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75GMCman 11-13-2008 06:50 PM

Stock 350 heads
What is the intake runner and combustion chamber on stock 350 heads? I've tried looking but I can't anything.

Thanks Caleb.

bondo 11-14-2008 05:16 AM


Without a Casting #,.. That question is Unanswerable....

There have been Many Different "Stock 350 heads"...

oldironmike 11-14-2008 07:55 AM

76,68,64cc are probably the most common. average intake runner I think is around 170cc. I think you can get 185cc ported but that's stretching it.
The casting number will help give you an indicator but it's nothing positive with what you exactly have.
You will need to cc it yourself to be sure. Several rebuilds of the heads can make 76cc heads to 74's etc.


75GMCman 11-14-2008 08:28 AM

The casting number is 39988991.

F-BIRD'88 11-14-2008 10:48 AM

3998991....72-73...307/350......75cc chambers
small valves small ports low compression low perf
151 to 157 intake port volume. Very limited high perf potential.

If you are looking for a cheap SBC cylinder head for a budget buildup to make more
power, find some 305HO heads, home port them and install larger 1.94x1.60" valves. Just the ticket for a low budget 350 hi-perf build with flat top pistons.
Now you'll have the compression and port flow to support a high perf cam and make some power.
eg: 14014416...80-86...305..........1.84"/1.5" valves, 58cc chambers

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