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1 19th January 20:32
d.l. man
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Default How can you tell the difference between a 350 head and 305?


I just pulled the heads on my dads 350 blazer and I was wondering if the new
heads are off a 305. The bolts for the rocker arms don't thread down as far
as the old ones. And there is allot of play for the valves. I don't think
that it will fit. Is this the same kind of head or what?
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2 19th January 20:32
\doc\
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Default How can you tell the difference between a 350 head and 305?


What is the casting number stamped where the rockers are located? I'll give
ya the specs on them thar' heads...........

Doc
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3 19th January 20:32
d.l. man
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Default How can you tell the difference between a 350 head and 305?


It is hard to read but I think that it says 8888882 and right next to it k12
on the other side it has what appears to be 21 or 12 and there is a bunch of
number further down towards the firewall that I can't read.

Used parts **** sometimes.
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4 19th January 20:32
snoman
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Default How can you tell the difference between a 350 head and 305?


305 and 350 heads are the same except for combustion chamber size. My
guess on the stud thread length may be the difference for head that
were on a engine with factory rolled lifters or not as chevy switch
them over to this style lifter some time ago the the lifter is
longer/taller than a flat bottomed hyd one.

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5 19th January 20:32
d.l. man
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Default How can you tell the difference between a 350 head and 305?


I checked the lifters off the new head and they are the same size as the old
ones the push rods seem to be the same size too. And I know that they were
on the lobes when I put the intake on. they seemed to fit the old engine but
not my dads.
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6 19th January 20:33
\doc\
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Default How can you tell the difference between a 350 head and 305?


That ain't the cylinder head casting number dude. Doc
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7 19th January 20:33
d.l. man
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Default How can you tell the difference between a 350 head and 305?


I looked between the rocker arms and there were those numbers. Maybe I am
looking in the wrong spot. Can you tell me where I might find them.
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8 19th January 20:33
kenner costen
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Default How can you tell the difference between a 350 head and 305?


350 and 305 and 327 and 307 heads are relatively the same head except for
combustion size and valve size. If chamber size and valve match, run them.
Does not matter unless you go into vortec or roller heads. Also on engine
notorious for lower compressions, 307 and 305 you will find larger chambers,
which does not hurt with today's fuel.
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9 19th January 20:33
jeremy stec
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Default How can you tell the difference between a 350 head and 305?


I bet the number is 333882. See the following:
SMALL BLOCK CHEVY HEAD CASTING NUMBERS


Casting Number CID Year Application Comments

330545 307, 350 73 Pass, Camaro, Chevelle, Nova All, Medium Perf
333882 350, 400 73-76 Pass
333882 350 74-76 Camaro, Z28 All w/o Steam Holes
333882 400 74-76 Chevelle, Monte Carlo w/ Steam Holes
333882 350 74-79 Truck Light Duty, w/o Steam Holes
333882 400 75-79 Blazer 4X4 Models, w/ Steam Holes
333882 400 76-80 Truck Light Duty, w/Steam Holes
340292 350 MID 70's Replacement Over the counter Hi-Perf Turbo Head
354434 262 75-76 Monza, Nova Light Castings
354434 305 76-79 Truck Light Duty, Light Castings
354434 305 76-85 Pass, Camaro Light Duty, Light Castings
358741 305 76-79
367450 262 75-76 Monza, Nova
376445 350 77-85 Truck Heavy Duty
462624 350 71-79 Camaro, Corvette Hi-Perf, Extra Manifold Bolt Hole
462624 400 75-80 Truck Light Duty, Extra Manifold Bolt Hole
462624 350 75-86 Truck Light Duty, Extra Manifold Bolt Hole
462624 350 80-85 Truck Heavy Duty, Extra Manifold Bolt Hole
462624 350 80-85 Corvette All, Extra Manifold Bolt Hole
468642 350 71-79 Truck Heavy Duty, Small Plugs
468642 400 75-80 Truck Light Duty, Small Plugs
468642 350 75-85 Truck Light Duty, Small Plugs
468642 350 80-85 Covette Small Plugs
468642 350 80-85 Truck Heavy Duty
517513 267 79-82 Pass, Malibu, Monte Carlo
3703523 265 55 Corvette 195 HP
3703523 265 55 Pass 4 BC
3725306 265 56 Corvette 2 Bolt Exhaust Manifold, 210 HP
375306 265 56 Pass 4 BC
3725306 265 Early 56 Corvette 2 Bolt Exhaust Manifols, 225 HP
3731539 283 57 Pass 4 BC & Fuel Injection
3731539 383 57 Corvette 283 HP Fuel Injection
3731539 283 57 Truck
3731554 283 57 Pass 2 BC
3731762 265 56 Pass 2X4 BC
3731762 265 56 Corvette 3 Bolt Exhaust Manifold, 240 HP
3731762 265 Late 65 Corvette 3 Bolt Exhaust Manifold, 255 HP
3740997 283 57 Pass 2X4 BC, 250 HP, Fuel Injection


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10 19th January 20:34
d.l. man
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Default How can you tell the difference between a 350 head and 305?


Thanks for typing all that out. I hope it wasn't to much trouble?

So then going by what you wrote here for me. The 333882 is only for 350 and
up? It couldn't go on the 305, it has to be 350. When I compared the 2
heads together while it was off I had them side by side and nothing really
stuck out like the valves being different sizes so unless they are really
similar to the ***** eye they should be the same.
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