|
 |
Performer Pontiac (With D-Port Exhaust)
Performer Pontiac heads utilize a D-Port exhaust port configuration for use with standard D-port exhaust systems. They are designed for 1962-79 389, 400, 421, 428 and 455 cid V8 Pontiac engines with a 4.060" or larger bore. They feature optimized oil return passages for increased oil flow. These heads are available in three heart shaped combustion chamber sizes, including 65cc, 72cc and 87cc. The 65cc combustion
chambers are as-cast while the 72cc and 87cc chambers are fully CNC'd to provide a 9.5:1 compression ratio when used with flat-top pistons. The spark plug has been relocated closer to the exhaust valve for improved
performance. These heads are cast with extra thick port walls and a compact port size, making them ideal for CNC and hand porting. Complete heads include guide plates, rocker studs and high quality valvetrain for direct bolt-on application. Heat crossover is machined for 50-state emissions legal performance.
Cylinder Head Specifications |
| Combustion chamber volume |
(A) 65cc / 72cc / 87cc |
| Intake runner volume |
204cc |
| Exhaust runner volume |
145cc |
| Intake valve diameter |
2.11" |
| Exhaust valve diameter |
1.66" |
| Valve stem diameter |
11/32" |
| Valve guides |
Manganese bronze |
| Deck thickness |
5/8" |
| Valve spring diameter |
1.46"; 120lbs. @ 1.800" Inst. Height |
| Valve spring maximum lift |
.550"; 1.150" Coil Bind |
| Rocker stud |
7/16" |
| Guideplate |
Hardended steel |
| Pushrod diameter |
5/16" |
| Valve angle |
14° |
| Exhaust port location |
D-Port (Stock Location) |
| Spark plug fitment |
14mm x 3/4 reach, gasket seat |
| Made In |
USA |
|
|
Technical Notes: 350 c.i.d. engines may require notching the block for valve clearance. Three head bolt bosses are raised higher than the standard D-port heights and will require head bolt kit #8561 to install these heads.
(A) Available BARE ONLY. |
| |
| Description |
Bare (Single) |
Complete (Single) |
| Performer (65cc) |
61539 |
N/A |
| Performer (72cc) (with springs for hydraulic flat tappet cams) |
61589 |
61599 |
| Performer (72cc) (with springs for hydraulic roller cams) |
61589 |
61595 |
| Performer (87cc) (with springs for hydraulic flat tappet cams) |
61569 |
61579 |
| Performer (87cc) (with springs for hydraulic roller cams) |
61569 |
61575 |
| Pontiac Head Bolt Kit |
N/A |
8561 |
|
Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O (4.15" Bore)
| #61589 |
| Valve Lift |
.100" |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
| Intake |
65 |
136 |
199 |
237 |
255 |
262 |
263 |
| Exhaust |
52 |
103 |
130 |
145 |
151 |
157 |
159 |
|
| |
Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O (4.15" Bore)
| #61569 |
| Valve Lift |
.100" |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
| Intake |
64 |
139 |
200 |
235 |
249 |
256 |
258 |
| Exhaust |
52 |
104 |
131 |
145 |
151 |
156 |
157 |
|
| * Springs Rated to .550" lift |
| |
Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O (4.15" Bore)
| #61569 ( D-PORT 87cc Chamber) |
| Valve Lift |
.100" |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
| Intake |
64 |
139 |
200 |
237 |
251 |
262 |
266 |
| Exhaust |
53 |
99 |
131 |
151 |
160 |
165 |
167 |
|
AMC
