GM 010/020 Blocks

Aaron Keown · 03-10-2009, 09:16 PM

People have made 600+ horsepower and ran 9000 r.p.m. with good rock blocks,good being the key word there.The thing that sucks about rock blocks the most is you really don't know if you have a good one until you build a high performance engine with one and take the chance of knocking the side out of it..Yes you can use a sonic checker and all that but it still no guarantee.A reasonable number is probably 500-550 h.p and about 8000 r.p.m. I would not go more than 4.070 on the bore size on the block you are talking about.I have also seen brand new engines built with rock blocks knock the side out ,so needless to say I am not really a fan of them.With the price of after market blocks as reasonable as they are any more I really don't see much point in using one unless it is for a budget build.Also,what kind of crankshaft are you looking for,after market or a factory core?

03-10-2009, 09:16 PM	#2
Aaron Keown Junior Member Join Date: Mar 2004 Location: 1710 Dutch Lane,Jeffersonville,IN Posts: 63 Likes: 0 Liked 0 Times in 0 Posts	Re: GM 010/020 Blocks People have made 600+ horsepower and ran 9000 r.p.m. with good rock blocks,good being the key word there.The thing that sucks about rock blocks the most is you really don't know if you have a good one until you build a high performance engine with one and take the chance of knocking the side out of it..Yes you can use a sonic checker and all that but it still no guarantee.A reasonable number is probably 500-550 h.p and about 8000 r.p.m. I would not go more than 4.070 on the bore size on the block you are talking about.I have also seen brand new engines built with rock blocks knock the side out ,so needless to say I am not really a fan of them.With the price of after market blocks as reasonable as they are any more I really don't see much point in using one unless it is for a budget build.Also,what kind of crankshaft are you looking for,after market or a factory core?