sounds like going to the 87cc is required to do that. i asked about doing the heart shape chambers with a 315cfm porting to my new 72cc heads & he said he doesnt do the heart shape anymore on the 72cc heads, no mention of opening to 87cc to do it but maybe that was overlooked or probably my misunderstanding. heres a copy of his reply to me asking if he does that service still.
from feb/2021: "I no longer offer the heart shaped chamber option for the cast 72cc heads. Not enough demand and too time consuming to deal with and 95% of my customers are looking for larger chambers also Edelbrock has their own 72cc heart shaped chamber head now."
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