is it true that aluminium heads on lt-1 95 are same as pick up iron heads vortec desing?

 

I don't think so.

 

Nope. The LT1 is a totally different animal.

 

The L31 heads were copied from the LT1 heads on the Caprice/Roadmaster which actually flowed better than the LT1 heads on the Camaro/Firebird and 'Vette but they're cast iron.

So no.

 

The LT-1 and LT-4 heads have their own unique intake bolt pattern. It isn't the same as Vortecs and it isn't the same as earlier bolt patterns, either. It's it's own unique animal.

LT-1 aluminum heads have intake ports and chambers similar to earlier non-vortec heads.

LT-4 aluminum heads have ports and chambers that are almost identical to cast iron L-31 Vortec heads, but they still don't share the Vortec intake bolt pattern.

I beleive that with some re-machining you could make an LT-4 intake manifold bolt to cast iron vortec heads. Obviously, you could also use a Caprice intake to bolt up to them, as well, since they were designed to work together in the first place. LT-1 heads won't fit on an L-31 Vortec cylinder head, however- the ports won't line up right, even if you got the bolt pattern the same.

Remember that if you're using the LT-4 or Caprice intake on your Vortec heads you STILL have to make provisions for water ports since earlier motors don't have reverse-flow coolant systems. You have to do some drilling, tapping and plugging. Ask around with anyone who has converted an LT-1 intake for use on an earlier engine how they did this. It's not very difficult, but it has to be done if you are not running a late model reverse flow cooling system type engine.