I am building a 305 for my 73' GMC right now. The truck had a 350 in it from the factory, but by the time I got it it had a 305 (who knows what happened to the 350). I feel the 305 will last longer then a 350, wich one would you trust crossing the desert? The 305 is a much thicker casting and wont overheat as easly. I work at Allied Motors(www.strokerkits.com) so I have full access to the most advance machine equipment. I first hot tanked the block and checked it for cracks and measured the line bore, all where perfect (think casting) next I put it in the shot-peen machine to clean it real well. After that I put it on the RMC CNC machine to be decked,blue printed and bored. Heres a pic of it finished on the CNC machine. (phone camera) img.photobucket.com/album...3300_1.jpg www.strokerkits.com/100_0379.jpg
the block blueprinted at .040 over it would of cleaned at .030 over but not be blueprinted. That extra .010 doesnt matter with the thick casting. I also balanced the rotating assembly, the pistons all weight the same with NO difference so are the rods down to a tenth of a gram. The crank with the flywheel and balancer on plus the bob weights started out 55 grams off on the flywheel side and 53 grams off on the balance side. When I was finished they where under 0.10 grams combined! This motor should last a LONG time and spin up quickly. I decked the block to deck height of 9.002 to add some compression.
The head swhere totaly gone through also, I installed new valve guides with valve job on the Sunnen valve/guide machine after that I milled .015 off each to ferther bump the compression. I went with a Claimer flattop piston also. I went with a "stage 2" tow/milage cam. Other then that I had the carberator rebuilt at Bradley carborators, they do awsome work and are very close to me. Its comming togeather well. Adam
93 RX-7 and
89 Colt(4g63)
Edited by: adamrx7 at: 1/1/06 11:03 pm
Truck is running great I havent regretted the 305 yet. I am thinking about building a 383 for it thoe. Heck I only got $600 in this motor. Adam
93 RX-7 and
89 Colt(4g63)