350/383 stroker conversion

[Jack]

Quick update: Ordered a custom grind Extreme cam from Comp, timing chain (true roller 3100) and 812-16 lifters. Just ordered a SCAT crank with clevitte bearings as an assembly for $240. Next step install the rotating assembly and check all clearances, grind what I need off and then prep the block for the machine shop for decking to zero.

When you pre-assemble to check for grinding/clearancing ... use OLD bearings and an OLD timing chain ... grinding dust will ruin new bearings & new chain. Of course you'll check with your new 383 crank ... and new cam ... but also check with whatever rods (& rod bolts) you'll end up with (check clearance from cam lobes) ... best to use an OLD piston too ... even though a 350 piston'll stick up above the deck about 1/8" ... doesn't matter ... what does matter is pin centered in bore. But, if your new pistons have offset pins then you must use one of the new pistons or one with same pin offset ... this fitment stage is where floating pins are about only advantage in a street motor. Have new cam installed/degreed in as you pre-assemble ... the 4 degrees or so it may need to be advanced can easily be enough to cause clearance issue between rod & lobe. BTW ... Spare .250" double roller chain for the 3100 set is Speed-Pro (sealed power) P/N 222-3DR58 or Cloyes P/N 9-130 or Clevite P/N C4012 or Perfect Circle P/N 94012.
JACK:gap

 

[gedmeyer]

GOOD ADVICE. The head of the rod bolts are what created the interference on my block.

 

[goingballistic]

Thanks Jack. I plan to do most everything with the "Old" stuff as you said I don't want to take the chance of screwing up the new stuff. I actually have someone working on this with me that works for Delphi Auto and is very knowledgeable and familiar with the 383 build. He has been great so far and saved me a lot of time and money already. I'm paying for his "consulting" time, very reasonable. I thought it best to get someone who has done this before as I had no desire to screw this up because the cost of the parts is herendous.

He plans to use the old pistons ( no rings) original 5.7 rods, new cam, old timing chain and the new 383 crank, old bearings. Once everything is cleared and ground and ready to rock, then the block goes for boring, deck cut, dip and everything else it needs. Then it's a "simple" put it back togeather routine.....simple being relative!!

Guys, you're advise has been and will continue to be invaluable, I appreciate ALL your input and you have also saved me time, money, headaches and given me the much needed piece of mind that I'm ( and he ) are doing the right thing...................also my boys are learning a HUGE amount about rebuilds and are jazzed to get this thing fired up.

 

[ibanezplayer]

Don't bore it more than 30 over,cus then the cylinder walls can't take the heat.