1) Its a cheap way to have a VTEC motor, thats what it was always about. LS blocks are $100. GSR blocks are $500-700. For the guys back in the day with LS motors, instead of buying a complete new longblock, you could just buy a head.Originally Posted by KingElli
2) LS block has a 89mm Stroke vs the GSR 87mm stroke. B20 block has 84mm bore compared to the GSR/B16/LS bore of 81mm. more stroke=more HP/TQ, bigger bore= more HP and TQ
3) LS/VTEC or B20 VTECs are cheaper to build and make decent power.
4) STOCK LS VTECS make about the same numbers as a GSR. hey are around 145-155whp depending on whether you use the b16 or GSR head. B20vtecs make around 155-160whp, but they make 7-10 more ft/lbs of TQ.
CONS:
1) not as reliable as a VTEC block. Vtec motors were made to rev high. they have stronger,thicker rods. They have oil squirters, they have shorter strokes. they have stronger rod bolts, better bearing designs. a better water pump.
2)LS/B20 Blocks do not have girdles and other things vtec blcoks have. GSR blocks have Girdles across the mains to help stabilize the crank at high rpms. the b16 has such a short stroke it doesnt need a girdle. The GSR rods also use a rod bearing that is 2mm more narrow for better oil distribution to the rods at high rpms.
3) LS heads flow like crap. they use a 31mm valve compared to the 33mm Vtec valves. the heads also have much more narrow valve throats than the vtec heads.
STOCK,STOCK,STOCK LS VTEC WILL MAKE MORE POWER THAN A STOCK LS. about 15whp more. Vtec heads breath MUCH better than a LS head, and they let you rev a little higher. on a stock LS bottom end i would not rev above 8000rpms.
if you are on a budget it is worth it. if you have money to spend, i would almost always reccomend a vtec block over a non vtec if you are staying stock internals. i know for a fact that STOCK GSR blocks can handle 9000rpms and b16s can handle 9500rpms. LS bottoms cannot
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