MK 82

The place that did my LT4 heads CCed them and swears they are 63cc. I thhought they were 54CC. What gives.

They are definitely LT4 heads.

Eddie

blue94

from the factory... 54cc

PLRX

MK 82

The man checked them twice and they came out at 63 and change. Has anyone here personally CCed an LTX head?

PLRX

The cc for the LT4 heads is 54CC (54.4cc). If those are 63cc those are not LT4 OEM heads. Check the number on the heads and compare.

Here is proof.

http://www.grandsportregistry.com/lt1vslt4.htm#GASKET

http://www.csgnetwork.com/compcalc.html

MK 82

Yes they are LT4 heads. No, the chambers have not been worked. First time the heads have been off. I will double check his work as soon as I gather the equipment. I didn't want to call him a liar. These folks build $300,000 race cars and engines. Mosler automotive. Claims to have checked it twice.

I am well aware that multiple sources list them as 54CC.

Eddie

PLRX

I remember in 1997 I went to the GM dealer to buy a brand new LT4 and the price was $7,000. If these people that build $300,000 race cars say the LT4 heads are 63cc then....they are 63cc.

MK 82

That's kind of what I thought. That's why I am trying to find someone who has CCed one of these heads himself.

Eddie

pappy.72

Maybe that is why my stock LT4 dynos at 500hp.

pmihaltian

Huh ?

MK 82

Just ordered my own 100 cc burette and stand. Will be able to check next week.

Maybe I have the only 63 CC LT4 heads ever made. Anybody want to buy them?

Eddie

PLRX

dude you need a tune you are way under

STL94LT1

Jonnymac

Aren't the exhaust ports 63cc. maybe thats what they were talking about.

JAKE

I personally cc'd the one combustion chamber on the 96 LT1 Vette heads I removed from my son's car last summer after a head swap. They measured 54 ccs.

We are talking combustion chambers, right? Not intake or exhaust port.

Jake