318 build

Yea and I was too when I wrote it. I see some questions now just didnt at the time, just thought he was telling us about his combo.

One thing about Magnum heads and their parts is the limit on cam lift. The guide to retainer clearance limits the cam lift to .530 ish. If you go over it will hit and cause major problems. So unless you send the heads out to get guides machined down, you would have to limit the lift. Also, some cam companys only list their products with 1.5 ratio rockers, however the magnums are 1.6, so you have to take that into consideration. For example a cam lift of .490 with 1.5 rocker arms would be roughly .522 lift with the magnums 1.6 rockers.

As to the rings, I wouldnt really go with file fit for the simple fact I am not a nitrous guy and know just a little bit about it. I will know more once I start on my friends 318 but that wont be for a couple weeks to even months. But anyways I digress, I would use the rings you have and limit the jet setting to 100, no more then 125 though.

A few notes in my opinion is this would be a killer combo if you got the correct machine work done to it and blueprinted every aspect of it. Like I said before I am not a nitrous guy and just started on researching some ideas once I found my friend a car. But this could be a very streetable combo while also being a very race ready combo.

One thing to look at is the pistons, what would your final compression ratio be once you lets say square deck the block and heads and such. One thing I do know is depending on camshaft selection a good ratio to limit the compression is 8.5 to 1 with 9.5 being the max.