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Buy adding .100 to the deck surface you allow the entire intakeĀ Ā seat to be enclosed by the aluminum material, also allowing the use of "hoops" or fire rings instead of o-rings.
Note on Intake manifolds : when you add .100 inches to your intake and then put it on a standard deck block, you can simple use a intake manifold for a tall block.For BAE ( or Venny or JFR) fuel thick heads(+.100) they did not add material to the intake side, the idea was most teams at the time already had +.100 blocks and lots of +.100 intakes so as the used up the blocks and std heads the +.100" of material simply showed up on new heads (and new blocks were ordered - std) and they didn't need to by new intakes, this then flooded the used market with tall (+.100) blocks.And now when you got a good deal on tall blocks and found a good deal on tall heads you actually need a "+.200" manifold that does not exist.
Your options for a tall bocks areĀ :
1) cut .100 inches off of the block ----and the registers were the sleeves sit also have to go down .100" ( this is the hard part, but can be done by a machine shop )
2) sell or trade for AJPE thick (+.100) heads these are basically the same but Allan Johnson added the material to the intake side to compensate for the extra height, so when you use AJPE Ā (+.100) heads to a stock height block you use a std intake or when you use his heads on a (+.100) block you use a (+.100) manifold ( with this you do have to add spacers on the manifold ends). Note: There is still exceptions to this.
These chambers are usually designed forĀ 4.187 boreĀ diameters andĀ holdĀ 200+ccĀ volume
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