| Casting # |
Years
made |
Valve
Size |
HP levels
used for |
Chamber Size / Notes |
| 3782461 |
61-70 |
1.94/1.50
& 2.02/1.6 |
250-375 |
64 CC Chambers
No bolt holes
These are the double humps. |
| 3890462 |
62-68 |
1.94/1.50
& 2.02/1.6 |
250-350 |
64 CC Chambers
No bolt holes
These are also double humps. |
| 3927185 |
69 |
1.72/1.50 |
200-210 |
70cc Chambers |
| 3927185 |
69 |
1.72/1.50 |
200-210 |
70cc Chambers |
| 3917293 |
68 |
1.72/1.50 |
210 |
76cc Chambers |
| 3917291 |
62-69 |
1.94/1.50
& 2.02/1.6 |
275-350 |
64 CC Chambers
No bolt holes
These are the 'Turbo' heads. |
| 3927186 |
68-72 |
1.94/1.50
& 2.02/1.6 |
290-370 |
64 CC Chambers
has bolt holes
These are the 'powerpack' heads. |
| 3932441 |
67-79 |
1.94/1.50 |
250 & 255 |
76 CC Chambers
Intake flow 152 CFM
Exhaust flow 93.2 CFM |
| 3947040 |
68-70 |
1.94/1.50
& 2.02/1.6 |
290-370 |
64 CC Chambers |
| 3947041 |
68-70 |
1.94/1.50
& 2.02/1.6 |
290-370 |
64 CC Chambers |
| 3973414 |
64-70 |
2.02/1.6 |
360 & 370 |
64 CC Chambers
Z-28 & Corvette LT-1. |
| 3973487 |
68-79 |
1.94/1.50
& 2.02/1.6 |
165-330 |
76 CC Chambers
X casting has 10 more intake
cc volume. |
| 3998993 |
68-79 |
1.72/1.50
& 1.94/1.50 |
115-175 |
76 CC Chambers
Intake flow 150.8 CFM
Exhaust flow 91.1 CFM |
| 333882 |
70-80 |
1.94/1.50 |
150-180 |
76CC Chambers
Intake flow 137.2 CFM
Exhaust flow 95.4 CFM |
| 462624 |
76-87 |
1.94/1.50
& 2.02/1.60 |
Not listed |
76 CC Chambers
These are crack prone! |
