Mudd Duk
OBS Enthusiast
Got some questions regarding the build I'm currently in the process of doing on my 1990 5.7. The block has been bored over 0.060 with an Eagle crank thats been turned and polished, a Bullet cam (205 and 215), and it's got Keith Black flat top pistons. The heads currently are stock, but have Comp Cams Magnum Roller Rockers, 1.6 ratio. It's got an Edelbrock performer intake for carbureted engines, the truck was and still is FI, so that I could install the Holley Pro Commander 950 4 barrell throttle body with 65 lb/hr injectors. The motor is topped off with a K&N 14" filter. The 700r4 trans was rebuilt with better steels, bands, etc. It does have a corvette servo and a B&M external cooler. The converter is new, but I'm pretty sure it's close to oe stall, 1650 or so. It's a GM18A. Since I'm running the Holley Pro Commander, I had to put a B&M torque coverter lockup controller in it so the trans will still shift into 3 and 4. The truck has been regeared to 4.56 and has a spool in the rear. My questions are:
1. I'm going to run a larger cam. I will buy new lifters and pushrods to match. Can I go with a roller cam if I get roller lifters, or does converting my engine to roller consist of alot of more machine work? Truthfully, I'm not sure if the cam in there currently is flat tappet or roller. Basically, can I buy a roller cam and lifters, and they just slide in, or do I need to stick with the flat tappet (if thats what the truck was originally)?
2. I will put better heads on the block. I believe that the aluminum GM performance vortecs are the best for this build, having 62cc chambers and 210 intake runners. Am i wrong? Also, can I run my 1.6 roller rockers on this head?
3. The cam I was looking at was a Comp Cam Extreme Fuel Injection cam but heard that the cam isn't big enough to get the most from those heads. Suggestions on the right cam? I would like to go with that same brand and series, what one provides enough lift to get the most from those heads, but still mantain streetability and the use of my accessories.
Keep in mind that, since the trans was just built, I won't be using a different converter for this build. I believe that some cams require a larger stall in order to work right. I also want to use the 1.6 rockers I already have in this build too. I know the Comp Cams extreme FI cams allow the use of these rockers.
Thanks for any and all help.
1. I'm going to run a larger cam. I will buy new lifters and pushrods to match. Can I go with a roller cam if I get roller lifters, or does converting my engine to roller consist of alot of more machine work? Truthfully, I'm not sure if the cam in there currently is flat tappet or roller. Basically, can I buy a roller cam and lifters, and they just slide in, or do I need to stick with the flat tappet (if thats what the truck was originally)?
2. I will put better heads on the block. I believe that the aluminum GM performance vortecs are the best for this build, having 62cc chambers and 210 intake runners. Am i wrong? Also, can I run my 1.6 roller rockers on this head?
3. The cam I was looking at was a Comp Cam Extreme Fuel Injection cam but heard that the cam isn't big enough to get the most from those heads. Suggestions on the right cam? I would like to go with that same brand and series, what one provides enough lift to get the most from those heads, but still mantain streetability and the use of my accessories.
Keep in mind that, since the trans was just built, I won't be using a different converter for this build. I believe that some cams require a larger stall in order to work right. I also want to use the 1.6 rockers I already have in this build too. I know the Comp Cams extreme FI cams allow the use of these rockers.
Thanks for any and all help.