Hello. Just completed rebuild on 17056228 large primary bore and mods using recipe #1.
Used Cliffs S/R kit + 2ndary spring and cam kit, rebushed primarys, Small notches in 2ndary flaps for Poe. Bushed main air bleeds to .070 airhorn and body from .120
Idle tubes .036
Channel restrictions replaced to .047, previous .055. Slightly larger than recipe calls for but thats the size the replacements were, driven in slightly below main bleeds
Upper Idle bleeds .069, lowers .076
Bypass air .080, Acc pump disc holes .026
Poe Wells .039, Poe Discharge holes .052, 2ndary bleed tubes .036
Green power piston spring, 1/4 float level
Cliffs 44 Primary rods, 72 jets, K hanger and CH rods. Pulloff at 2 seconds.
Mix holes .089
On first start up after warm up Idled slightly ruff (Choke completely off). Had to adjust mixture out 5 + turns min to get 14hg and a better idle, peformed Tip In (2000rpm) and had to adjust ADP up 5 turns to get slight rpm increase, after 5 1/2 to six turns no increase and less than 5 turns out get larger increase. Do not get rpm increase when removing small vac line.
Idles at 700, 650 in drive. Has a slight stumble off idle with light or hard throttle input, Acc pump shot is immediate and strong. Exhaust stinks, Runs strong otherwise, no hesitation at cruise, smooth transition to secondarys with a slight bog when open with spring at 3/4 turn. Had to put truck away and go to work.
Note: If ADP is less than 4 turns out will get lean pop when snapping throttle.
Idle is just slightly rough and stinks bad. Power piston is down at idle and 2ndarys closed tight. No apparent vac leaks.
Suggestions? Larger jets?
Thanks Craig
74 Blazer 355, 292 adv 214@50 449 lift, 111 lsa. Performer intake, stock 882 heads, flat top pistons.
Headers and dual exhaust 2 1/4. 2000 stall, 4:10 gears 35" tires. Timing 10 initial. stock vac adv can, Hei distributor