Frebie heads. Worth it?
Thread Starter
Heel & Toe
Joined: Nov 2004
Posts: 15
Likes: 0
From: North Bay CA
Frebie heads. Worth it?
A month ago, I picked up a block that was taken out of a 73' pickup.
Guy had the heads from the block, and he let me take them as part of the deal. The guy I got them from said they could have the intake ports bored to 2.02. The VIN on them is 3998993. Supposedly, these heads were put on low performance cars and trucks. My question is are they even worth keeping? Any one have any experience with these heads?
Guy had the heads from the block, and he let me take them as part of the deal. The guy I got them from said they could have the intake ports bored to 2.02. The VIN on them is 3998993. Supposedly, these heads were put on low performance cars and trucks. My question is are they even worth keeping? Any one have any experience with these heads?
Burning Brakes
Joined: Jan 2003
Posts: 755
Likes: 32
From: Roswell Georgia
According to John Lingenfelter's cast iron head chart in his book, you have a set of nominal 76cc heads with 1.94 intake/1.5 exhaust valves. The nominal port volumes are listed as 159cc for the intake and 65cc for the exhaust.
Depending upon the goal for rebuilding the truck block, you can either use them as is (stock), or save the money you would spend modifying them for a set of aftermarket cast iron heads such as the Summit Racing SUM-152123 heads ($649 a pair). These fully assembled heads have the 2.02 intake/1.60 exhaust valves, screw-in studs, nominal 67cc combustion chambers, and a nominal 165cc intake port volume.
Hope this helps!
- Greg Smith, Perpetual Corvette Mechanic
Depending upon the goal for rebuilding the truck block, you can either use them as is (stock), or save the money you would spend modifying them for a set of aftermarket cast iron heads such as the Summit Racing SUM-152123 heads ($649 a pair). These fully assembled heads have the 2.02 intake/1.60 exhaust valves, screw-in studs, nominal 67cc combustion chambers, and a nominal 165cc intake port volume.
Hope this helps!
- Greg Smith, Perpetual Corvette Mechanic
Thread Starter
Heel & Toe
Joined: Nov 2004
Posts: 15
Likes: 0
From: North Bay CA
Thank you for the info. 
This will be my first from-the-ground-up engine build. Its going in a 72' 240z. I'm looking for around 350hp, hence my inquiry as to the merit of these heads.
This will be my first from-the-ground-up engine build. Its going in a 72' 240z. I'm looking for around 350hp, hence my inquiry as to the merit of these heads.
Last edited by nbayZguy; Dec 2, 2005 at 11:49 PM. Reason: grammer error
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by mr.beachcomber
According to John Lingenfelter's cast iron head chart in his book, you have a set of nominal 76cc heads with 1.94 intake/1.5 exhaust valves. The nominal port volumes are listed as 159cc for the intake and 65cc for the exhaust.
RACE ON!!!
Team Owner
Joined: Feb 2005
Posts: 32,519
Likes: 1
From: central America
St. Jude Donor '08-'09
Originally Posted by nbayZguy
A month ago, I picked up a block that was taken out of a 73' pickup.
Guy had the heads from the block, and he let me take them as part of the deal. The guy I got them from said they could have the intake ports bored to 2.02. The VIN on them is 3998993. Supposedly, these heads were put on low performance cars and trucks. My question is are they even worth keeping? Any one have any experience with these heads?
Guy had the heads from the block, and he let me take them as part of the deal. The guy I got them from said they could have the intake ports bored to 2.02. The VIN on them is 3998993. Supposedly, these heads were put on low performance cars and trucks. My question is are they even worth keeping? Any one have any experience with these heads?
trw
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One gear at a time
Joined: Aug 2003
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CI 8-9-10 Veteran
St. Jude Donor '07-'08-'09
Back in 1989, a high school buddy of mine built a 400 sb with flat top pistons; his compression was just under 11:1. He had his 993 heads cut for 2.02 and 1.60 valves. He ported them himself. He ran a Crane Blue Print of the Chevrolet solid F/T Off Road cam, with 1.6 stamped long slot rockers. He topped it with a Torker intake and a 750 double pumper. With a TH 350 and a 3000 stall, and 4.10 gears he eventaully got into the 11.9s in his 67 Chevelle. I had a 70 SS 454 that ran 12.7s. He would walk away from me at any speed in any gear.
Better heads are available, but the 993s can be made to do good things.
Better heads are available, but the 993s can be made to do good things.
Thread Starter
Heel & Toe
Joined: Nov 2004
Posts: 15
Likes: 0
From: North Bay CA
[QUOTE=wesmigletz] With a TH 350 and a 3000 stall, and 4.10 gears he eventaully got into the 11.9s in his 67 Chevelle. I had a 70 SS 454 that ran 12.7s. He would walk away from me at any speed in any gear.
QUOTE]
Sounds like these heads are a good find! Appriciate the input.
QUOTE]
Sounds like these heads are a good find! Appriciate the input.
Race Director
Joined: Apr 1999
Posts: 11,520
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From: CORVETTE 77 385 C.I. TEXAS
Originally Posted by wesmigletz
Better heads are available, but the 993s can be made to do good things.
Considered by some as "Intermediate" heads in stock form & used on 350 & 400.
