Hopefully pulling my 468 twin turbo this weekend-ish. I pulled it last season to find the bottom end in rough shape...stretched rod bolts, loose caps, and some bearings on the wrong side of good. Other than some low oil pressure though, the engine ran fine and never made any noise. I thought I dodged a bullet and my uncle put a new set of bearings in as well as some ARP rod bolts...he also put a nice set of crower rollers on it
Well...it looks like the crank may have not escaped damage all together and I got a pretty bad rod knock. I started looking at doing a 496 rotating assembly...the crank and rods in my 468 are cast, so I figured it was a good time to put something more turbo worthy in there. By the time all the work is done on the block though, I would be within striking distance of a 509 short block...which I figure is going to be better.
So here is what I am looking at after some recommendations from a recommended machine shop:
What I have:
The turbos: Air Research T04 .60's (I think these may be too small...they are the gale banks turbos with the hole drilled through the housing...they made about 12lbs on the 468, I have a couple larger set of turbos to choose from)
Heads:Aluminum GM Bowtie rectangular port heads # 14044861. 380 CC runners, 106 CC open chambers, angle milled .125. I used cometic head gaskets...051.
Intake Manifold:Team G single plane
Cam: Lunati 114 degree
advertised intake duration: 296
advertised exhaust duration: 306
Rockers: Crower Rollers
Ignition: HEI with ACCEL cap
Boost Timing Control Unit: Mallory 610-08
Carb: Draw through Holly 850, air horn machined off, boost referenced: 90 on the secondaries and 80 on the primaries
Fuel Pump: Holley version of the Clay Smith with 1/2 in/out
Regulator: Volumax regulator
I am looking to get: Short block 509 (or maybe a 515?)
Dart Big M sportsman block
Callies Compstar crank
Callies Compstar I Beam rods
JE Flat top pistons
Total Seal rings
H Series bearings
Any thoughts/ advice?