I have a set of 882 and a set of 416 heads to go on a 350. Which heads should I use: the smaller chamber and smaller valve 416 ported and polished or port the 882 and have them decked to decrease chamber size and port and polish them.

 

I have an Excel chart with a lot of flow data, if interested post emil address and I will send it to you, however you must have Mircosoft Excel Spreadsheet capabilities.

 

Here is some data, but the spread sheet is much better:

CASTING
INTAKE RUNNER
CHAMBER VOLUME
VALVE SIZING
MATERIAL

882
151
76
1.94/1.50
IRON

441
155
76
1.94/1.50
IRON

462
156
62
1.94/1.50
IRON

GM L-98
163
58
1.94/1.50
ALUMINUM

EDELBROCK PERFORMER
166
70
2.02/1.60
ALUMINUM

GM VORTEC
170
64
1.94/1.50
IRON

GM LT-1
170
58
1.94/1.50
ALUMINUM

WORLD S/R TORQUER
170
67
2.02/1.60
IRON

DART IRON EAGLE 165 S/S
165
72
1.94/1.50
IRON

EDELBROCK PERFORMER RPM
170
71
2.02/1.60
ALUMINUM

DART IRON EAGLE 180
174
68
2.02/1.60
IRON

 

If that spreadsheet has the 186 castings, ill take it

Stekman@attbi.com

if it doesnt, ill take it anyway

i know F-BIRD'88 and company have had lots of success with the 416 castings (at least i think it was the 416 casting).....do a search, theres lots of good info on the 416 head

 

The 416s will flow better, will give you more compression, and will be less likely to crack.

Throw the 882s in the garbage, where they belong.

 

Anthing besides 882s!!! lol

 

The common published flow specs for 882's are not a stock head as supplied from GM.
And they sure don't perform like that.

In stock form, with the stock valves the 882's flow slightly more than stock 416's,,,but......

In ported form with larger valves the 416 heads come out much better. More flow, better chamber...

You can tweek the chamber size up on the 416's to suite your 350. ( deshrouding) and pick up flow too.

You'll never get the chamber size down near enough on an 882 without $$angle milling$$.

I've had both. The modded 416's are better.

Don't forget the larger valves.