i currently have the following a 4Age head bluetop and a 4AC block lying around..i am told the would fit

i need to no the following ...for me to pop on the 4age head to the 4ac do i have to change the pistons in the block as it still the 4ac inside if yes will the 4Age pistons fit with no problem...

iwill be running a weber carb 32.36 and having a manifold made...

Crankshaft of 4AC is lighter but weaker and you need to drill hole for the oil cooler pipes. Pistons are different.
But yes, the block itself is the same.

Oil cooler is optional.
4AC pistons possibly will work but resulting CR will be sub-9.

so the 4Age pistons will fit to that block do ireplace the whole conrods as well or can i use the 4Age psiton on that

max doing it right you need a difrent crank. I would not make that cost. rather pop up the 4age head and search for a full 4age engine. Finding a crank and pisons makes it expensive. I would take the shot and just use the bigpor thead on the 4ac lower block.

here is my list of things

i have its a complete blue top head..the bigport : distrubutor,and the 4Ac block so no use of letting it waste.would post pic but not sure how [/img]

On my 4AC block that was laying around we fited 4AFE head. The 4AC pistons, conrods and crank were left inside. The head was shaved a little bit.

Engine went in Celica AT180, and it pulls strong and sounds healthy, now for 2-3 000 km

so do i need to change the piston or can i leave it as it and just pop on the head on the 4AC block with out any problems would it give me major problems ....

what does he mean by "4AC pistons possibly will work but resulting CR will be sub-9."

what does he mean by "4AC pistons possibly will work but resulting CR will be sub-9."