I have the 462 I built out of my truck and on the engine stand, awaiting it's new home in my skylark this spring. Now that meeting emissions requirements aren't an issue, I am going to be removing the 1976 EGR intake manifold, and dropping the exhaust manifolds in favor of a set of MT super scavengers I have sitting in the garage. I would also like to try my hand at some light porting work. There is some casting flash and such in the ports that can be removed, and I would like to gasket match the heads to the intake. My question on this is, do I need to get rid of the valley pan stamped steel gasket, and use composite gaskets to do this? As far as a non-emissions intake, I don't have one yet, I am undecided whether or not I should go with a performer/B4B or a single plane like the SP1 or SPX. My engine combo is relatively mild, 9:1, 220/235 @.050 .473"/.476" 112 LSA cam... Heads are small valve '72s. My eventual plans would be to deck the block to get zero deck hieght, and a set of either alum. stg 1 heads or Bulldog heads, and a cam to match. The decked block and smaller chamber heads would yield approx 10.25:1 compression. Would the single plane intake really hurt my low end TQ that much? I'd hate to get an dual plane now, only to have to step up to a better intake in a few years.
i think gears are the main factor, if you have 3.55 gears or lower then go with the SP1, if 3.55 or higher go with a dual plane, because you wont be in the rpm range of the SP1 enough to take good advantage of it.
I have 4.10 gears in my skylark. I don't plan to go over 6000 RPM though, as I'm running hypereutectic pistons. I was under the impression that high RPMs and hypers aren't a good combination.
Scott, considering the direction you are headed, I would say the SP-1 would be a better choice than the performer. The performer will make a little more power under 3000 rpm, the sp-1 will make more power from around 3500 up. Jim Burek
I run hypers and shift at 6000, also run a SP1, and have about 520 H/P, its detonation that is the hardest on hypers and i wouldnt use them past about 550 H/P. RPM'S shouldnt matter with the hypers as long as the rotating assembly is in good shape, and is set up for the rpms, your rods are the weak point, you should have at least ARP bolts, and have them peened, along with at least 60 psi hot oil pressure at 6000 rpm, with the 4.10 gears you should go with the SP1, because with those gears your only low end will be at idle, i have 373's and am always spinning over 2500 rpms.
