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Old 10-15-2007, 05:23 PM
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416 sbc heads

Does anybody know how many ccs' a 305 casting# 416 is supposed to have? I have a set I may use. I've read some 305 heads only have (roughly) 54cc combustion chambers, which would have to be the smallest stock chevy chamber I've heard of.

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Old 10-15-2007, 07:21 PM
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Quote:
Originally Posted by brandon624
Does anybody know how many ccs' a 305 casting# 416 is supposed to have? I have a set I may use. I've read some 305 heads only have (roughly) 54cc combustion chambers, which would have to be the smallest stock chevy chamber I've heard of.
58cc is advertised, they're probably a little bigger like all you measure.

Why a 416, while good enough for a 305, they're under valved and undersized for anything bigger. Modified with larger valves and ported just short of hitting water they were a rage several decades back before Mr. Ricardo's' head studies were rediscovered in the mid 1980s. Rebuilding these 305 heads is fairly expensive and the result won't hold a candle to a set of Vortecs. So you need a really good reason to go down that road.

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Old 10-15-2007, 08:02 PM
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416 casting on a stock dished piston 350 makes for a lowend monster.Those heads bump the compression up to over 9.5:1 and those small ports and valves make it responsive in the lows.Fun for quick blasts. The motor I had like that only made power to like 4800rpms with a 214/224@050 cam but it was snappy.
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Old 10-16-2007, 02:48 AM
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Right now I have a 307 with a set of powerpack(58cc) 896 castings, that I have ported and parallel milled .090" off of. I also port matched and milled a cast iron intake to fit. This made a VERY NOTICEABLE difference in performance, and I really liked the higher compression. I was considering using the 305s, but for my new project I can only mill about .030" off, and I don't want my compression to drop too much.

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Old 10-16-2007, 02:54 PM
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The 416's are nomimally 58cc but typically 56 to 60cc. I have flat milled them to 52cc. That is about the limit as the spark plug boss is close to the deck on these heads. You'll have to cc your heads to see what size the chamber is now.
can be as big as 64cc.

Some of the 601 castings were 53cc. probabily from a 267ci motor.
All these heads in stock form are pretty lame. The power they make is limited. But can be modified with lots of porting and larger valves to work pretty good.
They have about the same potential as your power pack heads. the only real advantage is the accessory bolt holes for a post 69 alternator and PS mounting bracket.

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Old 10-17-2007, 02:05 PM
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Thanks for the reply. 601s eh'. I may look for set. I like ford 289 chambers, those are some serious compression makers.
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