81 head replacement
Thread Starter
Intermediate
Joined: Oct 2015
Posts: 28
Likes: 1
From: Hart Michigan
81 head replacement
Thinking about replacing the heads on my 81. Found 2 different sets of edelbrock heads. One set is e-street with 64cc chambers ,the other is edelbrock performer with 70cc chambers. Which would work better ? Motor is stock now.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Get the small chamber heads....you need as much compression as you can get on the stock L-81 350.
Are you doing cam, headers, intake? Is the CCC carb still on it as well as the CCC distributor?
Make sure to use a 1204 Fel-Pro inake gasket with the heat riser block off.
Jebby
Are you doing cam, headers, intake? Is the CCC carb still on it as well as the CCC distributor?
Make sure to use a 1204 Fel-Pro inake gasket with the heat riser block off.
Jebby
Burning Brakes
Joined: Dec 2017
Posts: 1,043
Likes: 414
2023 C3 of the Year Finalist - Modified
I put the 64cc e street heads on my 75. They are great. The 64cc will raise the CR more than the 70cc. I paired it with the edelbrock performer EPS intake manifold, and edelbrock performer cam.
Installation was a breeze.
Installation was a breeze.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
I like GM Vortecs as well ... but Trick Flow DHC with small 60cc chamber would really boost the compression ... at about $1400 / pair, plus they fit conventional intake pattern.
https://www.summitracing.com/parts/t...0006/overview/
https://www.summitracing.com/parts/t...0006/overview/
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Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
FWIW, all GM Vortec for production sbc are iron & essentially same ... the above edelbrocks are aluminum as are TF's DHC 175
Yes, GM Vortec w/ 185 or 225 ports are "Bowtie" heads for performance/race and may be too much head for an 81's teeny cam
https://enginequest.com/enginequest/eq-catalog/
EQ Manufactures a line of high quality iron Vortec heads; superior to GM in several ways but still have the good fastburn-type chambers
pn CH350H fits conventional manifolds & doesn't require a vortec intake. Last time I looked, EQ heads were made in New Zealand. YMMV
Yes, GM Vortec w/ 185 or 225 ports are "Bowtie" heads for performance/race and may be too much head for an 81's teeny cam
https://enginequest.com/enginequest/eq-catalog/
EQ Manufactures a line of high quality iron Vortec heads; superior to GM in several ways but still have the good fastburn-type chambers
pn CH350H fits conventional manifolds & doesn't require a vortec intake. Last time I looked, EQ heads were made in New Zealand. YMMV