I am in the process of getting parts together for my engine build... I am planning on building a 625-650 Horse 500 EFI. I will be using a 540 kit and most likely Dart Pro 1 or Iron eagle heads. I see kits around (like Ateco) that have the heads and cam kit all in one. Can I use these cams with my EMI Thunder manifolds with the long risers??? Thanks, jeff

Call RMbilder for your cam and valvetrain. Hundreds of guys on here have used him. I just gained 5 MPH just from his cam setup. I allready had a built 489 stroker engine. I switched from a flat tappet to Hyd Roller. Check out my post "Roller Cam Upgrade".

What kind of boat do you have? Is it a 236 Baja?

List the cam specs.

Hey Jeff,
I checked out there site and the different packages they offer. I noticed that the exhaust duration is getting up there however not sure what the lobe sep is. They don't list that. I would think if you asked them that they would know what your up against and have an answer. Do EMI's have the higher risers simular to that of gils (anti reversion)?

I have the EMI's with the long(high) risers. Thanks, Jeff

They don't have high risers but they do have long anti reversion risers. low profile.