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Professional Products Part # 52003
Description:
RPM Range-Idle to 5500
This manifold is based on our most popular manifold, the Performance Street #52000/52001. It is designed to fit engine swaps using the 1996 and later Vortec (Gen 1+) cast iron heads or the Edelbrock E-Tec aluminum heads. These cylinder heads are very popular in street rods, engine swaps, or the industrial market. This manifold can be used on any Chevy V-8 engine utilizing the late Vortec head. This manifold has provision for external water bypass. It also features four corner water outlets, dual distributor holddowns, includes a square bore carb adapter and gasket, and will work with a late model style water neck, alternator, HEI and air conditioning brackets. Will also fit 1996 and later Vortec engines with some minor modifications. The modification is not to the manifold itself. It just requires running a short section of heater hose from the pipe tapped hole in the front of the manifold to the 5/8" hose nipple on passenger's side of the water pump. The 1966 and later Vortec blocks do not have a water bypass in the block and this hose takes care of that issue.
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Manifold Technical Data
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Note: Dimension "A" is measured from bottom machined surface of manifold to the highest portion of the carburetor flange or plenum housing.
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Manifold Part No.
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Dim. A
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Dim. B
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Dim. C
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Fel-Pro Gasket
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52000/52001
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4.05
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1.19
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1.90
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#1204 or #1256
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52006/52007
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4.25
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1.18**
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2.06
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#1255
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52008/52009
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4.05
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1.19
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1.90
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#1204 or #1256
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52020/52021
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4.65
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1.24
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2.05
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#1205
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52025/52026
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4.65
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1.24
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2.05
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#1205
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52027/52028
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4.65
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1.18**
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2.06
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#1255
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52030/52031
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6.06
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1.11*
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1.80*
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#1205 or #1206
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52032/52033
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6.06
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1.18**
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2.06
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#1255
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53000/53001
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4.85
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1.82
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2.05
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#1210 or #1212
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53030/53031
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6.16
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1.69
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2.31
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#1211 or #1275
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53034/53035
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6.19
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1.69
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2.31
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#1211 or #1275
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53036/53037
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6.49
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1.69
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2.31
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#1211 or #1275
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54000/54001
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4.12
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1.06
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1.87
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#1250
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54020/54021
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11.05
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1.06
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1.87
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#1250
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54025/54026
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4.12
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1.06
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1.87
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#1250
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54126/54127
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5.62
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1.06
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1.87
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#1250
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55025/55026
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5.50
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1.08
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2.16
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#1213
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* The ports on the 52030 and 52031 are purposely left smaller to allow a wide range of porting to match various head port configurations. However, the port runners themselves are much larger than the actual port opening.
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** Measured at the widest area of port.
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Note: 53000/53001 big block Chevy has oval ports, 52006/52007 Vortec has tapered ports. All others are rectangular.
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