Big-block energy in a small-block combination is spelled "three-eight-three."
Whether your vehivle is screaming for big-block endowment however your notecase is crying for small-block Compassion, then a budget 383 might be decent the silencer you're looking for. The front 383 strokers were based on 350 blocks and utilized a 400 small-block crankshaft to accession cubic inches. That was back when 400 blocks were quite daily and manufacturers hadn't all the more figured gone that a 3.75-inch crankshaft costs approximately the duplicate to toss as a 3.48-inch unit. Whether you're rebuilding your 350, then you might extremely spec outside a 383 apparatus for an immediate 10 percent accrual in horsepower and torque from sluggish to redline.
Instructions
1. Alpha with any small-block 350 engine, preferably four-bolt leading. You can custom an LT-series engine, nevertheless the ancillaries Testament expenditure augmented. Bear the block bored 0.030 over to 4.030 inches. Chalk up the leading bores align-bored and honed, acquire the deck surfaces milled Apartment lodgings (decked) and bear the lifter bores checked and honed. All told, you should accept approximately $700 into the block in get payment.
2. Get any one of the indefinite 383 stroker crankshaft/rod/piston kits on the bazaar. You could one's damndest to treasure a works 400 crankshaft, rods and pistons, on the other hand they're consolidated to treasure trove as a establish and you'll desideratum To possess the leading journals cut down from 2.65 inches to 2.45 inches. Better to buy new parts so that you can spec the exact rods and pistons you desire. Speaking of pistons, order a set of forged units designed to yield about 9.5-to-1 compression with a 64-cc combustion chamber.
3. Acquire a set of new or used, fully assembled L31 GM Vortec cylinder heads. These fist-generation Vortec heads flow about 239/147 cubic feet per minute of air at 0.50 inch lift, which will support about 490 horsepower in completely stock form, and are a direct bolt-on for any small-block. You can find L31 heads in 1996-1999 GM full-sized trucks, 1996-2003 Chevrolet Expresses and Tahoes, 1996-2003 GMC Savannas and Yukons and the 1999-2000 Cadillac Escalade.
4. Purchase an intake manifold designed to fit a carburetor to Vortec heads; the Edelbrock Performer RPM is a good choice, but Weiand and Professional Products both make competitive offerings.6. Coat the tops of the pistons, the combustion chamber roof, the insides of the intake and exhaust ports and the inside and outside of your tubular exhaust headers (any used 1 5/8-inch headers will work) with thermally insulating ceramic powder coating. This will help to keep heat and pressure inside the engine where it can make power instead of leaking into your cooling system and engine bay.7.
If you're looking for something different, take a Stare at a high-rise dual-plane intake designed for 1996-2007 Indmar marine engines.5. Install a hydraulic, flat-tappet camshaft with about 222 degrees intake and 229 degrees duration at 0.050, 0.500 inch lift intake and 0.510 inch lift exhaust (with 1.6-to-1 rocker arms) with about a 112-degree lobe separation angle. This camshaft will be fairly tame in a 383, and the L31 head's flow begins to fall off over 0.500 inch lift anyway.
Top the engine off with 1.6-to-1 roller-tipped rocker arms, a 700-cfm carburetor, a GM HEI (high-energy ignition, coil in cap) distributor, a multi-spark ignition box, wide-gapped spark plugs, a standard oil pump and some synthetic race oil.
