Stock Head Question

[Air_Adam]

416 are great budget performance heads. Very similar to the old double hump heads, just with smaller chambers. Its easy to have 1.94/1.60 valves installed. They make right around 10.5:1 or so with a flat top piston and a typical rebuilder head gasket. They are spec'd at 58cc, but most usually come out around 60-62cc.

The 081 and 083 TPI heads are really good too.... they are the same, but the 081 is a 58cc chamber with 1.84/1.50 valves, the 083 is 64cc with 1.94/1.50 valves.

 

[hhott71]

Skimp on heads, skimp on power.
Good head is worth 30-100 HP

 

[RacerRick]

416's are about 155-160cc intake ports, and are spec'd at 58cc chambers. Good heads, but all aftermarket heads are better.

 

[BondoSpecial]

The problem with the "it's easy to put 1.94/1.6 valves into 416 heads" mentality, is that doing this operation, plus a valve job, will easily cost $500 at a competent machine shop, plus the cost of new valves. There goes your budget. 416s in stock small valve configuration, on a mild engine , will run okay. Not great but better than a lot of smog heads.

 

[Air_Adam]

416's are about 155-160cc intake ports, and are spec'd at 58cc chambers. Good heads, but all aftermarket heads are better.

Of course... I changed from 882s to 601 (similar to 416, little different and smaller chamber) and was very happy with the upgrade... then changed to 200cc aftermarket heads and was even more impressed.

The 416 and 601 still make a fantastic upgrade from the weakling 882 or 624 heads, as long as the valve size is upgraded to work well with a 350 (1.94/1.50 minimum).

 

[RacerRick]

If you have a set of 416 or 601 casting heads with 1.84" intake valves - leave them and run the heads!

1.94" intake valves show no power improvement at all because of the shrouding due to the small chamber - especially on 601 casting heads with their 53cc chamber. You have to unshroud the larger valves in the chamber to make them flow, and you have to know where you can do it or you will run the risk of cracking the heads.

 

[sooner]

416 flow numbers are right there with the aluminum l98 corvette heads that gm still puts on the zz4 crate motors. these heads respond well to pocket porting (if interested) even while reusing the stock valves.

 

[pdq67]

I've posted this before so here goes again!

IMHO, the old 305HO, -601 head is a dandy head for dished pistoned 350's and the smaller, flat-top pistoned engines like the 265, 283 and 307..

They have anywhere from 52 to I figure 58 cc double quench chambers that are very much like the original fuelie head, the old -461! And up until later heads like the -601 came out, the -461's were the ONLY double-quench, "closed-chambered", SB heads there were that are stock.

(NOTE!! You have to cc them to know how small they are for sure here!!)...

Along w/ 160 cc intake ports and 1.84"/1.50" valves and hardened seats!

I would just install 1.60" exhaust valves in them and go and I have a set out in the garage that I cc'd at 53 and 55 cc's w/ 160.0 and 160.+ intake ports!

pdq67

PS., oh, and I would pin the studs and if I was to run 1.6 ratio rockers slot the p/r slots longer and if I use them on my next junk292 engine I will. Otherwise, if I go junk301/306 b/c of piston availability, I will use my good big valve -291's and do the same thing to them along w/ domed pistons of old...

 

[Simon@London]

Hey PDQ67 is there any difference in the heads with different casting numbers.

My 70 motor I found out has #920 heads, they are the same as 882's right.

 

[Air_Adam]

Hey PDQ67 is there any difference in the heads with different casting numbers.

My 70 motor I found out has #920 heads, they are the same as 882's right.

882 and 624 are the weak, crack prone "lightweight" castings IIRC. Almost any other casting is better than those two.