Is a 94 NA engine ok?

[88pacifica]

I need to replace the bottom end in my car quick. Is it ok to use an NA bottom end (common block) with an older head (non common block head, not cross drilled).
I guess what I am really wondering is what are the NA internals like and is it a problem to use a non cross drilled head on a common block (common blocks are cross drilled right?)

i think you will be ok, just dont attempt to exceed 7 psi. actually 7 might be kind of high?

[spoolboy]

Most 94 engines you'll find will be 2.5's. Which isn't a biggie. The 2.5's work "ok", but not perfectly on 2.2 electronics.

BUT, all NA engine blocks are NOT drilled for the turbo oil drain, which means you're either drilling the block (what about shavings, what if you mess up, difficult location to drill, etc) or you are putting the drain into the oilpan somehow instead of the block. An "old" head will work on a "new" block just fine. If you have a G style head (84-85) it will lower the 8.9:1 (2.5) to 9.5:1 (2.2) compression ratio by not quite .5, which will be much more turbo friendly than just using a "swirl" head. The rods are the same as what would be in an 88 T1, the pistons are slightly weaker depending on who you ask.

Probably just easier to get another turbo engine.....

Dennis

[dorquemada]

Is the old head a turbo head? I was under the impression that if the exhaust valves were from a N/A motor they'd get cooked in fairly short order.

[turbovanman]

Quote:

Originally posted by dorquemada Is the old head a turbo head? I was under the impression that if the exhaust valves were from a N/A motor they'd get cooked in fairly short order.

Correct, NA exhaust valves will melt in a turbo application. Also G head and 782 head valves will not interchange!