Quote:
Originally Posted by andyh1956
i think to make the 230-250 head breathe better you cut out the "tunnel" the center head bolt goes through & use a stud & nut in the intake port. the dirt trackers around here about 20 years ago were taking two small block heads & cutting the end cyl off & welding them together. they bolt on & that gives you a crossflow head. don't remember where they got the manifold or if they made it. been away from that stuff for a long time.
andy
p.s. a 235 will fit where the 216 is in your '52. and where a 235 fits a 261 will too!
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Andy, just removing the intake port head bolt boss, or even reshaping it, has been proven to not have significant effect. What is proven is to remove it (and this can be done with hand tools) and adding "lumps" in the ports. Search Youtube for "lump ports", Tom has a good video on there. Lump kits are about $100. Cheap horsepower.
Yes, you can take 2 aluminum SBC heads, cut off a cylinder, and reweld to make a "Hybrid" head. The racers have done this for years, but it is not cheap or easy. Again, see Santucci's book on Chevy Inline Performance.
Too bad chevy never made a cross flow head. That head is what holds those engines back from being really spectacular.