[Jim Robertson]

Four heads (part no. 77849) arrived a few days ago. We have been looking them over and measuring a few things:

The casting quality appears similar to other Edelbrock products - Excellent

The machining appears of very good quality and is consistent over these four heads with very nice surface finishes

I have not had a 12.6 degree head in my hand yet so I cannot provide any feedback on the similarities or differences.

Seats and guides were in a bag in the box.

Seat outside diameters were much larger than the opening in the head...and thus heads will require machining just to attempt installation of seats. Depth of intake pocket is shown on the pics.

Intake ports as cast at the intake flange are .832” x 1.605”

Exhaust port as cast at the flange are 1.478” x 1.10”

Spring seat diameter is 1.742”

Guide length in the head as cast is 2.100”

Straw is inserted into the oil return passage. Oil return passages are not straight through; some of the passage is drilled from the top and the intersecting passage is drilled at a different angle from the deck side to complete the path.

These bolted very nicely an a block that is here. Location of intake valve opening in relation to bore wall looks very promising.

Intake port outline is a quick scribe from a Butler wideport gasket. Note the outer bolt hole location and the water crossover location compared to the gasket. ???

To me these have great potential…but the bar has been placed very high already with the excellent crop of heads that are out. Time will tell if these are worth the extra effort.