Bowtie Phase III 64cc Angle plug 184 cc intake runner. SB2.2 head 48 ~ 54 CC angle plug 284 CC intake runner Bare heads. It contains an exhaust gas heat riser and offers excellent performance potential.12480011. This manifold has a balanced 180° firing order port runner arrangement. What was the difference in the pistons to cause that. Larger Dave E emperor91108 Registered Joined 278 Posts #8 The casting numbers check out … read more.The 327/350 horse used a hotter flat tappet hydraulic cam and the 327/365-375 horse engine used the same flat tappet solid cam as the 302/290 horse engine. I was told the engine is a 327, with 300/350 Hp heads. I just bought a 63 Corvette, with a 64rebuilt engine. Weight: Aluminum heads weigh about 45 to 50 lbs., a pair, less than iron heads.63 Corvette: the engine is a 327, with 300/350 Hp heads.casting. In some cases the engine would have produced more power with a set of well ported, iron heads, and at a lower price. They are under a deadline and the rent has to be paid so the facts sometimes take a back seat. The 327 has excellent potential for power as many guys have proven, but you have to rev it higher to get there. All else being equal, the 350 will have more seat of the pants torque for a street car. Your crate 350, if it's still relatively new, probably has more potential for what you want out of it. GM would continue offering the 350ci V8 for fitment into production models. GM offered this engine in two different formats, for the Corvette during the 1969 model year, a 300 HP version, and a larger 350 HP variant.
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