That is the cheapest option so far, thanks. I looked back through my book of info on the engine rebuild and my piston to valve clearance is .175 intake and 1.50 exhaust. I'll go back and recheck before installing this cam or any other. Thanks everyone.
The most significant difference will be seen if the heads have been worked enough to take advantage of the higher lift the 308S offers. Devon
By far the biggest factor in camshafts, in relation to power production, is intake duration. The more intake duration, the more power it makes. But cams are always a compromise.. unless your building an all out race motor. the 308S is a very versatile camshaft, and with your converter and gearing, and having one in house, that's the cam I would run. I have made 625HP in a STG 2 SE headed motor, at 10.5-1 compression. To successfully run this cam you need: Roller rockers At least 10.5-1 compression at least a 3500 stall converter At least 3.90 gears. The more airflow (heads, intake, carb, exhaust), compression, gearing and converter you have, the more power it will make, and the faster the car will be. Northcorner, If you can clear the lift, the extra 20 some degrees of intake duration will certainly make more power. If it's enough to get you into the 10's I can't say, simply too many other factors. While you may hear different claims from others, my experience with the 308 is that it makes roughtly 5" of vacuum at about a 900 rpm idle. This is half of what it takes to run the power brake booster effectively, under all conditions. JW
Jim, while we are on this subject, I would like to get your idea on a racecar cam. It would be race only, 3300#, 400 trans, 5000 convertor, footbrake, 4.10 gears with 31", 10.5W tires. Stage 2 SE heads that have been seriously worked. 12.5 compression and 2 -750 or 800 carburetors. The only concern I have is not to get something that will break lifter bosses or eat valve springs. I know most of the interest here is to drive like a stocker on the street and run like a Pro Stocker on the strip. I realize that is impossible, I just want to race. Thanks, Jim Netherland
I'm very familiar with that build. What do you think the results would be if the same motor had the 304s cam?
We made 650hp with a 30 year old KB cam and iron heads, but I think there is better technology out there now. JIM N>
Jim, I think you would like a TA 508S in that combo. I built a 494 with one a few years ago for a super gas car.. made 710 on the dyno. You will be limited by your intake manifold. That motor has had no durablity problems with that cam. It's in an opel GT that runs in the mid 8's full out. Throttle stops it and he runs 9.90's at about 152MPH.. JW
I would say you won't see a lot of difference. I recently put a 304S in a well worked over 464, 10.8 compression, STG 2 SE ported ect.. that one made 650 something HP... so I wouldn't worry about the exhaust duration difference on this type of engine. JW
Thanks for the reply. I will take a look at the TA 508s. I know I run a 1969 intake, but it is not as bad as you would think with the work that has been done to it and the spacers I use. Thanks JIM N.
Thanks for all the great info. It is too late for me to change cams now and will try that after the Nats.
