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Old 09-09-2005, 08:47 PM
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I need head info

I came into a pair of GM heads #14102193. Supposed to be from mid 80's camaro. Anyone have any info on these like chamber cc on these and are they what they are supposed to be.
Thanks

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Old 09-09-2005, 08:56 PM
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there center bolt heads...huh? they came out in '87 for 305/350's 1.94 & 1.50 exh

not sure about the cc someone else in here will be a better help at that than me

J
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Old 09-10-2005, 01:28 AM
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Chamber Size

They Are More Likely 305 Heads And They Are 58cc Chambers
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Old 09-10-2005, 10:20 AM
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compreeion

Help? I've been in this thing for over an hour.
I have a .060 over 350, lunati 00016 cam, flat top four eyed piston, 72 cc heads with 1.6 rockers. My question is, what thickness head gasket do I use for a compression ratio of 9.0 to 9.5 to 1 with this set up? Thanks
P.S. stock (chevy) alum intake with afb carb.
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Old 09-10-2005, 10:27 AM
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http://kb-silvolite.com/calc.php?action=comp
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Old 09-10-2005, 10:28 AM
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this will answer alot of questions. post if it helps.http://kb-silvolite.com/calc.php?action=comp
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Old 09-10-2005, 10:30 AM
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First- Bowtie,those heads started around 87 on 305/350. They have 1.94/1.5 valves and are supposed to be 64cc. I have cc'd 4 different sets and gotten 62-65cc. They are swirl port heads and really aren't a good design for horsepower but do help create torque.


Second-lanierledford, What is the cc's on the valve reliefs of the pistons? I figure most likely around 1cc per relief so approx a .045 thickness gasket will yield you around 9.5 to 1
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Old 09-10-2005, 11:03 AM
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cyclone, thanks. I don't know the relieve, but with a straight edge across the block to the top of the piston (on tdc) its .042
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Old 09-14-2005, 01:58 PM
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re:head info needed

Hey thanks all. I had to go to PA over the weekend and was away from my computer. Syclone if these are swirl port as you figure could they have come off of a camaro. If these heads were put on a 350 using flat top pistons any idea the compression ratio?? Thanks all for your help
I'll be back
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Old 09-14-2005, 05:18 PM
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Figuring most flat tops have a valve relief of -4cc and using a .045 gasket you would be around 10:1
Yes they could be off of a camaro.
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Old 09-14-2005, 07:06 PM
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193 casting number heads are mostly likely swirl port (intake) heads from an 87-95 model year fullsize car (Caprice), or light truck. They were never officially used in Fcars (unless the engine factory ran out of the right heads, which did happen back then). They should have a projected nose plug placement (i.e. inserted into the chamber between the valves) and that plus the swirl intake port (under the intake valve if you remove one) makes them fast-burn heads per GM's own description from the mid 80s. Fast burn means less torque generation while the piston is still rising to TDC, so there is merit in burning the mixture quickly and that plus emissions were the reasons they were built that way.

IIRC they are 64 cc using flat top pistons at 9.5 to 1 static CR in pass car applications, and dished pistons with 8.5:1 CR for light trucks. Both have 1.94" diam intake and 1.50" exh valves.

They're erroneously referred to as "junk" or the "worst heads GM ever made" by many on Thirdgen.org and elsewhere but the flow data on them shows that they're no better or worse in stock unported form that the iron L98 heads (083 casting). There are several threads here on FSC that discuss them, as well as many more on Thirdgen.org that mention them and a few on both forums that discuss them in detail. They can be ported to flow very well even if the swirl ramp is retained (but smoothed) as shown by the results from people at TGO. I think there are two people here on FSC that have ported and used them with similar findings (but unfortunately no documented data). HTH.
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Old 09-14-2005, 09:46 PM
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I know a machinst that says he's had some good results after removing the vane from the port but the heads are very crack prone.
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