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11-25-2012, 09:29 PM
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#1 |
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Registered User
Join Date: Mar 2012
Location: Lincoln, IL
Posts: 880
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trying to figure out what kinda "crack prone head"s i have
so i have 76 cc combustion chambers came on 350 only, big dual heat risers in the exhaust ports, and there a thin casting made from 73 to 84... cant figure out which one these are... i have looked through all my past threads and cant figure out which heads i went on about.
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Her name is Quicksilver 1978 Chevrolet silverado, shortbox stepside currently being swapped IN is a LM7 5300 vortec, 4l80E, factory 4.11s, slammed, a dream ride and coined QUICKSILVER gotta pay $$ if you wanna play 
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11-25-2012, 10:10 PM
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#2 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: trying to figure out what kinda "crack prone head"s i have
Pull the valve covers and they will tell you
Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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11-25-2012, 10:19 PM
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#3 | |
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Registered User
Join Date: Mar 2012
Location: Lincoln, IL
Posts: 880
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Re: trying to figure out what kinda "crack prone head"s i have
Quote:
__________________
Her name is Quicksilver 1978 Chevrolet silverado, shortbox stepside currently being swapped IN is a LM7 5300 vortec, 4l80E, factory 4.11s, slammed, a dream ride and coined QUICKSILVER gotta pay $$ if you wanna play
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11-25-2012, 10:26 PM
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#5 |
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Registered User
Join Date: Aug 2010
Location: Olathe, KS
Posts: 61
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Re: trying to figure out what kinda "crack prone head"s i have
The heads you're likely referring to are the crack-o-matics. 462624 is the number on those. They are 1.94's. There are also a replacement heads with the same number that are supposedly pretty good with 2.02's.
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1982 C-20, 454, TH-400, PS, A/C, 71,000 miles 1978 C-20, 350, TH-400, PS, Non-A/C, 112,000 miles If it ain't broke, there is still probably room for improvement.  Speed costs money, how fast do you want to go? |
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11-25-2012, 10:36 PM
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#6 | |
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Registered User
Join Date: Mar 2012
Location: Lincoln, IL
Posts: 880
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Re: trying to figure out what kinda "crack prone head"s i have
Quote:
__________________
Her name is Quicksilver 1978 Chevrolet silverado, shortbox stepside currently being swapped IN is a LM7 5300 vortec, 4l80E, factory 4.11s, slammed, a dream ride and coined QUICKSILVER gotta pay $$ if you wanna play
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11-25-2012, 10:39 PM
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#7 |
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Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: trying to figure out what kinda "crack prone head"s i have
The 882s actually flow decent they are the best of the worst heads
Posted via Mobile Device
__________________
377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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11-25-2012, 10:49 PM
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#8 |
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Registered User
Join Date: Mar 2012
Location: Lincoln, IL
Posts: 880
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Re: trying to figure out what kinda "crack prone head"s i have
462624s jog my memorie to good, all sorts of night marish details on google about these
 and the thing is they have time limits. its not how hard you pound on em either. i pound on these things any chance i get, but i always know somethings bout to go ping or maybe when im just cruising.
__________________
Her name is Quicksilver 1978 Chevrolet silverado, shortbox stepside currently being swapped IN is a LM7 5300 vortec, 4l80E, factory 4.11s, slammed, a dream ride and coined QUICKSILVER gotta pay $$ if you wanna play
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