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That engine isn't a lt1 it is a gm goodwrench crate 350 with 2 or 4 bolt mains made in Mexico. I have the same engine in my astro van and i have heard that they make 250 hp and 350 ft/lbs of torque out of the crate.

No,its not an LT1 as they are aH.P.engine built from 1970/1972.It is a Goodwrench crate engine,very common aftermarket.The casting 10066036 is known as the LM1,which was manufactured until 1988,the crate engine comes in many variations,but it is a 4 bolt main,2 peice rear.No matter what! it is an excellent motor low end.I run mine stock with 650marine Holley,sag,manifold,250/270 as it is.

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Q: My block casting numbers are 10066036 Is this a LT1?
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