Hey everyone!
We are now building a Magnum stroker 408 for my daughters '71 Demon. She, like many others, is a kid with a small pocket book so we are doing the best we can for her. This will be a street/show car. I really doubt there will be much time at a track for this. Not sure why she has to have a street beast cause it makes me nervous!
Work has begun at our machine shop (great guy who is helping us out).
We have the Scat 408 stroker kit, valve relief .030 pistons, 11:1 compression.
She insists on running an after market EFI (this was the trade since I didn't want to do a hemi swap). Not sure which EFI kit yet but something. We (engine builder and I) spent some time on the phone with Comp Cam and they are grinding a custom cam for her: 224/536 Intake, 230/544 Exhaust with a 112 + 4 centerline. They said this should work well with any aftermarket EFI and maintain street ability.
The heads at this point are still going to be the PIE cast Magnum heads, stock lifters and rockers. I've been researching how much lift the stock rockers can safely accommodate, here's the info from the Magnum Swap site: "Important note 2: There is a persistent rumor that the Magnum engine will not tolerate camshafts with higher than .520 lift due to retainer/lock to valve guide clearance issues. This is not true. While max lift is related to cam duration and other factors, we are using a .550+ lift cam in our shop car, did not need to flycut the pistons, and have more than the minimum clearance."
We originally planned on running 1.6 adjustable Chevy rockers but the more I dug into it, it looks like a bunch of work. Not just putting some studs in the head but actually drilling the head and relocating the studs. Otherwise the geometry is out of wack. Unless there is some new products out there, not sure? So for cost savings, we are not planning on going down that road. Unless of course she had more money and could just get the Trick Flow heads that are setup for that, but that is not an option at this point.
Now, we plan on checking for clearance once this is all together.
But I was curious as to what others have run for cams, similar to what we are running, with the stock Magnum lifters & rockers? How did it work out? Issues?
Thanks
Bill
We are now building a Magnum stroker 408 for my daughters '71 Demon. She, like many others, is a kid with a small pocket book so we are doing the best we can for her. This will be a street/show car. I really doubt there will be much time at a track for this. Not sure why she has to have a street beast cause it makes me nervous!
Work has begun at our machine shop (great guy who is helping us out).
We have the Scat 408 stroker kit, valve relief .030 pistons, 11:1 compression.
She insists on running an after market EFI (this was the trade since I didn't want to do a hemi swap). Not sure which EFI kit yet but something. We (engine builder and I) spent some time on the phone with Comp Cam and they are grinding a custom cam for her: 224/536 Intake, 230/544 Exhaust with a 112 + 4 centerline. They said this should work well with any aftermarket EFI and maintain street ability.
The heads at this point are still going to be the PIE cast Magnum heads, stock lifters and rockers. I've been researching how much lift the stock rockers can safely accommodate, here's the info from the Magnum Swap site: "Important note 2: There is a persistent rumor that the Magnum engine will not tolerate camshafts with higher than .520 lift due to retainer/lock to valve guide clearance issues. This is not true. While max lift is related to cam duration and other factors, we are using a .550+ lift cam in our shop car, did not need to flycut the pistons, and have more than the minimum clearance."
We originally planned on running 1.6 adjustable Chevy rockers but the more I dug into it, it looks like a bunch of work. Not just putting some studs in the head but actually drilling the head and relocating the studs. Otherwise the geometry is out of wack. Unless there is some new products out there, not sure? So for cost savings, we are not planning on going down that road. Unless of course she had more money and could just get the Trick Flow heads that are setup for that, but that is not an option at this point.
Now, we plan on checking for clearance once this is all together.
But I was curious as to what others have run for cams, similar to what we are running, with the stock Magnum lifters & rockers? How did it work out? Issues?
Thanks
Bill
