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#1
05-31-2025, 12:06 AM
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69 Z28 Cylinder Head Question
A friend in Seattle who owns a HIGH QUALITY Engine Machine Shop asked
me for help.............so Im asking the "Experts" at YENKO.Net A customer has a 69 z28 camaro. DZ302 engine. The car was made the second week of December 1968 The heads are 186 castings, they have press in rocker studs and are 1.94 1.5 valve sizes. They have had a valve grind on them but other than the guide knurling they are virgin. The outer head bolt boss' are chipped up badly and will need welding or head bolt washers. The date codes jive l 3 8 and l 4 8. The question I have, is this the proper build for these heads. 1.94 1.5 without studs and plates OR should I make them 202 1.6 with studs with or without plates? I have seen 186 heads with 202 1.6 with press studs before off a 302 but not like these are. Any help is appreciated.
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Chuck Sharin [email protected] Auburn,WA (30 miles South of Seattle) 70 Camaro R/S Z-28, L-78, R/S SS 69 Camaro COPO "recreation" 
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#2
05-31-2025, 01:34 AM
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69 Z/28 would be 186 castings, 2.02 / 1.60 valves, pressed in studs and no guide plates.
Those heads with 1.94 valves are not original to the car.
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Don't believe everything you read on the internet ... Ben Franklin
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| The Following User Says Thank You to Lynn For This Useful Post: | ||
mhm1966 (05-31-2025) | ||
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#3
05-31-2025, 05:10 AM
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What 1968 "186" Heads had 1.94 Valves ?????????
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Chuck Sharin [email protected] Auburn,WA (30 miles South of Seattle) 70 Camaro R/S Z-28, L-78, R/S SS 69 Camaro COPO "recreation"
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#4
05-31-2025, 11:41 AM
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"I" would've been the 9th month so that head would've been on an early 1969 engine. 300 hp 350 comes to mind for those heads....Joe
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1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO 1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E 1970 'cuda Moulin Rouge, 440-6, 4 speed
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#5
05-31-2025, 01:13 PM
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Perzactly.
More 186 heads had 1.94 valves than 2.02. Most L48 engines had 186 heads. Some had 041. I even tore down an L48 out of a 69 Full Size car that had one of each?
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Don't believe everything you read on the internet ... Ben Franklin
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#6
05-31-2025, 03:01 PM
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Thanks to all...........I'll relay your thoughts to my machine shop friend.............
It seems strange that somehow incorrect Sept 1968 Heads found their way onto a Dec 68' built 69 Z28
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Chuck Sharin [email protected] Auburn,WA (30 miles South of Seattle) 70 Camaro R/S Z-28, L-78, R/S SS 69 Camaro COPO "recreation" Last edited by CamarosRus; 05-31-2025 at 03:05 PM.
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#7
05-31-2025, 11:47 PM
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Rus,
Unless the owner of this Z bought it brand new and kept every single receipt, anything is possible.
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jerry455 (06-01-2025) | ||
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