75 350 head size?
Thread Starter
Instructor
Joined: Nov 2004
Posts: 189
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From: Somerville NJ
75 350 head size?
Hi my son want,s to build a 75 350 I have. He would like to do .030 over bore use stock crank change cam ( need ideas) then at a later date add some better heads. To choose a set of pistons I need to know what size the stock heads were on a 75. Any ideas? 
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
76CC. If you design your bottom end to use stock heads and you are using a stock crank. Deck the block to 0.00 and use flat tops. You can then upgrade to a 75 CC aluminum head later and not have to change the cam. Cam choice depends on your trans, rear end gearing, intended use and budget. Give more info!
Thread Starter
Instructor
Joined: Nov 2004
Posts: 189
Likes: 0
From: Somerville NJ
Thanks for the replies. He is planing on putting it in a 84 z 28 auto Don't know what rear it has may well be stock for a auto trans. he will be using. Working on a low budget a friend has the block at his school so shop costs are parts only.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
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From: Unreconstructed, South Carolina
Better safe than sorry ... check the heads' casting numbers (under valve covers) against an accepted reference here:
http://www.mortec.com/castnum.htm
BTW ... choices (of aftermarket performance sbc heads in the 74cc-76cc range) are rather limited.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
As said ... they should be 76cc ... but they may've been changed out over the years to something else.
Better safe than sorry ... check the heads' casting numbers (under valve covers) against an accepted reference here:
http://www.mortec.com/castnum.htm
BTW ... choices (of aftermarket performance sbc heads in the 74cc-76cc range) are rather limited.
Better safe than sorry ... check the heads' casting numbers (under valve covers) against an accepted reference here:
http://www.mortec.com/castnum.htm
BTW ... choices (of aftermarket performance sbc heads in the 74cc-76cc range) are rather limited.
I know AFR makes a 180 and 195 in this size. They are expensive though.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
You are so right ... I had that very choice in mind ... as said, choices limited. There are ranges of head sizes and ranges of piston compression heights that are rather common & thus relatively inexpensive ... move outside those ranges & choice:$ becomes inversely proportional.
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Le Mans Master
Joined: Apr 2006
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Likes: 95
I don't see with a 350 and aluminum heads a need for 75cc
chamber heads. If your going to stroke it use the bigger chamber
if not buy a 64 to 67 chamber head.
chamber heads. If your going to stroke it use the bigger chamber
if not buy a 64 to 67 chamber head.
Last edited by Little Mouse; Mar 10, 2007 at 02:38 PM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
No need for them but if he can't change heads now, he could set it up to run as strong as possible with the stock heads. Then, later, if he can afford to upgrade, he can just change the heads and not have to mess with the cam and lifters. That would be the advantage to go with 75 CC aluminum heads. If the cam doesn't need to be changed later, it might offset most of the extra cost to go to the AFR's and have a quality head with exceptional flow for not much total cost difference and save the hassle of resetting up everything. Either that or buy a set of aluminum 64 CC heads now and build it to match them.
Le Mans Master
Joined: Apr 2006
Posts: 5,403
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If he changes pistons to a flat top and decks the block even
leaves the stock iron heads and l/48 cam he is only going to be at
around a soild 9.00 compression with 76cc heads. why go out and
buy a 75cc chamber aluminum head when he will change cams.
a 64cc chamber and aluminum head with a mild upgrade in cam will be perfect in the end, and if he runs around with 9.00 and iron heads
hes not going to be pinging. I just can't see any reason to put a
75cc aluminum head on a 350 with flat top pistons and end up with
only 9.0 compression.
leaves the stock iron heads and l/48 cam he is only going to be at
around a soild 9.00 compression with 76cc heads. why go out and
buy a 75cc chamber aluminum head when he will change cams.
a 64cc chamber and aluminum head with a mild upgrade in cam will be perfect in the end, and if he runs around with 9.00 and iron heads
hes not going to be pinging. I just can't see any reason to put a
75cc aluminum head on a 350 with flat top pistons and end up with
only 9.0 compression.
Safety Car
Joined: Jun 2002
Posts: 4,135
Likes: 1
i put edlebrock alum heads on my new stroker build.(they were 1500.00at winners circle) 64cc,had the 76 cc heads with old stroker build w/ 2.02 intakes, the new stroker dynoed at 431 hp 532 tourque, also using keith black hyperth flat top pistons,compression is up to 10.5 to1---------------------------
