud .540 ex and int.
Rotating assembly is Eagle forged crank, H-beam rods, Male pistons, ARP all engine, included main journals. Commetic mls gaskets, Dart pro1 heads.
Trick flow track heat lower, upper. C&L 80mm and 42# injectors.
And, yes , not the strongest block in the class. Hope a good tune, and 99-100 octane fuel will make it last for some days.

Did run 12,1 sec / 116,5Mph, 1,665 60ft last weekend, raceweight 3550lbs


Clip from our Norwegian Mustang club Bracket racing event,red -86GT :
YouTube - Mustang Speed Week 2010, finale bracket og badboys.
 

Attachments

  • Resize of img_3649.webp
    58.1 KB · Views: 185

madspeed

Colonel Mustard
Founding Member
Nov 29, 1999
8,914
1,332
204
a van down by the river
Sep 8, 2010
#5
  • Sep 8, 2010
  • #5
Hey man, you've got a NICE CRACK!
 
You must log in or register to reply here.

Similar threads

6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
965
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
SN95 Desktop 363 Engine Combination - Looking for input
  • WhiteCobra95
  • Sep 8, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
11
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Oct 6, 2025
Habu135
E
Finished my Fox Hydroboost Install - Tips
  • Engineer Duane
  • Apr 9, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
4
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- May 5, 2025
Engineer Duane
E
B
How much power can a 94 GT make if you don't change the look of the engine?
  • bennylava
  • Aug 13, 2022
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 3 4 5
Replies
82
Views
12K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Aug 31, 2022
revhead347
J
89 2.3 LX running rich, hesitation on acceleration, high and hanging idle Help!
  • jpstucky
  • Jun 13, 2023
  • 2.3L (N/A & Turbo) Tech
Replies
4
Views
3K
2.3L (N/A & Turbo) Tech Jun 15, 2023
jpstucky
J
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 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?