I'm Confused Here.....
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Instructor
Joined: Mar 2007
Posts: 169
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From: Tullahoma Tennessee
I'm Confused Here.....
I'm looking into rebuilding my top end, and I'll probably go with Edelbrock heads. I have a '77 L48 stock except for a Holley 750 VS. So I was on Edelbrock's site looking at the new E-Tec heads, they list an E-Tec 170 and an E-Tec 200, the difference in the two being the intake and exhaust port size. Here's where it gets strange. The E-tec 170 supposedly gets 9.5 to 1 compression with stock pistons and the E-tec 200 gets 10.2 to 1. But they both have a 64cc chamber size.
So how does the compression change that much when the chamber size is the same. I almost get the feeling that they're just making these numbers up off the top of their head.
Anyway, I would like to get about 400 HP and 400 Ft/lbs tq from pump gas so would these heads in combination with the Performer RPM manifold get me those numbers. I know I'll have to upgrade my cam as well...
So how does the compression change that much when the chamber size is the same. I almost get the feeling that they're just making these numbers up off the top of their head.
Anyway, I would like to get about 400 HP and 400 Ft/lbs tq from pump gas so would these heads in combination with the Performer RPM manifold get me those numbers. I know I'll have to upgrade my cam as well...
Le Mans Master
Joined: Apr 2006
Posts: 5,403
Likes: 95
Stroke of the engine makes the difference, edelbrock is
fiquring on the 170 runner being used on a 3.48 stroke 350, the
200 runner head would most likly be used on a 3.75 stroke 383
size engine. You do not want the 200 runner head if your buiding
a hydraulic low rpm 350 size street engine. Consider the 180
runner IK180 brodix head. $1050.00/$1095.00. very good for a 350.
www.brodix.com. www.summitracing.com www.competitionproducts.com
brodix ph# 479-394-1075. Brodix or edelbrock head can do 400 hp
for you, edelbrock rpm is a good all around manifold, good pick for
a 400 hp 350. brodix has been making aluminum heads since the 70s.
fiquring on the 170 runner being used on a 3.48 stroke 350, the
200 runner head would most likly be used on a 3.75 stroke 383
size engine. You do not want the 200 runner head if your buiding
a hydraulic low rpm 350 size street engine. Consider the 180
runner IK180 brodix head. $1050.00/$1095.00. very good for a 350.
www.brodix.com. www.summitracing.com www.competitionproducts.com
brodix ph# 479-394-1075. Brodix or edelbrock head can do 400 hp
for you, edelbrock rpm is a good all around manifold, good pick for
a 400 hp 350. brodix has been making aluminum heads since the 70s.
Last edited by Little Mouse; Jul 8, 2007 at 05:47 AM.
