[impactbumper]

Originally Posted by Fly911

I'm in the process of rebuilding my '87 Carrera 3.2L, and got a new 997 GT3 crank and oil pump (from William Knight), new 997 GT3 3.8L Pankl Ti pistons (130mm), 997 GT3 Cup intermediate shaft (slightly used), and 102mm P/C set from LNE. The pistons are custom made for the longer crank and rods. I'm changing the rod bolts to stronger ARP bolts, due to heavier pistons than the GT3. I got a set of "crazy" cams from Elgin, with 325 degrees inlet and 318 degrees exhaust with high (cant remember on top of my head) lift. My worry is that there might be a too tight clearance between pistons and valves... My engine builder did the math, and figured out it should be OK. However, he wants to assemble the engine and measure the valve to piston gap (and compression), and then machine out bigger valve pockets if necessary. However, if the pistons and valves collide, and there is not enough material in the pistons to be machined, would it be possible to put spacer rings on the cylinders (on the case side or the head side) to increase the gap?

would love to see this build

Originally Posted by Canada Kev

I wonder how much it might lower the compression ratio machining out the pistons like that?

Fly, that sounds like it's gonna be a pretty big engine for a 3.2 case! Keep us in the loop on how it turns out.

yes

Originally Posted by sp_cs

Invaluable input here chaps. First stage complete - 997gt3 crank (99610202196) has arrived at the engine builders, and rods are on order.

more details, i am doing ground work on this also, prepping for winter project.

Originally Posted by racing97

The Engine in the data was 3.4 ltr and made 347 hp at 8,000 it was for all intents and purposes is a slide valve RSR the 3.8's I have had experience with were Factory rsr's with Plenium and the best made 380 with various modifications but essentially a different cam then Elgin.

regards

impressive from a 3.4