Best Heads For 5 3 Lm7

We replaced the lm7 grind with a more performance oriented unit. Comp xr281hr 571 573 lift 228 230 duration split 112 lsa heads. The only differences between these heads and the ls1 besides the price are the valve size and combustion chamber.

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The most numerous garden variety gen iii 5 3 is rpo lm7.

Best heads for 5 3 lm7.

Test motor 3 wild lm7 5 3 liter block. A diminutive gen iii 5 3l ls can make north of 400 hp. Add pocket ported ls heads and gm s. Cylinder heads aluminum 195cc intake runner straight plug 2 020 1 600 in.

Best power per dollar for a 5 3 ls. Stock 4 8 liter flat top cam. To further improve the power these heads were treated to mild porting. Following directly in the engineering footprint of the ls1 casting these cylinder heads were used on the 4 8 and 5 3 liter truck engines.

I was going to switch to 243 heads and flattop pistons to bring the compression back up. We find out which factory ls head works best under boost in this back to back test of the 706 heads vs. Hi i m looking at putting in the tsp stage 4 5 3 cam 223 226 600 600 with all lifters springs and push rods as well as the ls2 timing chain. Trick flow specialties tfs 3051b001 c00 trick flow genx 205 cylinder heads for gm ls 4 8l 5 3l 5 7l vortec cylinder head genx 205 competition ported bare 58cc cnc chambers gm ls vortec each.

For air fuel i m going to do a ls6 intake with 36psi injectors. Tfs genx 205. Valves chevy small block pair. In stock trim the 706 castings have been shown to be the most powerful factory head available for the small bore 5 3l.

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