

For the boost systems, begin by checking the size of the intermediate boost valve by measuring the long, smaller land. 297", you very likely will not achieve a short, firm, tire chirping manual 1-2 shift.

297 inch valve and bushing is available from GM or your parts distributor under part number 8648959. Now check the land opposite the stem end of the TV boost valve. 433 inch valve is suitable for street and strip cars, trucks, Vettes, and IROC's. For big blocks or highly modified small blocks, use the. 422 inch boost valve and bushing is available under part number 8634941, the. IMPORTANT TECH NOTE: On most high-rev applications, an upshift to second can occur even though the selector is in manual one. 700r4 corvette servo instructions manual#Ģ97 inch setup will keep the unit in first with the selector in manual one right up to floating the valves, however, at moderately higher speed, the unit will go into first if the selector is pulled into manual one after an upshift to second or third gear.īe careful and thoughtfull here.

Given the right road conditions, this can cause loss of vehicle control. Installing a heavier pressure regulator valve spring only and ignoring these two boost systems could lead to sup standard performacne and many hours of rework so why not Fix It Right The First Time! 3-4 Clutch Pack Be sure to caution your customer! Having him or her sign a waiver or disclaimer ont he repair order might be a good idea. High performance, heavy duty and even light duty 700's have been known to experience premature 3-4 clutch failure or distress.
