BBC Heads -454
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
BBC Heads -454
I have found a set of new Edelbrock 60459 alum heads (110 cc chambers, 2.19 x 1.88 stainless valves). Will those heads perform well on my 74 454 with flat pistons? Right now I'm running closed chambered 427 heads that make lots of compression - car runs good. I have read that the more "open" style heads needed domed pistons and don't want have to change the flat-tops out.
I have the cam (7162) and manifold (air rpm) that Edelbrock recommends to use with those aluminum heads.
Mike
I have the cam (7162) and manifold (air rpm) that Edelbrock recommends to use with those aluminum heads.
Mike
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
110 cc chambers are not that big. I would have to look up what a closed chamber head is but it might be around 106-108. True open chamber are about 119. So you are not going to loose much compression at all with those heads. It can be made up with a head gasket.
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Compression will be very low... flat top pistons with the GM open chamber heads at 113cc gives you 8.5:1. You can have the edelbrock heads angle milled to 100cc which will bump compression to about 9.5:1. More than that will require domed pistons.
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Good question. On my LS-5 454 I had the factory open chamber 113cc heads. I switched to the 100cc Edelbrock heads (~9.5:1 CR) and changed the cam from a 219/229 hydraulic flat tappet to a 224/230 hydraulic roller. I picked up over 60 rear wheel horsepower (328 to 392). How much was heads and how much the cam? Dunno. YMMV...
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
It a good deal on the new alumin heads, but I just had my closed chambered heads all reworked...so for 1200.00 difference guess I'll stick with the cast 427 heads and maybe throw a 100 shot of NOS on and still be money and HP ahead.
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