Im swapping my old 289 for a 302 from an 88 foxbody. Its being rebuilt with a comp cam, hypernetic pistons, dart heads, 650 DP Holley etc etc. As for fitement, do I expect any issues with my C4 or anything else you guys might think of. Dont want any last minute surprises. I already have headers from the 289, but will likely replace them when everything else is fresh.

 

Make sure you use a flexplate for an 88 302.

 

First off, they're "hypereutectic" pistons

I wouldn't recommend a 650 DP, especially with an a/t. 600CFM with vacuum secondaries would better fit the engine, unless it's a really wild build.

Which cam are you using? Also, are you using the serpentine belt system off the 5.0, or are you going to transfer your timing cover from your 289?

 

hypereutectic? as in iron-carbon phase diagram?

So this would mean the piston's metal alloy when manufactured was heated above the melting point of the metal with the highest melting point?

-Gun

 

I had the flexplate problem when the builder was starting to balance the motor and no one local carried it. Got mine from KMJ.
Did anyone have a problem with the pullies lining up? We tried a few different ones and ended up having to modify one on the lathe.

 

Kinda, but not quite. Basically, it's an aluminum alloy with more silicon than it can actually alloy with. Properly treated, the extra silicon reduces heat expansion, increases heat insulation properties, and makes for a very strong material for its density. Basically, you get a cast piston that's lighter than a forged piece, stronger than a standard cast piece, with less heat expansion than either and that reflects heat back into the combustion chamber.

 

yup, they are great pistons for their price point (around 100 bucks for a set of flat tops with coated skirts).

as long as the OP is using the later flexplate and balancer he'll be fine. oh, and the timing cover from the 289 so you can install your fuel pump.

 

listen to Tad about the carb advise. Especially since you are running an auto
As for the bolting up, as far as I know all bellhousings from 66 are 6 bolt. since your car is 68 i don't expect any problems with fitment