Man­i­fold Ma­nia

Se­lect­ing the Right Coy­ote In­take Man­i­fold

Street Rodder - - Contents - By Mark Gearhart Pho­tog­ra­phy by the Au­thor

Se­lect­ing the right coy­ote in­take man­i­fold

Fri­day evening and a freight truck just pulled up out­side your house. Down comes the lift gate with a gi­ant crate. Oh great! It’s not Christ­mas but it might as well be as the heart for your project has just ar­rived.

Be­low the box top and be­neath the bil­lows of pack­ing paper lies your pride and joy; a fac­tory fresh long-block com­plete with a war­ranty. De­pend­ing on your fla­vor, one of these late-model en­gines could be an LS-vari­ant, LT1, or Coy­ote. Re­gard­less of the se­lec­tion most of these fac­tory com­pos­ite man­i­folds just don’t look that great. Not to fret with re­gret, there’s a so­lu­tion for ev­ery­one out there. In this seg­ment, we will be re­view­ing the pop­u­lar in­take man­i­folds avail­able on the mar­ket, what they look like, their di­men­sions, and what to ex­pect from them.

The Stock GT Man­i­fold

Ford did a fan­tas­tic job en­gi­neer­ing the stock Coy­ote 5.0 in­take man­i­fold. The long run­ners-in-a-box–style GT man­i­fold cre­ates a del­i­cate

bal­ance of horsepower and torque. The rel­a­tively small 302ci dis­place­ment from the Coy­ote typ­i­cally cre­ates peak torque around 5,200-5,500 rpm. Its low pro­file de­sign places the run­ners into the val­ley of the en­gine. With the plenum cover at­tached, the over­all height in­crease above the top of the valve cov­ers is less than 2 inches.

There are two dif­fer­ent types of GT man­i­folds.

The 2015-2017 sec­ond­gen­er­a­tion Coyotes in­cluded Charge Mo­tion Con­trol Plates built into the in­take man­i­fold. The

2018 di­rect-in­jected 5.0 has the best long-run­ner man­i­fold de­sign yet is still very new to the mar­ket. The eas­i­est way to tell if your en­gine is equipped with this newer man­i­fold is the gag­gle of vac­uum lines on the back­side of the plenum. Un­like first-gen­er­a­tion IMRCs, these plates are de­signed to fold flat in the run­ner to re­duce re­stric­tion un­der ac­cel­er­a­tion. The plates in­crease port ve­loc­ity un­der low en­gine speeds, which help in­crease torque.

Over­all height of a 2011-2014 stock in­take man­i­fold (mea­sured from the cylin­der head flange) is 5.74 inches.

The Con­tenders

It goes without say­ing that any in­take man­i­fold up­grade should be ac­com­pa­nied by chas­sis dyno tun­ing by a pro­fes­sional. This is more im­por­tant on 2015-plus crate en­gines be­cause all af­ter­mar­ket vari­ants (ex­cept for the GT350 plenum) elim­i­nate the func­tion­al­ity of the Charge Mo­tion Con­trol plates and thus will re­sult in a check-en­gine light. This

can be eas­ily reme­died dur­ing the tun­ing process without any neg­a­tive side ef­fects. The one man­i­fold we will not be talk­ing about to­day is from the GT350, since we are af­ter man­i­folds that will bring a bet­ter vis­ual ap­pear­ance to the en­gine bay of your project.

The main man­i­folds we will be dis­cussing to­day in­clude:

Ford Per­for­mance Parts BOSS 302, PN M-9424-M50BR

Ford Per­for­mance Parts Co­bra Jet, PN M-9424-M50CJ Edel­brock Vic­tor II, PN 7180 Hol­ley Sniper (Street Se­ries), PN 829031

Ford Per­for­mance Parts BOSS 302

We will start things off with the first per­for­mance man­i­fold in­tro­duced for the Coy­ote en­gine plat­form: the BOSS 302. Equipped as the fac­tory in­take man­i­fold for 2012-2013 BOSS 302 Mus­tangs, this in­take man­i­fold will in­crease the Coy­ote’s ef­fec­tive power­band by 1,000 rpm and add about 35 hp. This means that with a proper tune the 5.0 will steam past 7,400 rpm with stock camshafts. Ex­pect about a 17 lb-ft of torque loss due to the 2.85-inch shorter run­ners. Although the run­ners on the BOSS 302 man­i­fold are shorter, the man­i­fold it­self is still taller than the GT man­i­fold by 2.35 inches. This is be­cause the GT’s “run­ners in a box” man­i­fold fea­tures a longer, ta­pered run­ner.

The com­pos­ite BOSS 302 man­i­fold has a clas­sic de­sign with its long stripes on the top of the plenum.

The fac­tory com­pos­ite man­i­fold has a clean con­struc­tion. In­stal­la­tion is straight for­ward and sim­ple … given you have the ad­di­tional hood clear­ance. Most air in­takes will adapt to the raised in­let by be­ing clocked slightly and the stock 2011-2017 throt­tle body will di­rectly trans­fer. Also, the in­take man­i­fold’s purge valve will be re­lo­cated off the man­i­fold. Ford also of­fers a molded foam in­jec­tor cover up­grade (PN M-9680-BOSS) that cov­ers up the in­jec­tors and as­so­ci­ated heater core lines.

Over­all height (mea­sured from the cylin­der head flange) is 9.93 inches back, 9.16 inches front.

Ford Per­for­mance Co­bra Jet

To squeeze ev­ery ounce of power from your Coy­ote en­gine, the Co­bra Jet ranks as one of the top man­i­folds to buy. The over­all con­struc­tion of the CJ man­i­fold is very sim­i­lar to the BOSS 302, though sits slightly shorter due to the lack of the raised stripes run­ning down the man­i­fold.

