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Pampered-Z · 08-14-2006, 08:05 AM

I've done a few, just installed a GM847 cam in a friends car 3 weeks ago. The link below will give you an idea of all that you'll need. And also the pitfalls you might run into with a big cam and stock heads!!!

http://www.97transam.com/97ta-cam.php

Yes, porting the heads will help allot, Having the heads machined to accept different springs is also good as you can run a double spring with a higher install height so your not as limited on spring selection or spring pressures.

Porting the intake doesn't do that much unless your making in the 400HP range then enlarging the the throttle bode holes to accept a 58MM TB can be done. Porting the runners on the intake has little value as the plenum size will then be the restriction, so basically, don't bother wasting money of porting the entire intake.

You need to pull the front end of the engine as well as the fans and radiator ( AC can be left in if your careful! you need someone to help and pivot out of the way) and intake has too come off. Water pump and Opti come off so it's a good time to replace them.

If you do a true double roller you'll need to change to an electric water pump and clearance the timing cover since a normal D.R. will not drive the WP and will make contact with the cover. A good option is the LT4 HD set-up, but it is more $$.

You will need some special tools: Fuel line disconnect tool. 3 finger puller to get the belt pulley off the hub ( the 2 finger one doesn't work very well as it will "pinch" the pulley on the hub. ) You’ll need a hub puller and you'll need to fabricate some bolts so you don't damage the crank threads. I have the above tools if no one local has them.

For the valve train you'll need the tools for that, air chuck to hold the valves up and a screw type spring compressor ( Bar type won't work in the LT1 engine bay!, and a spring install height gauge. ( If you get the heads ported, have them assemble the heads and save yourself the trouble!

You should change to hardened pushrods, depending on cam size it could determine the springs keepers, rocker arms and pushrods/ guide plates you might need.

I have a good write up on doing a cam swap, but it's hard copy. I can either scan it and send it or give you a copy at the Nat's this weekend?

Let me know when you’re doing the can, maybe I can give you a hand?

John

08-14-2006, 08:05 AM	#5
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	I've done a few, just installed a GM847 cam in a friends car 3 weeks ago. The link below will give you an idea of all that you'll need. And also the pitfalls you might run into with a big cam and stock heads!!! http://www.97transam.com/97ta-cam.php Yes, porting the heads will help allot, Having the heads machined to accept different springs is also good as you can run a double spring with a higher install height so your not as limited on spring selection or spring pressures. Porting the intake doesn't do that much unless your making in the 400HP range then enlarging the the throttle bode holes to accept a 58MM TB can be done. Porting the runners on the intake has little value as the plenum size will then be the restriction, so basically, don't bother wasting money of porting the entire intake. You need to pull the front end of the engine as well as the fans and radiator ( AC can be left in if your careful! you need someone to help and pivot out of the way) and intake has too come off. Water pump and Opti come off so it's a good time to replace them. If you do a true double roller you'll need to change to an electric water pump and clearance the timing cover since a normal D.R. will not drive the WP and will make contact with the cover. A good option is the LT4 HD set-up, but it is more $$. You will need some special tools: Fuel line disconnect tool. 3 finger puller to get the belt pulley off the hub ( the 2 finger one doesn't work very well as it will "pinch" the pulley on the hub. ) You’ll need a hub puller and you'll need to fabricate some bolts so you don't damage the crank threads. I have the above tools if no one local has them. For the valve train you'll need the tools for that, air chuck to hold the valves up and a screw type spring compressor ( Bar type won't work in the LT1 engine bay!, and a spring install height gauge. ( If you get the heads ported, have them assemble the heads and save yourself the trouble! You should change to hardened pushrods, depending on cam size it could determine the springs keepers, rocker arms and pushrods/ guide plates you might need. I have a good write up on doing a cam swap, but it's hard copy. I can either scan it and send it or give you a copy at the Nat's this weekend? Let me know when you’re doing the can, maybe I can give you a hand? John __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!! Last edited by Pampered-Z; 08-14-2006 at 08:20 AM.