OK HP Lovers, Here is my present Stage 1 combo. If I change to a roller camshaft how much of HP can be gained? Cubic Inch 464 Comp. 14:1 Cam Poston c-108 Duration Intake 268 Exh 271 Lift Int .602 Exh .597 LCA 108 Heads Stage 1 with 1.72 Exhaust Valve 2.13 Intake Valve Flow Lift .100 .200 .300 .400 .500 .600 Int 68 155 229 271 277 277 Exh 60 115 150 185 192 192 I:E ratio 88% 74% 65% 68% 69% 68% Intake Manifold KB Wildcat Carb 1050 Dominator This engine pushed our 3400 lbs car into the 10.40s. We shifted at 6200 rpms and went through the traps at 6400. This is the engine I will be using to compete with the Fastest Stage 1 guys so it will be going into a 2800 lbs chassis car. That would put me around 9.80s so I need to MORE HP to get into the 9.50s. I have two different cams that I can use. Roller 1 Int. Exh Lift .627 .620 Dur @.050 276 282 LCA 108 Roller 2 Lift .621 .620 Dur@.050 274 284 LCA 110 With this information could the HorsePower experts give me some advice. Thanks
Roller? I think theres definitely more power in a roller. BUT getting it set up in a 455 is a problem. The rocker arms don't clear the roller springs. I had to relief cut the the retainer area and spring area on the rockers. I've heard of rockers breaking, springs breaking and even valves dropping if you don't get the rockers completely clear of the spring, but by the time you got enough clearance the rockers are thin. I also had to sink the spring pocket and the valve seat to get the right installation height. On a stage 1 head you could probably just sink the spring pocket especially since you dont require hard retainer plates below the springs. My 1.70 rockers held up for 32 runs down the 1/8 mi. but there were still areas where the spring was hitting when the engine was running. There was also chatter marks under the shaft on the mount showning that the grade 8 studs weren't keeping the shaft under control and there was a good amount of flexing going on.-Giving up the extra lift and duration I was getting from the roller, and putting bad harmonics in the valve train. In my opinion, if you can't afford the "Jessel" style T&D rockers I would stick with the flat tappets. Maybe Chilenski or Massoud have the anwser or found a spring from someone that will work and clear, preferrably a H-11 or vasco jet material type. I used a Lunati 74500 spring. You would still have some shaft flex to deal with. Of course, don't forget to put the plates or girdle in the lifter galley. I know you asked " how much power" but depending on what you do in the set up, you could make from 0-60 hp. I would keep custom grinding flat tappets to find the magical grind then convert it to a roller to see if you actually picked up anything. The roller swap, even if you've already got a couple of cams, is retainers, locks, springs, liftes, and machine work = @ $950.00. Thats alot of custom ground flat tappets. The right flat tappet will out run the wrong roller. I just have infomation on "my opinion" going off of what I went through. Its you motor, your money. - you decide but I hope I gave you some useful info. By the way, I just went through $1600 to get "Jessel" style T&D's on my Stg.3's. NOS is much cheaper and faster. I say put the JUICE to it!!! If you can put the motor in a gutted out car why can't you add NOS? It will still be a Stage 1 motor right? Everone always gripes about the fastest car whether its back-half'd or super lite or whatever. So just spray it! Let them gripe about catching up. :Brow: FLYIN' oN tHE JUICE!!!:stmad: :stmad: :stmad:
Hi John, I haven't met you yet but I will, with your involvement in the Nationals and my GSE class involvement. Anyway, just info being past on here to you. Most of the GSE guys have pulled the roller cams out. Too much in the way of trying to keep the motors together. For comparison purposes only, my car (which does have the Stage 2 heads) GS Street Eliminator trim, through the mufflers, weighs in at 3810 lbs... went a best of 10.53@129.50 with a roller cam, 60lbs. of oil pressure measured at the back of the block. Changed to a 308S cam, modified my suspension a little and the car went a 10.25@129.85 with oil pressure I actually had to regulate. There are a few GSE guys running quicker then that with Solid grinds. I personally won't go back to a roller and a few other's I know won't either. Just my thoughts, probably makes things worse for you!
