C70 into 850T valve swap

lumberjackzac · Post by **lumberjackzac** » 02 Nov 2011, 20:02

Greetings,

I've been planning and waiting on this engine swap project for about a year. A nice price has come by and I understand that some of the 98 C/S70's have variable valve timing, VVT. My question is simple and refined.

If you swap the valve-train from an '96 850 turbo b5234T5 (bad compression) to a 98' C70 B5234T4 /T5 /T3 you should basically have an engine that will run on the 850's ECU no problems? Right?

Or is this madness?

Post by **Ozark Lee** » 02 Nov 2011, 20:40

The valves are all the same between the two. You might get into trouble if you try to just swap the heads if one has CVVT and the other one doesn't - I'm not sure. The original cam sprockets are a must since they have different timing marks and the exhaust cam sprocket is a totally different animal. The 850 ECU should deal with it just fine but the inverse (850 valve train into a CVVT car) will be grief forever.

When I get back home I can look some stuff up for you on VADIS to try to figure out campatability on the head and the cam cover but that will be Saturday at least.

...Lee

h20ham · Post by **h20ham** » 24 Jul 2014, 22:17

Anyone know if the cvvt head fits. How bout the cams?
Thanks!