The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 1986 block, 1987 heads- CAM HELP

**THI** · 06-01-2020, 04:55 PM

The stock TBI cam is really small - around 179* intake duration @ .050" lift. The old 193* intake/202* exhaust cam used in the 307-400 small blocks is a big improvement and would work with the valve springs. The TBI heads are poor flowing heads so going too big on a cam would not work well. Many have had good luck with an RV cam (204*/214*)

06-01-2020, 04:55 PM	#2
THI Active Member Join Date: Jan 2017 Location: Traverse City, MI Posts: 169	Re: 1986 block, 1987 heads- CAM HELP The stock TBI cam is really small - around 179* intake duration @ .050" lift. The old 193* intake/202* exhaust cam used in the 307-400 small blocks is a big improvement and would work with the valve springs. The TBI heads are poor flowing heads so going too big on a cam would not work well. Many have had good luck with an RV cam (204/214)