C4 head ID ... and advise needed
Thread Starter
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
C4 head ID ... and advise needed
Blew one head gasket big time ... so the Questio is ... what heads do I have on this 84 C4 Std coupe 350- 5.7 auto / and cross fire inj
do they have the 202 valve size already ?
and are they better heads than
Old double 441 fuelie 327 heads from back in the day
Just happen to have a set ... 202's
my machinist says that the stock 84 vette heads are a much better design and stick with what I have .. flow is the best
advice is good
Lawrence from Montclair So Cal
do they have the 202 valve size already ?
and are they better heads than
Old double 441 fuelie 327 heads from back in the day
Just happen to have a set ... 202's
my machinist says that the stock 84 vette heads are a much better design and stick with what I have .. flow is the best
advice is good
Lawrence from Montclair So Cal
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
Do the 441s have bolt holes in the front if not your accessorys wont bolt up. Dont know if you have 624s or 882s. Geussing someone added the larger valves?
http://purplesagetradingpost.com/sum...fo/heads1.html
Need to find your CC size you require
http://purplesagetradingpost.com/sum...fo/heads1.html
Need to find your CC size you require
Last edited by cv67; Jan 25, 2013 at 12:11 AM.
Thread Starter
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
I do know that the 441 heads have a few extra holes that were drilled and tapped in .. the last owner claimed i was setup for a belt drive and would accommodate the heavy 84 accessory package on the 84 vette ..
will verify once the heads are pulled off my C4
how will i know if the heads are 624's or 882's
can I assume that the casting numbers will tell the tail
my machinist dude is claiming that they will be the 882's
is that a win if they are 882's and what is the difference between the 624's and the 882's
will verify once the heads are pulled off my C4
how will i know if the heads are 624's or 882's
can I assume that the casting numbers will tell the tail
my machinist dude is claiming that they will be the 882's
is that a win if they are 882's and what is the difference between the 624's and the 882's
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,063
From: altered state
St. Jude Donor '05
havent seen #s on the 624s bet they are super close.
Basic smog head small valve deal. And very crack prone, thin castings. 882 not much better
Casting # youll see when you pull the valve cover off look for a stamped PN look at the last 3 digits.
Basic smog head small valve deal. And very crack prone, thin castings. 882 not much better
Casting # youll see when you pull the valve cover off look for a stamped PN look at the last 3 digits.
Last edited by cv67; Jan 25, 2013 at 01:04 AM.
Thread Starter
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
Vette heads ....
in The Heads ... Amen
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Well documented to be some of the worst heads Chevy ever made
http://www.thirdgen.org/techboard/po...260-post9.html
http://forums.off-road.com/gm-standa...tml#post146960
http://www.chevelles.com/forums/show...91&postcount=4
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Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
9.0:1 of the '84 L83 CFI to approx 10.2:1
L83 Heads
Casting number 462624
Heads: Iron,
Chamber Volume: 76cc
Intake Valve size: 1.94"
Exhaust Valve size: 1.50"
Intake Port Volume: 158cc
Thread Starter
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
Im feeling Humpped ...
Well documented to be some of the worst heads Chevy ever made
http://www.thirdgen.org/techboard/po...260-post9.html
http://forums.off-road.com/gm-standa...tml#post146960
http://www.chevelles.com/forums/show...91&postcount=4
I feel assimilated at the moment .. hopefully things will sort themselves out ..
forgive my senior moments here
I will verify more stats when I can get these heads off
they will either go to the round file or I will go to the round file
somethings gotta go .. just not sure now
thanks for the reality check list .. Ill confer more
Lawrence from Montclair So Cal style
Last edited by GT2Race; Jan 25, 2013 at 02:25 AM. Reason: stuff to change
Thread Starter
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
streetable or not
A much better head but the 64cc chamber of the 441 is going to bump your CR from the adv
9.0:1 of the '84 L83 CFI to approx 10.2:1
L83 Heads
Casting number 462624
Heads: Iron,
Chamber Volume: 76cc
Intake Valve size: 1.94"
Exhaust Valve size: 1.50"
Intake Port Volume: 158cc
9.0:1 of the '84 L83 CFI to approx 10.2:1
L83 Heads
Casting number 462624
Heads: Iron,
Chamber Volume: 76cc
Intake Valve size: 1.94"
Exhaust Valve size: 1.50"
Intake Port Volume: 158cc
Thread Starter
Racer
Joined: Sep 2012
Posts: 259
Likes: 0
From: Montclair CA
a bad note ....
what now ?
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Heads will be a perf improvement esp the increase in CR but you are still stuck with the cr*p CFI intake
and wimpy L83 cam so you may not see any improvement.
Compare the CFI intake ports to a reg SBC port; notice a problem
