Engine and Cylinder heads ID
Thread Starter
Intermediate
Joined: Feb 2013
Posts: 30
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Engine and Cylinder heads ID
Hello Guys,
Is there any way to identify spec of cylinder heads with opening parts? I want to order long tube headers for my C3 1972 (Original 350 small block), but I am not sure to select which type Oval or D-port shape.
Is there any way to identify spec of cylinder heads with opening parts? I want to order long tube headers for my C3 1972 (Original 350 small block), but I am not sure to select which type Oval or D-port shape.
Le Mans Master
Joined: Nov 2006
Posts: 7,215
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From: Orlando FL
http://www.worleyauctioneers.com/photos/kingpart1/6052
this is a picture of you exhaust ports
Hope that answers the question
this is a picture of you exhaust ports
Hope that answers the question
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Race Director
Joined: Jul 2001
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Le Mans Master
Joined: Nov 2006
Posts: 7,215
Likes: 1
From: Orlando FL
Thread Starter
Intermediate
Joined: Feb 2013
Posts: 30
Likes: 0
Thanks for all clarifications, just one more thing, I'm getting difficulty in selecting a long tube headers, which type/size would be the best for this engine? I prefer Hooker super competition, but When I searched I found some bad feedback. Please advise. My corvette is 1972, auto transmission (hydra-matic), power steering and AC.
Race Director
Joined: Jul 2001
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The casting number is actually 3970010 which is the type used in virtually every GM product during the 70s. It has nothing to do with the heads or valve diameter. Given that your engine is the base 200 HP, valve sizes are 1.94 intake and 1.50 exhaust.
Race Director
Joined: Jul 2001
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Very honestly Mohamed, with the base engine/auto combo you've got, I wouldn't bother. You'll get maybe 99% of the power with stock manifolds and a 2 1/2" free flowing exhaust system. At a much cheaper cost.
Race Director
Joined: Jan 2000
Posts: 12,399
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From: San Jose CA
I disagree with the sentiment on headers vs stock exhaust manifolds.
On my 78 L-48, there was both a noticeable "butt dyno" change, as well as a 3/4 second gain in 0-60 time going from the stock manifolds to 1 5/8" long tube headers.
Pulling the pan will tell you whether it's 2 or 4 bolt. Since it's the 200hp motor, it's likely just a 2 bolt. It can be converted to 4 bolt by the machine shop. I'm more fond of building second motors if the original is still in one piece.
On my 78 L-48, there was both a noticeable "butt dyno" change, as well as a 3/4 second gain in 0-60 time going from the stock manifolds to 1 5/8" long tube headers.
Pulling the pan will tell you whether it's 2 or 4 bolt. Since it's the 200hp motor, it's likely just a 2 bolt. It can be converted to 4 bolt by the machine shop. I'm more fond of building second motors if the original is still in one piece.
Racer
Joined: Mar 2003
Posts: 448
Likes: 21
From: Klein Texas
My '72 L48 has 2 bolt main caps. My experience is they are plenty strong except in the highest of HP configurations.
I've only seen one cap failure and it was in a boat. When disassembled the three middle caps were broken (it still ran) but boats, unlike car engines, spend a long time at WOT.
I've only seen one cap failure and it was in a boat. When disassembled the three middle caps were broken (it still ran) but boats, unlike car engines, spend a long time at WOT.