The area around the in­jec­tor has been smoothed out for bet­ter air­flow and the strut tower brace re­cess has been re­moved. But per­haps the big­gest change is the GT500-style oval throt­tle body. With oval tub­ing tak­ing up more real es­tate and harder to fab­ri­cate than round, this might be a lim­it­ing fac­tor if there’s not suf­fi­cient clear­ance

be­tween the front of the en­gine to the ra­di­a­tor. Also, the move to a GT500style throt­tle body is re­quired.

The Co­bra Jet man­i­fold is all busi­ness; it of­fers a dif­fer­ent, racier look when com­pared to the BOSS 302, though is con­structed of the same qual­ity. This man­i­fold will be good for 10-15 more horsepower and torque over the BOSS 302 while revving around another 100 more RPM. The same in­jec­tor cov­ers listed for the BOSS 302 will also work on the Co­bra Jet.

Over­all height (mea­sured from the cylin­der head flange) is 9.76 inches back, 8.96 inches front.

Edel­brock Vic­tor II

If you’re look­ing for a sta­ple af­ter­mar­ket brand’s man­i­fold for your street rod, the Edel­brock Vic­tor II might be your choice. Ex­ter­nally, the Vic­tor II re­sem­bles a sim­i­lar look to the BOSS 302 but this man­i­fold is made from cast alu­minum and its stripes are ma­chined into the cast­ing. While we haven’t tested the Vic­tor II, we would sus­pect that the slightly longer run­ners would put this man­i­fold close to the BOSS 302 horsepower with torque sim­i­lar to the GT man­i­fold. This would also be on par with Edel­brock’s power claims. The Edel­brock man­i­fold will accept all the stock emis­sion pro­vi­sions, fuel rails, and throt­tle body.

For those that want to get sneaky, Edel­brock cast in di­rect port ni­trous bosses onto the bot­tom of the man­i­fold for those dar­ing to add a lit­tle spray into the mix.

Over­all height (mea­sured from the cylin­der head flange) is 8.09 inches back, 8.24 inches front.

Hol­ley Sniper (Street Ver­sion)

Com­ing in as the short­est over­all man­i­fold in the af­ter­mar­ket bunch is

the Hol­ley Sniper in­take man­i­fold. Also of­fered in a larger race ver­sion, as well as in black or pol­ished, this man­i­fold gives a fully fab­ri­cated look. Hand welded from 1/8-inch-thick T-6061 alu­minum, Hol­ley’s man­i­fold fea­tures a short run­ner con­fig­u­ra­tion that’s de­signed for top end horsepower. Un­like the other man­i­folds in the lineup, the Hol­ley man­i­fold does not fea­ture a ta­pered plenum de­sign. Ex­posed trum­pets in the plenum al­low for the Sniper man­i­fold to sit shorter without sac­ri­fic­ing a lot of low end torque.

Hol­ley does in­clude an adap­tor to accept the stock throt­tle body but doesn’t have pro­vi­sions for the fac­tory crank­case hoses and is prob­a­bly best paired with a set of valve cover breathers. A va­ri­ety of NPT ports tapped into the bot­tom of the man­i­fold al­low for brake booster and an­cil­lary vac­uum hookups.

Over­all height (mea­sured from the cylin­der head flange) is 6.73 inches back, 6.82 inches front.

The stock 2011-2014 GT man­i­fold fea­tures a run­ners-in-a-box de­sign that in­cor­po­rates a long, ta­pered run­ner. From the head’s flange to the top of the man­i­fold is only 5.74 inches tall, which al­lows the GT man­i­fold to sit low for max­i­mum hood clear­ance.

The tallest to short­est man­i­folds side by side: The BOSS and Co­bra Jet’s over­all heights are sim­i­lar: 9.93 and 9.76 inches, re­spec­tively. The mid­dle man is the Vic­tor II with a max­i­mum rear plenum height of 8.24 inches. The short­est of the bunch is Hol­ley’s Sniper that doesn’t fea­ture a ta­pered plenum and comes in at 6.82 inches mea­sured at the man­i­fold’s raised logo.

The BOSS 302 in­take man­i­fold was the first per­for­mance man­i­fold made for the Coy­ote en­gine plat­form. It was of­fered on the 2012-2013 BOSS 302 Mus­tangs and its short run­ner con­struc­tion in­creases top-end power and the up­per rev limit.

The Ford Per­for­mance Co­bra Jet man­i­fold is all busi­ness. A sim­ple top plenum de­sign elim­i­nates the fac­tory strut bar re­cess to in­crease vol­ume. This man­i­fold is a smidgen shorter than the BOSS 302 due to the lack of raised ac­cent stripes.

The claim to power fame with the Co­bra Jet man­i­fold is the oval-style GT500 throt­tle body. This will re­quire an oval to round tran­si­tion in­take pipe and the clear­ance in front of the en­gine to go along with it.

The stock man­i­fold fills the val­ley of the Coy­ote en­gine while the BOSS stands tall above it. The stock throt­tle body and breather lines are a straight swap to this man­i­fold.

Edel­brock’s Vic­tor II is built from cast alu­minum and is cur­rently the only cast Coy­ote man­i­fold on the mar­ket. It’s a di­rect bolt-on and re­tains all the same func­tion­al­ity as the stock man­i­fold.

Semi cross ram–style run­ners ex­tend into the lower plenum like the Hol­ley Sniper but with more ta­per. The run­ners are longer than the BOSS 302 (9.81 inches) and Co­bra Jet to help pre­serve low-end torque.

The Vic­tor II also has stripes run­ning down the length of the man­i­fold but they are ma­chined into the top and not raised like the BOSS 302.

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