IF ANYONE IS CONSIDERING PUTTING THESE HEADS ON THEIR CARS...CONSULT ME FIRST...I HAD SOME REAL PROBLEMS. CONCERNING MATING OF THE INTAKE AND GASKETS. I HAVEN'T FIRED UP THE MOTOR YET BUT I'M HOPING IT WAS WORTH THE HASSLE.

 

There are 2 types of small block heads. 18 and 23 degree. If you tryed to mate an 18 degree intake on 23 degree heads then yes, the bolts won't line up properly.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

No stephen i got the 23 degree heads. the main problem was i was getting a gap between the intake and the valley. I had to get the intake welded up and mr.gasket 100 intake gaskets in order for everything to mate up properly. I wish summit would have told me this was not going to work for my application.