Ford Maverick / Mercury Comet Forums  

Mobile Tags Register Gallery
Go Back   Ford Maverick / Mercury Comet Forums > Maverick/Comet Forums > General Maverick/Comet


Thread Tools Display Modes
Old 2003-07-07, 10:14   #1
Join Date: 2003-05-29
Location: Reynoldsburg, Ohio
Posts: 80
Vehicle(s): 73 maverick
iTrader: 0 (0%)
stock 302 crank

How many rpm's do you think a stock 73 302 can take without breaking.
Also, how much nitrous oxide can the stock rods and crank take after I have them checked and reconditioned and new rod bolts added.
I would like to use 175 or even a 200 shot. Also, I am going to use forged pistons and a main girdle.
I will be able to fix or replace 302 parts as opposed to a stroker motor if it comes apart.
I am not sold yet on how much more power a stroker or 351 will make over a 302/306.
Thanks Steve
73 Maverick
stock 302,rpm manifold,750 holley
cityboy is offline   Reply With Quote
Sponsored Links
Old 2003-07-07, 10:47   #2
.....John Ford.....
PINKY's Avatar
Join Date: 2002-03-10
Location: Louisville, Ky.
Posts: 9,875
Vehicle(s): 1970 Ford Maverick
iTrader: 12 (100%)
Images: 60
I have been doing alot of research on NOS. The BIG problem people run into when running NOS is their fuel system. If you do not have enough fuel, you will run lean, and thats bad. I have a chart at home that gives you the amount of fuel needed to run NOS according to the shot. If I remember correctly a 150 shot requires 7-8 PSI of fuel to be used safely. I would not recommend running NOS on a stock fuel pump. Get you a Holley "blue" or better with a fuel pressure regulator. I am always reminded of the words I read in a magazine: "error on the side of over-kill". Good luck.
PINKY is offline   Reply With Quote
Old 2003-07-07, 13:06   #3
Join Date: 2003-01-09
Posts: 67
iTrader: 0 (0%)

My friend turns his 8000 to 8500 all the time im not joking. It has been going for 2 years. Races most weekends. Shifts at 7500 most of the time. Roller camed victor jr headed .060 over 302
Darracq is offline   Reply With Quote
Old 2003-07-07, 15:18   #4
Senile Member
Help support the Maverick/Comet Forums by becoming a Supporting Member
bmcdaniel's Avatar
Join Date: 2002-07-02
Location: York. PA
Posts: 5,298
Vehicle(s): '70 Maverick Grabber
iTrader: 8 (100%)
Images: 6
Like Maverick 5946 said, you don't want to go lean. You also don't want the nitrous to flow at too low rpm and the timing needs to retard. A good nitrous controller like the Jacobs Nitrous Mastermind is a good place to start. Forged pistons and reworked rods are necessary for the power level your talking about and a steel crank is also recommended (not necessarily billet, cast steel should be ok). I'm running a stock crank, rods, cast pistons, and a Carter high volume mechanical pump, but only with a 125 hp spray. Timing retards 6 deg, rev limit set at 5000. My car is a cruiser, not a bruiser, the cam tops out at 5000 rpm. The Jacobs controller babysits the motor for me so I don't hurt it. It is also very important to run a high energy ignition and electronic switched distributor- no points because they bounce.
bmcdaniel is offline   Reply With Quote
Old 2003-07-07, 16:24   #5
mavman's Avatar
Join Date: 2002-03-09
Location: Arkansas
Posts: 1,969
Vehicle(s): '75 Maverick, '03 super duty, '04 Mustang Vee-six!
iTrader: 2 (100%)
Images: 2
I seriously doubt you'll break a 302 crank. I personally have never seen one let go. It's usually the block that breaks first at around 600 HP.
mavman is offline   Reply With Quote
Old 2003-07-08, 08:15   #6
CometGT1974's Avatar
Join Date: 2002-03-12
Location: Western NC
Posts: 1,581
Vehicle(s): 74 Comet GT
iTrader: 12 (100%)
Images: 9
Mavman is right, it's not necessarily the crank that is weak. The weakest link in most "HIGH" horsepower (302) applications is the block. I have seen the front of a block split apart and that allowed the front of the crank to break. This was on a motor that had well over 100,000 miles on it and had seen many, many bottles of nitrous but nothing bigger then a 150 shot!!
CometGT1974 is offline   Reply With Quote
Old 2003-07-08, 21:49   #7
Drag racing nut
bossmav's Avatar
Join Date: 2002-06-25
Location: Harrisonburg, Va
Posts: 753
Vehicle(s): 74 Grabber now Pearl white
iTrader: 1 (100%)
I agree, but doesn't the block crack from the side load after the crank starts to walk from the extra pressure of NOS? If you don't have the bottom build strong enough to hold the extra horses the block and crank can give away. Just a thought!

