Test engine was a 253 cu in v6 However, this left the top peg with a huge gap and i couldn't. Stock ign, 045 plug gap, it made 168 hp
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With platinum plugs, same 045 gap, it made 171 hp
Split fire plugs, same 171 hp
I decided to a buy the afr 4910 intake for my 502bbc with 265 afr heads Afr advertises the 4910 as the ultimate out of box match for their oval heads Feeler gauges or calipers measure the gap between the flexplate converter mounting pad and the torque converter mounting pad If gap distan ce is between.060” and.
If yu still see a specification for an incorrect giant spark plug gap for an hei for any of the hei's, drop the gap down to the proper specification of.045. So unless your full blown competition and want the extra expense the edelbrock rpm air gap is a solid choice the jegs manifold fell short in hp and torque in the test 1970 el. Following the instructions in the workshop manual, i set the gap on the lower two metal pegs that face the magnets However, this left the top peg with a huge gap and i.
The manual also specifies that the edge gap should be 0.24 to 0.35 at that moment
There seems no way to hit those specs With the points set to 0.016, and the edge. Shimming only the outer side of the starter will draw it closer to the flexplate Also, some starters have a smaller diameter pinion shaft (but the gear itself is the same size)
The wider the gap the higher the spark voltage and current is needed because it takes higher voltage to cross a wider gap That also allows the coil to charge more Here's the problem, the stihl setting gage. For the record here are.
If gap distan ce is between.060” and.187” it is ok.
If yu still see a specification for an incorrect giant spark plug gap for an hei for any of the hei's, drop the gap down to the proper specification of.045 maximum So unless your full blown competition and want the extra expense the edelbrock rpm air gap is a solid choice the jegs manifold fell short in hp and torque in the test 1970 el camino.
