New bb build fuel economy

plymouth1937 said

Thinking about building me a 400bb whid 440 crank,ending up whid 451 cui,the direction whid this build is fuel economi not performance,as this engine orignaly is a low comp engine im shooting for 9.5 ratio,any sugestions on cam pistones intake carb,this is a low budget build so cast crank cast pistons and so on,what heads are the most efficent,cast stock heads,valve angles,mild porting.....

Click to expand...

if you're set on using a cast crank you need to think about line boring the mains on the block to the 440 crank journals.
if you use a set of rods at 6.76" (440 rods) then you can use a pretty common 1.32" compression height piston, made by many places. SRP, 440 Source, Ross, Wiseco, Icon. none are cast pistons though.
I would build for quench and use a closed chamber head like a factory 915 casting, or 440source heads.
quench would mean, you put the flat top piston close to zero deck and use something like a .039" gasket thickness with a closed chamber head.