Two new Edelbrock 15-degree SB Chevrolet designs from Mike’s Racing Heads

By Sam Logan

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Mike Androwick of Mike’s Racing Heads has been a cylinder head porter all his life. In NHRA Pro Stock he worked alongside Richard Maskin, Bob Glidden and Larry Morgan. In big-block Modified oval track racing series in the northeast, he provided 60 sets of racing heads, winning the 2013 championship with Brett Hearn.


For 2014 he has prepared a new small-block innovation based on the Edelbrock 15-degree cylinder head. His two new designs are the 270cc (for short track ovals) and 300cc (for drag racing).


 

Concord NC: Mike’s Racing Heads has developed two new competition cylinder heads for small-block Chevrolets.

Derived from the Edelbrock 15-degree head (part number 77549) one features 270cc intake volume runners and is developed for short track oval racing engines up to 364cu in, either dirt or asphalt. The other is endowed with 300cc intake volume runners and created for small-block drag racing.

MRH-Seats&ShortTurn-web

Needless to say, throttle response and drivability represent the most critical factors in short track oval engines, thus much attention was placed on the cross-sectional areas and port velocities. “The size of the engine and rpm range, “explains Mike Androwick, “dictates the size of the runners—not so much in volume but in cross-sectional area.”

 

Peak flow in each intake tract is MRH-LgTurn&Guides-webreported at 370cfm and 267cfm exhaust—hence creating sufficient airflow to produce ample peak horsepower. Moreover, intake and exhaust valves are sized at 2.150in and 1.625in respectively with 50-degree seat angles while the combustion chambers measure 47cc. The heads are machined to suit 4.155in bores.

 

Drag Race

MRH racing headMike’s 300cc intake volume runners are designed for small-block drag racing engines of 400-434cu in displacement. Flowing 397cfm in the intake ports and 273cfm in the exhaust, they propel a noteworthy amount of air considering their inline-valve configuration. Operating with intake and exhaust valves sized at 2.180in and 1.625in respectively, they use 50-degree seat angles and take advantage of 47cc combustion chambers in common with their oval track counterpart. These drag race heads are machined to suit a bore size of 4.155in.

Both drag race and oval track head designs operate with shaft-mounted rockers (Jesel Pro series part # KPS-01009). In addition, Mike offers competition-ported intake manifolds for both racing heads.

Finally, for those with the daring and flair to design their own racing heads, you can send your sample to Mike’s Racing Heads, which they will scan, program and, using a 5-axis machining center, complete your own proprietary design for you. People are clever creatures it’s never too late to begin.

             Mikes Racing Heads Flow Chart at 28 inches of water

  300cc for Drag Race Applications            270cc for Oval Track Applications

Valve Lift (in)

Intake (cfm)

Exhaust (cfm)

0.100

66

56

0.200

142

116

0.300

213

175

0.400

268

232

0.500

326

254

0.600

369

264

0.650

382

267

0.700

395

270

0.800

397

273

Valve Lift (in)

Intake (cfm)

Exhaust (cfm)

0.100

65

54

0.200

145

115

0.300

219

166

0.400

284

216

0.500

337

243

0.600

365

258

0.650

366

262

0.700

368

265

0.800

369

267

 

 For further information contact:

Mike’s Racing Heads

4555 Motorsports Dr. SW, Suite 110,

Concord, NC  28027

Telephone (704) 654-6079 or email: Mike@MikesRacingHeads.com

Or visit MikesRacingHeads.com

3 Comments

  1. These heads are for the Gen 1 small block non-LS engines correct?

    Reply
  2. Yes Paul that’s correct, Gen 1 Chevrolet small-block

    Vic

    Reply
  3. I’d be interested in a price with shaft rockers, intake, and whatever needed to switch from my 23° setup to this combo.

    Reply

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