The 64cc heads will work fine but if you want to run it on the street on pump gas then use the dish pistons to keep the compression down.
Here is my 409 (400sb +.040) build with 12.7 to 1 compression.
Block
3951511 400 70-80 255-265hp Car & Truck 4-Bolt Main 3-freeze plugs
Heads
3927186 302/327/350 68-72 1.94/1.50 2.02/1.60 64cc Doubble humps Bolt holes
Intake
3872783 283/327 66-67 4-Brl Holley
Crank
3951529 400 70-80 2.65/2.10 3.75 Nodular Iron?
With
850 Holley Double Pumper
and
Flat top pistons with 6cc valve reliefs.
I raced this engine with a NOS(125) in a mud truck for two years without any problems but it does need higher octane fuel than you can get at the local gas pump. :thumbup:
These holes are easily drilled into heads that don't have them and just use the 400 head gasket to find where the holes are needed. :thumbup:
I drilled the holes in my 3927186 heads and have not had any problems with them.
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