CAR CRAFT Magazine Ford 302 Build - March 2016

Discussion in 'Technical' started by Maverick Dude, Dec 30, 2015.

  1. Maverick Dude

    Maverick Dude Member

    Joined:
    May 23, 2015
    Messages:
    991
    Likes Received:
    269
    Trophy Points:
    197
    Garage:
    1
    Location:
    Cranbrook, BC Canada
    Vehicle:
    1973 Maverick Two Door 302 C4 LDO
    The Car Craft guys pulled a roller cam 302 with stock GT-40 heads from 1996-2001 series Explorer, freshened it up and installed a Ford B303 cam, a Trick Flow valve spring and retainer kit, MSD distributor, Holley 625 Street Demon carb, and Summit Street and Strip Stage 1 dual plane intake.
    With a set of long tube dyno headers it made 325 HP @ 5800 RPM and 325 lb-ft at 4200 RPM. Total cost excluding the headers was about $1400. Not bad for a low budget.

    MD
     
  2. Dave B

    Dave B I like Mavericks!

    Joined:
    Mar 9, 2002
    Messages:
    16,931
    Likes Received:
    214
    Trophy Points:
    347
    Location:
    Parts Unknown......
    Vehicle:
    3 Grabbers
    I've got one sitting on my engine stand. Cheap power
     
  3. Krazy Comet

    Krazy Comet Tom

    Joined:
    Sep 13, 2012
    Messages:
    7,561
    Likes Received:
    2,319
    Trophy Points:
    531
    Garage:
    1
    Location:
    Chesapeake VA
    Vehicle:
    1972 Comet GT clone 306 . 1969 Fairlane Cobra 428CJ 1988 T-Bird awaiting 331 ..
    Meee too(mine is a '98)...

    BUT the '97.5 up uses the GT40P heads, no problem for Fox chassis vehicles but finding headers to fit heads and our chassis is gonna be tuff...
     
  4. Dave B

    Dave B I like Mavericks!

    Joined:
    Mar 9, 2002
    Messages:
    16,931
    Likes Received:
    214
    Trophy Points:
    347
    Location:
    Parts Unknown......
    Vehicle:
    3 Grabbers
    Mine came out of a 96 Explorer I bought a few years back. It has the GT40 heads.
     
  5. bmcdaniel

    bmcdaniel Senile Member

    Joined:
    Jul 2, 2002
    Messages:
    6,740
    Likes Received:
    635
    Trophy Points:
    318
    Location:
    York. PA
    Vehicle:
    '70 Maverick Grabber
    I ran P heads on mine years ago, my old Blackjack headers bolted right up. Just a small amount of grinding on the header flanges was need so that I could get a spark plug socket (modified) in there.
     
  6. rotorr22

    rotorr22 Member

    Joined:
    Jun 30, 2008
    Messages:
    1,302
    Likes Received:
    259
    Trophy Points:
    211
    Location:
    Columbiana, Ohio
    Vehicle:
    2018 F150 XLT/5.0, 2014 Focus 5 spd manual,1974 Maverick Grabber, 1986 Thunderbird Elan 5.0/AOD
    Another Car Craft 302 build:16suspect:
     
  7. Crazy Larry

    Crazy Larry Member

    Joined:
    Jul 16, 2005
    Messages:
    3,557
    Likes Received:
    603
    Trophy Points:
    287
    Location:
    Wichita, Kansas
    Vehicle:
    '73 Maverick 2-door, 302, manual trans
    So they went into the future and did this? March is still 3 months away.

    Wow, those GT-40 heads must flow better than I thought.
     
