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Building up an LT1

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In this Tech Tip, John discusses LT1 rotating assembly options for a customer looking to build a solid autoX, drag, and occasional strip powerplant for his Firebird.

LT1, Stroker Style

“Hello, I am looking into stroker (3.75) rotating assemblies for my 1995 Pontiac Firebird Lt1. I Have a set of AFR 210 65cc chambered cylinder heads along with a 4 bolt main block that has already been bored .30 over. I would like forged crankshaft, rods and pistons as the car may see nitrous in the future. It is a street car that I take to road courses, auto-x and the drag strip I would like to burn 91 octane fuel so I am figuring keeping the static compression under 12:1, closer to 11.7 would be great. I do not know off hand if my block is at 0 deck height or not as I bought this engine used. I have a set of Fel-pro .039 compressed thickness head gaskets. I would like to avoid milling my heads if at all possible.     My main questions are:     Do you offer different bore size (.040? .045?) pistons than what are listed for rotating assemblies?    I would prefer H-beam rods, is this an option?    Brand preference is a non- issue as I am un-biased and trusting in your advice. I would like to keep the price under $1800 if that is possible.”

  • Jared P.

Hi Jared, You inquired about a rotating assembly for your Firebird. If your Chevy LT1 motor is a 2 piece rear main we offer a stroker style 383 Rotating Assembly kit, P/N 9151232 with the forged components of crank, rods ( I beam), and pistons available in .040 size.  It comes with the correct bearings for the 350 block in standard for mains and 5.7 rods.  Compression ratio is 9.6 with 64cc heads which makes it streetable.  If you have an LT1 with a one piece rear main block and want higher compression just let us know and we can put something together.  Feel free to visit us on the web at or call 1-800-979-0122 with questions or to place an order.

  • John W.

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