Terry Gates
AKA Bossmav
I don't drive fast... I just fly low!

"I have been crucified with Christ; it is no longer I who live, but Christ lives in me; and the life which I now live in the flesh I live by faith in the Son of God, who loved me and gave Himself for me." (Gal. 2:20)
bossmav is offline   Reply With Quote
Old 2003-07-09, 00:46   #8
Join Date: 2002-11-09
Location: Saskatchewan ,Canada
Posts: 261
Vehicle(s): 1971 comet GT
iTrader: 0 (0%)
Same here I have only seen one windowed 302 . It was behind a 4 speed that let go in the air .
Still ran though ...........kinda cool actually
Lightning is offline   Reply With Quote
Old 2003-07-10, 08:11   #9
Old Guy
Join Date: 2002-03-09
Posts: 1,286
iTrader: 8 (100%)
Crankshafts etc.

Thought I would put in few words here, stock cranks are pretty tough little buggers. Have one in mine that is over ten yrs old and has been dragged raced for all that time, anywhere from 6 to 8 thousand burn outs and currently being shifted at 7200. This is on the motor only, laughing gas is not my thing. Would advise to radius the oil holes on the journals and make sure the end play is correct. When I build a bottom end I snug up all main caps except the thrust bearing, pry the crank foward and hold it then tighten it down. this aligns the two bearing shells so the crank can move back and forth as required. Torque the bolts or studs, in two or three incremnts of the total torque for which ever ones you use. I would invest in a good set of H beam rods with the 7/16th bolts bottled gas can be a real grenade on stock rods and puny bolts along with the slugs attached to them. Reminds me of the old commercial of "Pay me now or pay me later " Have also blown to stock balancers apart this year at 7200 rpm so got a semi cheap fluid unit off ebay and did see some vibrations go away. Just a few things to think about.
Old Guy is offline   Reply With Quote
Old 2003-07-11, 07:38   #10
Join Date: 2003-05-29
Location: Reynoldsburg, Ohio
Posts: 80
Vehicle(s): 73 maverick
iTrader: 0 (0%)
Old Guy,
Thanks for the info, I will look @ all of these things and if you or anyone else have any more suggestions, let me know.
Also, what do you think about notching my shock towers and putting in a 351 windsor?
Thanks Steve
73 Maverick
stock 302,rpm manifold,750 holley
cityboy is offline   Reply With Quote

Interested in this thread?
Receive email updates and post your own response by registering today, it's free!


Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
will a 302 boss crank go into a 302 block obmav Technical 14 2007-06-14 12:17
2MAE 302 crank - 50 oz or 28 oz balance? Cleaver Technical 3 2006-09-04 00:28
Times for Stock '72 302 JonnyRebel Drag Racing 10 2005-06-21 09:54
302 with 351w crank rods? Kilg0re Technical 9 2004-12-22 23:23
horse power of a stock 302? newbie Technical 4 2003-01-21 18:25

All times are GMT -5. The time now is 12:26.

Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.