Best Heads For Ls 408 Stroker

The result was a seriously stout short. In the realm of stroker gen iii iv small blocks a 383 ci motor is a bit on the small side. Ls2 head 408 cid includes 4340 forged crank 4 000 stroke w 58 tooth reluctor wheel proh2k rods 6 125 c to c cp bullet series pistons cp7453b 4 030 bore x 27 5cc volume 9 1 1 w 64cc head.

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Best heads for ls 408 stroker.

However the gen iii block will use the ls2 ls3 cylinder head bolts. The ls6 was designed specifically by gm to surpass the ls1 as the best performance head and it did such a good job that the 243 casting was recycled on the ls2. Ls2 head 408 cid includes 4340 forged crank 4 000 stroke w 58 tooth reluctor wheel proh2k r. The gen iv block will be an ls2 ls3 style block that will use the ls2 ls3 lifter trays timing cover with cam position sensor valley cover etc.

In a comparison of the cammed 243 head and the cammed rectangle port ls3 head the ls3 torque peaks at 456 lb ft 4 800 rpm while the 243 head made at least that much torque from 3 500 rpm all. 408 lq9 budget engine build finance friendly 408 part 2 buttoning up our garage built ls stroker and heading to the dyno with hopes of unleashing 600 horsepower chris werner sep 1 2009. These blocks are commonly found in 2000 2006 gm full sized trucks vans and suvs. In its most potent form these heads supported a conservatively rated 405 hp on the z06 corvette.

The gen iii block will be similar to an ls1 ls6 block and will use all necessary ls1 covers gaskets and components. Proving that a well executed parts combination can sometimes overcome a displacement handicap this 383 produces horsepower and torque figures on par with those of many 408 and 427 ci stroker motors all while burning 91 octane pump gas. We started with a lq4 lq9 iron gm 6 0l block. We felt 408 cubic inches were necessary to achieve our customer s et goals.

For this build we selected the most commonly used block and stroke combination when it comes to ls engines the iron block 408. The test motor consisted of a 408 stroker equipped with a forged steel 4 00 inch stroker crank forged rods and dished pistons 10 cc from probe racing.