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Oct 6, 2004 | 08:16 AM

Hvymtlc5

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Melting Slicks

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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

Oct 6, 2004 | 08:22 AM

comp

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From: eville in

what thickness of headgasket you have

Oct 6, 2004 | 09:13 AM

Hvymtlc5

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Melting Slicks

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From: Lake Ozark, MO

Using Fel Pro 1017-1 .041 thickness

Oct 6, 2004 | 10:02 AM

norvalwilhelm

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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.

Oct 6, 2004 | 10:09 AM

zwede

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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.

Oct 6, 2004 | 10:23 AM

Hvymtlc5

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Melting Slicks

Joined: Mar 2004

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From: Lake Ozark, MO

Guess the bottom line is: will I see significant improvement (for the 1200.00 spent) over my closed chamber 427 heads that have been completely reworked?

Oct 6, 2004 | 10:41 AM

zwede

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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...

Oct 6, 2004 | 11:08 AM

Hvymtlc5

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Melting Slicks

Joined: Mar 2004

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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.