  8. dyent

    dyent Member

    Joined:
    Jan 29, 2012
    Messages:
    1,144
    Likes Received:
    432
    Trophy Points:
    258
    Location:
    vancouver bc
    Vehicle:
    1973 Comet 2 dr., 302 w/AR aluminum heads, Toploader 4 spd, 9" Trac-Lok w/3.70
    this maybe a little off the topic, but I don't think people realize just how much power a stock 302 from our Mav/Comet actually makes. When I sold my 74 Mav back in May to a fellow in Belfair WA, he has many cars that he races and one of them is a 72 Comet in the Sportsman Class on a index of 13.65
    class rules:
    stock body and full interior
    stock 302 w/original head, 2 barrel intake/carb etc
    motor can have upgraded parts for reliability, such as arp rod bolts, but cam/valves etc., must be to OEM specs.
    c4 does have shift kit and still stock 8" w/5.14 spool and slicks

    so all things considering to make a 2800 lb car turn 13.65 at close to 100mph, you're running around 300 horses! and what did Ford list the output of these motors???
    best time he has run was 13.25 @ 101
    Brian Seaberg is his name and here is posting of one of his races
    http://pacificraceways.com/may-30-2015-super-saturday-heads-up-racing/
    David
     

    Attached Files:

    Last edited: Dec 31, 2015
  9. Crazy Larry

    Crazy Larry Member

    Joined:
    Jul 16, 2005
    Messages:
    3,557
    Likes Received:
    603
    Trophy Points:
    287
    Location:
    Wichita, Kansas
    Vehicle:
    '73 Maverick 2-door, 302, manual trans
    A stock 302 puts out anywhere from 138 to 210 horsepower depending on the year.
    No, they're not making 300hp. And you'd have to spin some serious RPM to go 100mph with 5.14 gears, which is not likely on a stock-headed 302 with stock cam and 2-barrel carb.

    Someone's math is incorrect. Either that or it was an eighth-mile run.
     
  10. dyent

    dyent Member

    Joined:
    Jan 29, 2012
    Messages:
    1,144
    Likes Received:
    432
    Trophy Points:
    258
    Location:
    vancouver bc
    Vehicle:
    1973 Comet 2 dr., 302 w/AR aluminum heads, Toploader 4 spd, 9" Trac-Lok w/3.70
    Nope, 1/4 mile, again check out his time on the last posting 13.65 @ 95.56 and cross the traps 5000-5500 rpm, so not excessive for stock 302. Here's another one of his races http://bremertonraceway.com/Race Results 2015/may_31.htm

    Update: Just finished talking to Brian, my mistake, 4.62 gears, best time was 13.25 @ 99 mph and
    crossing the stripe @ 6000 rpm.
    Went to 9 finals, won all including 6 walley's, also went on to win the 2015 NHRA Summit
    Drag Racing Series NW Division at Boise, Idaho http://www.draglist.com/2015/09/07/...cing-series-northwest-division-final-results/

    Not trying to get into a heated discussion, just merely stating the stock 302 that came in our Mav/Comets has more performance capability than most people realize.
    Sorry to have got off topic on this post, but it would be interesting if someone has any info on real test results as to what these motors actually puts out. Maybe I can talk Brian into putting his motor on the dyno next time he pulls it out. Anyone who has actually done drag racing at a proper track, gone through "tech" knows what it takes to run 100 mph. Times that Brian runs, I am sure that stock motor got to be putting out more than 200 or 210 horses.
    Shoot, my built up 289 that I had in my 74 Comet some 25 years ago, did only 14.77 @ 96 mph at same Bremerton Raceway, 3.70 gears with crappy Bridgestone street tires, no traction what so ever, that motor was putting out around 270..........
    Anyways, Happy New Year to you all!
    David


    NHRA Sportsman Stock class only allows:
    Stock
    Stock cars are similar to Super Stockers, but the rules regarding everything from engine modifications to body alterations are much stricter. Virtually any car is eligible to compete, and entries are classified using a system that divides factory shipping weight by NHRA-factored horsepower. Bodies must be unaltered and retain a full factory interior. Tires are limited to a maximum 9-inch-wide rear slick. Engines must be correct for the make and model vehicle and must retain stock cylinder heads, intake manifold, and carburetor. Modifications are limited to a basic balancing and rebuild with only a few performance enhancements.
    Stock Cylinder Heads
    Must be correct casting number for year and horsepower claimed, perNHRA Technical Bulletins or NHRA accepted. Porting, polishing, welding,epoxying and acid-porting prohibited. Combustion-chamber modificationsprohibited. Cylinder heads are additionally restricted in that theymust retain original-size valves at original angles +/- 1 degree andmust be able to hold original cylinder-head volume per NHRASpecifications.
     
