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#1 |
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 $$ if you wanna play ![]() |
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#2 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: trying to figure out what kinda "crack prone head"s i have
Pull the valve covers and they will tell you
Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#3 |
Registered User
Join Date: Mar 2012
Location: Lincoln, IL
Posts: 880
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Re: trying to figure out what kinda "crack prone head"s i have
lol these heads are refered to boat anchors and commonly found on the small block chevys. i believe there 882 castings or something but those are also 400 heads. so the heads i have just came on 350s thats all i remember. ill pull a cover and check tomorrow....
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Her name is Quicksilver 1978 Chevrolet silverado, shortbox stepside currently being swapped IN is a LM7 5300 vortec, 4l80E, factory 4.11s, slammed, a dream ride and coined QUICKSILVER gotta pay $$ if you wanna play ![]() |
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#5 |
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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#6 |
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
Yes thats them thanks! the crack o matics. good thing mine havent cracked yet
__________________
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 $$ if you wanna play ![]() |
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#7 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: trying to figure out what kinda "crack prone head"s i have
The 882s actually flow decent they are the best of the worst heads
Posted via Mobile Device
__________________
377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#8 |
Registered User
Join Date: Mar 2012
Location: Lincoln, IL
Posts: 880
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Re: trying to figure out what kinda "crack prone head"s i have
462624s jog my memorie to good, all sorts of night marish details on google about these
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Her name is Quicksilver 1978 Chevrolet silverado, shortbox stepside currently being swapped IN is a LM7 5300 vortec, 4l80E, factory 4.11s, slammed, a dream ride and coined QUICKSILVER gotta pay $$ if you wanna play ![]() |
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