672HP Pontiac 350 Car Craft Magazine

7 мая 2014 | Author: | Комментарии к записи 672HP Pontiac 350 Car Craft Magazine отключены
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It’s The Rodney Dangerfield Of Motors—But This One Deserves Respect

Pontiac 350s don’t get no respect. Eclipsed by the 389, 400, 421, and 455 engines, the 350 is the Rodney Dangerfield of motors. The only thing for a Pontiac 350, so the pundits is that a 400 or 455 bolts right in its — but that’s OK, because Pontiac 350 is sure to find a home in a boat. as the anchor.

bing, badda boom.

But been over 20 years GM produced traditional Pontiac and the supply of desirable big-inch is drying up. Yet the orphan 350—produced 1968-1979—is still fairly precisely because no one wants Pontiac’s 350 shares the same dimensions with its larger

Heads—including Edelbrock’s popular castings—interchange. It uses the same center-to-center Pontiac rods as the big yielding a great 1.77:1 ratio, even with its long 3.75-inch stroke. The drawback is the small 3.875-inch bore, which restricts breathing potential and creates interference with big valves and cams.

All right, beggars be choosers. For many die-hard lovers, the 350 is all they can find and Could a modern cam, rings, cylinder heads, and oxide technology get this off the reservation?

Yes! responds Fulper, the owner of Rock Engineering (RRE)—a leading high-performance parts supplier and building facility. Other the relatively rare ’68-’69 350 Pontiac never saw fit to develop the performance potential, yet Fulper has an awesome package that nearly 540 hp on the dyno and runs 11s in the quarter—without nitrous.

Adding just a small of squeeze boosted the output to 670 hp and Here’s what goes making a brave little (or is that a little Indian

Stock Pontiac iron can handle anything you throw at if properly prepped. The 326, 389, and 400 Pontiacs all share the 3.75-inch stroke, and a crank one of these other engines in a 350 if rebalanced. When swapping be aware that there are different crank flywheel-mounting pilot diameters — ’64-’76, and ’77-’79—which must with a matching flywheel or


The crank used on this is 0.020-inch undersize on both and rods, though beefy cranks can go 0.030- and 0.040-under on the and rods, respectively, without This engine uses Circle rod (CP-758P-20) and -groove bearings (MS-483G-20), which are in common oversizes.

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All 350s can be bored 0.060-over. The most blocks to look for were from 1968 through 1970. They may not have the mounting bosses needed for later applications, but their cylinder-bore valve chamfers less notching for valve with big cams. Check for contact by placing the valves, by clothespins, in the heads.

Coat the potential bore-to-valve areas with machinist’s place the head (with no on a bare block, and carefully the valves to establish the contact

Said to enhance sealing by 6 this engine uses the Total Seal gapless top conventional cast-iron second and a thin but standard-tension oil ring Not subject to gap erosion, the gapless can maintain optimum sealing longer than traditional The rings seal 0.060-over CP flattop pistons that, with the heads’ 72cc zero piston deck and Fel-Pro 1016 head bring the compression ratio in at a gas-friendly 9.5:1.

Fulper ordered the custom with the top ring lands 0.300-inch below the piston to both enhance durability nitrous oxide and to provide clearance for the valve notches by the 350’s small bore-size.

oil pumps aren’t required. The Ram Air IV pump driven by a heavy-duty driveshaft is sufficient if you control and rod side clearances. Excessive and pressure just increase losses and make the rings harder.

A 6-quart (with filter) oil pan is filled with conventional SAE 30 oil for run-in, 0W-0 Royal synthetic oil at the track, and 20W-40 on the

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