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Nu-Tek uses splayed 4-bolt main caps for serious strength. For the splayed 4-bolts, they start with a 2-bolt block and drill the splayed bolt holes themselves, since the factory 4-bolts go straight in and so are not compatible. Nu-Tek has to fit these caps to the block because they are actually smaller than the mains in the block when received. "The number of main bolts used is a horsepower issue and a budget issue," Nick says. "I would be really reluctant to build a supercharged 396 with a 2-bolt cap. Though I won't refuse, anything outside of what I think is reasonable is gonna come with a disclaimer!" View Related Article
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