StockHeads: EdelbrockHeads:
5,400 253 261 280 287
5,500 259 271 297 311
5,600 298 318 321 345
5,700 318 345 355 385
5,800 336 371 388 428
5,900 350 390 390 436
6,000 332 386 385 438
6,100 372 431

How To Swap Buick Heads
The father-son team of Dan and Chris White at White Racing go throughan exhaustive checklist when installing a set of Buick cylinder heads.Here are the majority of the steps they perform:

* Check for debris, and machine away burrs or casting flash
* Inspect for and fix any rough casting transitions in ports (the Edelbrock heads are CNC-machine port matched, so this was already done on the Performer RPM heads)
* Clean parts thoroughly with lacquer thinner and clean rag
* Check installation clearances
* Install checking valvesprings on one intake and exhaust valve
* Measure valvespring rate for valve-closed and max-open height
* Measure chamber volume to determine static combustion ratio
* Mock assembled cylinder head on block with head gasket and two head fasteners
* Measure valve-to-piston clearance
* Rotate crankshaft until piston is at 5 degrees after TDC
* Push down on valve until it touches piston head. Measure retainer height from the base of the valvespring seat (ex: 1.020 inch)
* Let the valve sit in its closed position and measure the height of the retainer (ex: 1.900 inch)
* Determine maximum intake valve lift by multiplying the intake lobe lift height (on your cam card) by the rocker ratio (0.312 inch x 1.6 = 0.499 inches of lift)
* Make sure there is at least 0.030 inches of retainer-to-valve seal clearance at this height
* Subtract the max valve-lift number (ex: .499 inch) from the closed valve height (ex: 1.900 - 0.499 = 1.401 inch) to get the max lift height
* Now subtract the valve-to-piston touch height from the max valve lift height to determine if you have enough clearance
* The difference in the max lift and piston-to-valve contact height should be at least 0.090 inch. If it isn't, pistons with valve reliefs will need to be installed in the engine, or the valve lift needs to be reduced.
* For the exhaust valve, rotate the crankshaft to position the piston 10 degrees before TDC and repeat the test on the exhaust valve using the process described above for the intake valve
* Install pushrods/rockers/adjuster nuts to check that the pushrod has clearance in the head's pushrod hole
* Check valvetrain geometry (that the rocker tip stays on the center of the valve tip)
* Determine the ideal pushrod length, and recheck pushrod clearance to the head
* Check that the rocker has clearance around the valvespring retainer
* Mock up the exhaust and intake manifolds with the gaskets to make sure they fit
* Install the valvecover with a gasket to check the clearance between the valvecover and the rockers
* Remove the head from engine, and inspect the block to determine the vintage

* '69 and earlier Buick blocks had an oil passage near the front that will need to be plugged with a 0.350-inch-diameter aluminum plug when using the Edelbrock heads
* Remove the rockers and checking valvesprings, and install the Edelbrock valvesprings, retainers, and locks
* Inspect the existing valvetrain (camshaft lobes, distributor drive, lifters)
* Install the head gasket with it covering the coolant holes (it can be installed two ways)
* Make sure studs or fasteners screw into the block hand tight, then apply thread sealer on the threads and final install
* Install the head on the block, and install fasteners
* Torque down the head fasteners in radial sequence from the center outward, making three or four passes until the top row of bolts are torqued to 110 lb-ft, and the bottom row to 110 lb-ft
* Install the pushrods with a dab of engine assembly lube on the tips
* Install the rockers with some engine assembly lube on the cup of the rocker
* Disassemble the rocker lock nuts/Allen screws, wipe some Moly on the threads, and reassemble
* Hand thread the rocker lock nuts on the rocker studs
* Starting at the number one cylinder, set the valvetrain preload on each valve
* Drain the old oil out of the engine
* Add some new engine oil, pour it over the lifters, cam, rockers, pushrods, and valves when adding (add an engine oil supplement for starting a brand-new engine)
* Install the exhaust gaskets and headers
* Using an engine oil pump pre-oiler, spin the oil pump until the engine has oil pressure
* Rotate the crank in 90 degree increments for 720 degrees until you see oil at all 16 rockers
* Install the intake manifold with gaskets and sealer
* Install the remaining engine components until the engine is assembled
* Install the distributor set at 30 degrees static advance (set engine at 30 BTDC and set the distributor in place with the rotor pointing at the number one cylinder post)
* Fill the coolant system with a 50/50 coolant/water mix
* Leave the radiator cap off for startup to top off the coolant system before it gets hot
* Start the engine, bring it to 3,000 rpm, top off the cooling system, and install the radiator cap
* Set the timing using a timing light to 30 degrees BTDC with the engine running
* Shut off when the engine is up to temperature

COMP Cams Edelbrock
Dept. 5.0
2700 California St.
CA  90503
White Racing And Marine