Opinions on GM 87 350 swirl port heads

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Ron Miller
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Opinions on GM 87 350 swirl port heads

Post by Ron Miller » Tue May 15, 2018 1:51 pm

Looking for Opinions on GM 87 350 swirl port heads casting number 14102191. I have a New pair Nos bare castings that will need to be shot blasted, been sitting a while. Would it be worth my time to do a fresh valve job, install new stainless valves, etc? I have no use for them, just looking to resell when done. If this post is out of the text, Please move.

Thanks for looking,
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Re: Opinions on GM 87 350 swirl port heads

Post by Carnut1 » Tue May 15, 2018 3:20 pm

Ron Miller wrote:
Tue May 15, 2018 1:51 pm
Looking for Opinions on GM 87 350 swirl port heads casting number 14102191. I have a New pair Nos bare castings that will need to be shot blasted, been sitting a while. Would it be worth my time to do a fresh valve job, install new stainless valves, etc? I have no use for them, just looking to resell when done. If this post is out of the text, Please move.

Thanks for looking,
Depends on application
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Re: Opinions on GM 87 350 swirl port heads

Post by Ericnova » Tue May 15, 2018 4:38 pm

Not worth the cost of the parts and the labor when done, so why bother??

Best use is a door stop or on the end of a anchor rope(not anchor chain so you can just cut it and leave it down there) :mrgreen:

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Re: Opinions on GM 87 350 swirl port heads

Post by cuisinartvette » Tue May 15, 2018 5:04 pm

x2 on selling as is now, not worth what youll have in them. Not much of a market for stock iron heads unless they are a killer deal for someone.
Last edited by cuisinartvette on Tue May 15, 2018 5:35 pm, edited 1 time in total.

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Re: Opinions on GM 87 350 swirl port heads

Post by fastredgmc » Tue May 15, 2018 5:33 pm

Just paid 250 for a complete pair of those with valve covers and rockers. They were new take offs of a gm crate motor the guy had bought, never ran. I just got them to put on engine for truck im restoring. mainly got them for the nice powder coat :lol: ......hope it gives u an idea what they are worth

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Re: Opinions on GM 87 350 swirl port heads

Post by Carnut1 » Tue May 15, 2018 5:39 pm

I love how these heads get a bad rap.
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Re: Opinions on GM 87 350 swirl port heads

Post by Ron Miller » Tue May 15, 2018 5:58 pm

Thanks to all that replied. The heads were free. I was going to buy a stainless valve & spring kit for $ 100.00 and the cost to blast them. Then my time for the valve job. This is going to be a stocker head with No porting or extra work.

Thanks Again, =D>
Ron Miller

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Re: Opinions on GM 87 350 swirl port heads

Post by B Original » Tue May 15, 2018 8:30 pm

I used to have a really low opinion of these head but when you put them in the context of what they were designed for they're great heads to make torque below 4000 RPM so plan on building the engine for a low RPM high torque. If you're going to try to make horsepower above 5000 RPM you need to look into I different cylinder head

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Re: Opinions on GM 87 350 swirl port heads

Post by novadude » Tue May 15, 2018 9:49 pm

Carnut1 wrote:
Tue May 15, 2018 5:39 pm
I love how these heads get a bad rap.
Tell me more. It's always fun to hear about how to make factory "junk" run....

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Re: Opinions on GM 87 350 swirl port heads

Post by Carnut1 » Tue May 15, 2018 10:18 pm

novadude wrote:
Tue May 15, 2018 9:49 pm
Carnut1 wrote:
Tue May 15, 2018 5:39 pm
I love how these heads get a bad rap.
Tell me more. It's always fun to hear about how to make factory "junk" run....
I have only done a few sets, my favorite set was cut for 2.055/1.6 valves, fully ported, studs and guide plates, cut for roller springs, ceramic coated valves and chambers.
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Re: Opinions on GM 87 350 swirl port heads

Post by Carnut1 » Tue May 15, 2018 10:22 pm

Screenshot_2016-12-23-05-09-02_2.png
Picture of a picture. This is them early 90's 383, hydraulic roller, tbi work truck engine.
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Re: Opinions on GM 87 350 swirl port heads

Post by BOOT » Wed May 16, 2018 11:39 am

I guess the question is will they rust up again before they sell?
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Re: Opinions on GM 87 350 swirl port heads

Post by CGT » Wed May 16, 2018 11:51 am

I like those heads, but not for the obvious reason. I think the swirl ports along with 305 heads helped inspire GM's knock sensor development program. :D

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Re: Opinions on GM 87 350 swirl port heads

Post by Carnut1 » Wed May 16, 2018 11:57 am

CGT wrote:
Wed May 16, 2018 11:51 am
I like those heads, but not for the obvious reason. I think the swirl ports along with 305 heads helped inspire GM's knock sensor development program. :D
That is funny. These heads require a much different spark curve and less total timing vs. conventional port. Thanks, Charlie
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Re: Opinions on GM 87 350 swirl port heads

Post by novadude » Wed May 16, 2018 10:46 pm

I've heard that these heads like ~25 deg total timing, which is really, really low compared to the junk chamber in the '882', '624', etc heads that preceded them in the SBC development timeline. Have you all found the same?

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