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Ol' Ron · 07-08-2020, 11:40 AM

How I deck a block and mill heads. The machike we use is called a Broach, not sure why and can't remember the brand, It has a flat area where the block/head is put on and clamped. The head then travels over a 10/12 cutter. with the block over the cutter, it's brought up until it that's the surface. The block is pulled back anr 2/3 thou is added to the cutter and the machine is put to work. after about 5 minutes the block is done. with a mirror you ca see if it got everything. Most of the time that's all it needs.
Angling heads:
Mlace the head on the flat surface and place a shim the thickness of the amount you want removed from the opposite side and clamp the head to the machine. For the stock cars we used a .07" shim and took 2 passes of .035 and one of .010 for a total of .080". Now after this you have to check valve and piston clearance. On an 8BA head to took an 80cc chamber down to 68cc's but not all heads are the same, I will soon do this to a set of eab heads which hove more valve clearance.
This may sound complicated and expensive, however, 800 bucks foe a fancy aluminum head might be cheaper.??????

07-08-2020, 11:40 AM	#15
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: 8ba block decking How I deck a block and mill heads. The machike we use is called a Broach, not sure why and can't remember the brand, It has a flat area where the block/head is put on and clamped. The head then travels over a 10/12 cutter. with the block over the cutter, it's brought up until it that's the surface. The block is pulled back anr 2/3 thou is added to the cutter and the machine is put to work. after about 5 minutes the block is done. with a mirror you ca see if it got everything. Most of the time that's all it needs. Angling heads: Mlace the head on the flat surface and place a shim the thickness of the amount you want removed from the opposite side and clamp the head to the machine. For the stock cars we used a .07" shim and took 2 passes of .035 and one of .010 for a total of .080". Now after this you have to check valve and piston clearance. On an 8BA head to took an 80cc chamber down to 68cc's but not all heads are the same, I will soon do this to a set of eab heads which hove more valve clearance. This may sound complicated and expensive, however, 800 bucks foe a fancy aluminum head might be cheaper.??????