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

306 H/C/I with spray, am I gonna kill my block?

  • Thread starter Thread starter KingofBattle119
  • Start date Start date Apr 2, 2011

KingofBattle119

New Member
Dec 21, 2008
17
0
1
Apr 2, 2011
#1
  • Apr 2, 2011
  • #1
Long story short, I've got a 5.0 coming out of a totalled fox, has TFS Streetburner H/C/I, made 309whp and 337wtq. It's going into my new 93 LX vert. While the engine is out, my shop has to clean it up anyways and take the thing apart, so I was thinking of getting it bored over to 306 and putting Trick Flow flat top pistons in. Maybe up compression a little. After that, the only power mod I've been considering is a Zex wet kit, small, prolly 75 or 50 shot.

The car is gonna be mostly a weekend cruiser, driven 2 or 3 days a week. It'll probably see a handful of passes at the 1/4 or 1/8 mile once or twice a month in the summer and fall. Am I wasting my time on a stock block that is just going to explode, or should it be fine for the power/use I'm looking for?
 

FastDriver

I was uncomfortably high & wearing a helmet
SN Certified Technician
Sep 5, 2001
6,105
2,714
224
Vass, NC
Apr 2, 2011
#2
  • Apr 2, 2011
  • #2
Tune it right, and it will be fine. The guy that bought my old combination made 307 rwhp/330rwtq with it n/a (a little less than I did). Then he added a zex 125 shot and made 450rwhp and 500 ft-lbs and drove it for about a year before he sold it. I don't know what happened to it afterwards.

Chris
 

281pony

Active Member
Aug 31, 2003
2,681
2
46
Oly, WA
Apr 2, 2011
#3
  • Apr 2, 2011
  • #3
that will make sub-400 rwhp, your fine with a stock block. just get a good tune, that is your best friend.
 

90lxcoupe

20+ Year Stangneter
Oct 7, 2003
3,596
350
134
Apr 2, 2011
#4
  • Apr 2, 2011
  • #4
youll be fine if it runs right, a friend of mine has been beating the bag outta his 302 with a 175 kit for about 2 summers now and its holding up just fine
 

KingofBattle119

New Member
Dec 21, 2008
17
0
1
Apr 3, 2011
#5
  • Apr 3, 2011
  • #5
Okay great, thanks a lot guys. I was already feeling pretty good about this, was just looking for some second opinions.
 

281pony

Active Member
Aug 31, 2003
2,681
2
46
Oly, WA
Apr 3, 2011
#6
  • Apr 3, 2011
  • #6
KingofBattle119 said:
Okay great, thanks a lot guys. I was already feeling pretty good about this, was just looking for some second opinions.
Click to expand...

just make sure you get a good tune. people run alot more power then your aiming for, with no issues, but it's all in the tune.
 

90lxcoupe

20+ Year Stangneter
Oct 7, 2003
3,596
350
134
Apr 4, 2011
#7
  • Apr 4, 2011
  • #7
281pony said:
just make sure you get a good tune. people run alot more power then your aiming for, with no issues, but it's all in the tune.
Click to expand...

Dont really need a "tune" Just back the timing off a few degrees. From what i remember he didnt change anything with a 75 shot and retarded the timing 4 or 6 degrees with the 175 kit.
 

FastDriver

I was uncomfortably high & wearing a helmet
SN Certified Technician
Sep 5, 2001
6,105
2,714
224
Vass, NC
Apr 4, 2011
#8
  • Apr 4, 2011
  • #8
Definitely not the right way to do things, 90. retarding the timing doesn't correct a deficient AFR. Adding nitrous certainly has the potential to lean things out in a big way.
 

90lxcoupe

20+ Year Stangneter
Oct 7, 2003
3,596
350
134
Apr 4, 2011
#9
  • Apr 4, 2011
  • #9
FastDriver said:
Definitely not the right way to do things, 90. retarding the timing doesn't correct a deficient AFR. Adding nitrous certainly has the potential to lean things out in a big way.
Click to expand...

Should have specified, he is not using a dry kit, it uses a fitting on the stock line to a fuel solenoid that is part of the nitrous kit. Car has never seen a dyno, made a good ammount of passes and had a lot of nitrous run thru it on the street. Runs good, idles better than my car did with a tune in it. haha
 

FastDriver

I was uncomfortably high & wearing a helmet
SN Certified Technician
Sep 5, 2001
6,105
2,714
224
Vass, NC
Apr 4, 2011
#10
  • Apr 4, 2011
  • #10
Can the fuel solenoid be adjusted to lean or richen the mixture?
 

90lxcoupe

20+ Year Stangneter
Oct 7, 2003
3,596
350
134
Apr 4, 2011
#11
  • Apr 4, 2011
  • #11
FastDriver said:
Can the fuel solenoid be adjusted to lean or richen the mixture?
Click to expand...

sure can! Thats why theres a fuel jet for each nitrous jet.

To the OP, i think your wasting your money on doing a 306 on a stock block, just hammer the stock bottom end till somthing breaks. Removing .030'' of material from each hole on the block is only going to further weaken the block IMO, and you wont make that much more power with 4 cubic inches difference.

The stock 302 pistons have alot of meat on them and thats why i think that a tune isnt needed for the juice. My buddies car gets its ass handed to it every time its sprayed and just asks for more. Just stay consistent on the bottle pressure and read the plugs. A plug reading is going to tell you alot more than a number on a wideband that is reading an accumulation of exhaust favoring one side of the motor. Also, dont turn the nitrous on too early, put a window switch on it activating it at whatever the motor peaks at naturally aspirated and use a WOT switch to activated the window switch.
 

FastDriver

I was uncomfortably high & wearing a helmet
SN Certified Technician
Sep 5, 2001
6,105
2,714
224
Vass, NC
Apr 5, 2011
#12
  • Apr 5, 2011
  • #12
90, does the fuel solenoid automatically accomodate lower bottle pressure, or will it cause an overly rich condition?
 
You must log in or register to reply here.

Similar threads

S
Preparation for Holley Terminator X install – Foxbody 306 (electrical fan, alternator, MSD Ignition, etc)
  • So_Flo
  • Mar 1, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
22
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 4, 2026
General karthief
B
water pump installation questions
  • B0udreaux
  • Feb 5, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
38
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Feb 28, 2026
General karthief
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
S
Requesting Guidance for 306 motor swap - Fuel? - SD? MAF?
  • So_Flo
  • Jul 26, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
32
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jan 4, 2026
Mcmahst
Might have to get a Dart block but don't want to and if I do, then 363 instead of 331. Thoughts on what I've already bought so far.......
  • from6to8
  • Jul 8, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2 3
Replies
52
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jul 9, 2025
from6to8
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
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?