Thread: 350 Build

Tweet

Tech,
No I do not actually. Wish I did but most of my tools I have are for detailing or auto body. I really need a set of calipers because there have been numerous times I've needed them.
I also do not know about getting the pictures of the engine today but am still going to try to here a little later and post them tonight. If not then it will be Thursday before I post them.

OK, when produced at the factory, blocks are cut with a nominal block deck height of +/- 9.025" (centerline of the main bearing bore to the block deck where the head bolts on). This assumes that the block has not been decked by some knot-head before you got it. Adding up your stack of parts will tell you the piston deck height and the gasket to use for a tight squish. 350 crank radius of 1.74" + 5.700" rod length + 1.560" piston compression height = 9.000". Theoretically, this would leave a piston deck height of 0.025", which, together with an 0.015" head gasket would produce a squish of 0.040".

However, don't assume anything. Always measure your clearances before final machining and assembly. You still have the pistons in the short block and that's good. With the motor on a stand, tilt it so that one bank is level. Using a steel rule and a set of feeler gauges, we'll find the actual piston deck height. Standing at the side of the block, span the edge of your rule across the bore about 1/4" from the edge of the bore at either the 3 oclock or 9 oclock position of the piston. Slide feeler gauge blades between the bottom of the edge of the steel rule and the piston crown. Checking the piston at noon or 6 oclock will allow the piston to rock on its wrist pin and tilt one way or the other, giving you an erroneous reading. 3 or 9 is directly above the pin. Rotate the crank a few degrees backward and forward and re-check your measurement to make sure the piston is at TDC. If you find a piston deck height of 0.020" to 0.030", you'll be fine with an 0.015" steel shim gasket (assuming the block decks are smooth and parallel). Do this measurement on each of the four corners of the block to see if there is a slope to the block front to rear and/or a difference from one bank to the other that would require cutting the block decks to correct the fault.

Tech, again you have helped me a lot here and I will go ahead and do this whenever I can get a buddy with tools over here. I have no engine tools such as micrometers, dial calipers, bore gauges, etc etc. The tools that you are speaking of, where should/can I buy these at? I was looking at Summit and see they have quite a variety of tools but not sure how good they are. Instead of borrowing a friends of mine I wouldn't mind buying my own because I really need them for other builds that I have planned.
As for the pictures, it just didn't happen tonight. The engine is at my parents house and I have been gone a lot lately and need to get over there to get the pictures, then bring them back to the fire department and use their computer to post them here so it is a bit of a hassle and I have been studying for my finals in a personal finance class at the local college. The final exam is tomarrow so I will be busy with that all day and tomarrow night I will take them and post them on Thursday. I will get some close pictures of the cylinder walls, the tops of the pistons and underneath as well. Like I said, I pulled the heads, oil pan, water pump, fuel pump, etc. The water pump was noisy so I figured I might as well replace all of this and know that it's all new and in good working order.
I am very picky as far as engines go and wanting to make sure I know everything that is in them and that it's all done correctly and no corners cut. One thing I will do tonight is order a SBC engine building book on Amazon.com There is one that I have to find that a friend has and said is old but very good and explains the basics of measuring and assembling a sbc.