    Last edited: Dec 31, 2015
  11. Maverick Dude

    Maverick Dude Member

    Joined:
    May 23, 2015
    Messages:
    991
    Likes Received:
    269
    Trophy Points:
    197
    Garage:
    1
    Location:
    Cranbrook, BC Canada
    Vehicle:
    1973 Maverick Two Door 302 C4 LDO
    Yep, good old Car Craft. I'm waiting for the January 2017 edition which which should arrive any day now! :biglaugh:

    MD
     
  12. Maverick Dude

    Maverick Dude Member

    Joined:
    May 23, 2015
    Messages:
    991
    Likes Received:
    269
    Trophy Points:
    197
    Garage:
    1
    Location:
    Cranbrook, BC Canada
    Vehicle:
    1973 Maverick Two Door 302 C4 LDO
    Hey David. I used the HP calculator from wallaceracing.com and using 13.65 and 2800 lbs, it calculated 217 HP , but the program is very basic and does not take into account gear ratios etc. Want to check your numbers? Greg

    This might be more believable with a stock 302 spun at 6000 rpm. For a 1973 302, Ford reported 140 HP at 4200 rpm and 235 ft-lbs at 2400 rpm. At 4200 rpm, 140 HP back calculates to 175 ft-lbs of torque. If somehow the racer managed to keep the torque from falling off and rev'd the engine to 6000 rpm he'd be making 200 HP, just short of the theoretical amount of 217 hp needed to get a 13.65 ET. Maybe he shined up the intake ports!

    MD
     
    NCFatBoy likes this.
  13. Crazy Larry

    Crazy Larry Member

    Joined:
    Jul 16, 2005
    Messages:
    3,557
    Likes Received:
    603
    Trophy Points:
    287
    Location:
    Wichita, Kansas
    Vehicle:
    '73 Maverick 2-door, 302, manual trans
    Of course that 138-140 rating was at the rear wheels in '73 (engine installed in the vehicle with all accessories connected -- there's no way to dyno that other than a chassis dyno).
    I wonder if the '68 Shelby Mustang GT350 was conservatively rated (250 hp)? The 289 hi-perf was not conservatively rated, It was actually putting out 271 hp with a solid lifter, 228° duration @ 050 and .470 lift cam, 470cfm 4-barrel, and high flow exhaust manifolds. Of course the 302 has a slightly longer stroke.

    I know other Ford engines were conservatively rated, such as the 428 Cobra Jet and the 351C 4V, but I seriously doubt that the '68-'76 302 was conservatively rated. Compression rations were down as well.
     
  14. Krazy Comet

    Krazy Comet Tom

    Joined:
    Sep 13, 2012
    Messages:
    7,561
    Likes Received:
    2,319
    Trophy Points:
    531
    Garage:
    1
    Location:
    Chesapeake VA
    Vehicle:
    1972 Comet GT clone 306 . 1969 Fairlane Cobra 428CJ 1988 T-Bird awaiting 331 ..
    No even SAE HP is still at crank, probably got 95-100 at the wheels...

    The pre '72 figures were basically lies, as installed with asthmatic 2bbl carb and single exhaust true ratings for a stock were generally 25-30% less than "advertised"... Those advertised HP figures were with no accessories or air cleaner, open dyno headers and optimized tune, SAE figures are as installed in car, with accessories operating...

    With headers, a free flowing carb & intake along with optimized tune it's easy to find probably 65Hp in about any stock 302... Stick a cam in it and there's another 30-40 Hp...

    The '80s 5.0 Stang rating of 225Hp was real, with a better headers, a bit of tune tweaking and free flowing exhaust system, could easily pickup another 25Hp...
     
  15. dan gregory

    dan gregory Member

    Joined:
    Mar 3, 2013
    Messages:
    835
    Likes Received:
    49
    Trophy Points:
    71
    Location:
    chesapeake va
    Vehicle:
    1970 maverick
    The problem w/ these mtrs is the hds,they are sooooo restrictive.Even though I don`t like them,look at 1.94 valve small blk chevy hds from that period(a dime a dozen),they are miles ahead of the Fords.
     
    Crazy Larry likes this.

Share This Page