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11-18-2011, 08:29:31 PM
I have these 14014416 casting number heads and was wondering what facts you guys could give me about them (I know they are 305 heads), and I would also like to know how well they would work out on a 350. Any help is greatly appreciated!

11-18-2011, 10:28:30 PM
58cc chambers, 1.84/1.50 valves stock. They work great on a 350 with a set of 1.94 valves installed.

11-18-2011, 10:30:05 PM
I know they've had some work done to them, and they have push rod guide plates, is this a stock feature?

11-19-2011, 12:21:49 AM
No, GM didn't give them screw-in studs nor pushrod guideplates. And they work just fine even without having them cut for the bigger valves, though the 1.94s can help. Just be sure the shop adds a 75 degree bowl cut, or flow can actually suffer.
If you have dished pistons, then you can keep the cam as mild as you like. If your 350 has flat-tops in it, then you'll need a more serious cam, or a lot of octane.
416s respond well to good porting, and even ported are not prone to cracking.

11-19-2011, 12:29:51 AM
Well, the heads in it now are causing a backfire that's why I'm putting in the 416's, but the rocker arms are moving quite a bit so I'm thinking there is already a pretty good sized cam in there. I'm not sure what pistons are in it, I guess I'll know when I take the heads off!

11-19-2011, 12:34:54 AM
Heads causing backfiring? Maybe if you have some damaged seats / valves. Backfiring may also be a problem with your ignition advance or cam timing.
Rockers moving may be cam / lifter(s) going bad, that would be a lubrication problem or too stiff springs ( or both ).
No throwing parts at it until you know all the causes of all the problems. Good diagnosis isn't often easy, but it's most important.

11-19-2011, 12:57:41 AM
Yes, it is a burnt valve...cam,timing,springs, and everything else turned out all right, and when I said the rocker arms were moving I meant the push rods were moving up and down pretty far not that the rocker arms themselves were actually moving on their own.

11-19-2011, 12:10:04 PM
Yoi can't tell how large of a cam you have by watching the rockers move

11-19-2011, 12:27:03 PM
Yoi can't tell how large of a cam you have by watching the rockers move.

I don't know anyone who can eyeball it with any accuracy but you can measure the movement and get a pretty close estimate of the cam lift.

11-19-2011, 12:56:31 PM
The 416s are kindof a little known junkyard secret... the ports actually flow quite well (for a production line GM head) - the same or better than most 350 heads. They are also a 'heavy' casting that is not prone to cracking or warping like the 'lightweight' castings. The chamber design is fairly good, similar to the old camel hump heads of the '60s, though with smaller chambers (58cc vs 64cc). Intake ports usually measure out around 165cc.

They work very well when upgraded from 1.84/1.50 valves to 1.94/1.50 valves - though its not generally recommended to go larger, especially on the intake, due to valve shrouding, because of the tiny chambers. Stay with 1.94/1.50 or maybe 1.60ex valve and you're golden.

This comes up from time to time on the 3rdgen boards, as most of their 305s came with these heads. There is a very good thread on porting these heads specifically at www.thirdgen.org by a guy names Sitting Bull.

11-19-2011, 03:49:42 PM
Over on earlythirdgen's forum, there's an old pro starting a thread on the best way for newbs to DIY port these. This guy is the real deal, a true professional. He goes by Atilla the Fun. What his real name is, nobody knows, he claims it's secret because of his health. Supposedly fighting cancer. Banned from TGO though JT himself admitted that this guy has the knowledge. Anyway, he had a thread on there that I looked at before starting my Vortecs, and from that, and my results posted here, it's easy to get amazing results with very little work, and Atilla makes it easy.

11-19-2011, 10:08:48 PM
Yeah, well I pulled the intake off today, will be pulling the 882's that are all ready on it tomorrow, I'll also be replacing the performer intake that's already on it for a Performer RPM, the 416's all ready have a full machining job done to them (ports, valves, etc.), And I know you can't get an exact number of the cam through eye-balling it, but you can get a general idea of what size the cam is.