Originally Posted by fast68plymouth
There was a late 80’s vintage BBC LS6 crate engine on the dyno here the other day.
It was a pretty low use piece that had just been freshened. Cylinders honed, rings & bearings, valve job, new springs, and a comp 282S magnum sft cam.
10.2cr, pump gas, Holley 650DP carb.
Runs manifolds in the car.
Motor was tested with the manifolds and some 1-3/4x3 headers.

Manifolds - 471tq@3600/438hp@5500
Headers - 523tq@3700/463@5600......... better by 52tq/25hp(peak vs peak).

The pulls were started at 3000, where the tq numbers were 448 for the manifolds and 504 for the headers.


It seems strange to hear 80's Vintage Ls 6 crate, I had one in my OLD 72 SS Chevelle LOL, DAMN I am OLD HAHA , where did the years go ??

1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5