I may have enough time before BG to change my cam for a better ET, but which one? The car in question is in "alan"s avatar. It was running 7.39 to 7.42 in the 1/8 mile. I switched to TA aluminum stage 1 SE heads ported by myself, roller rockers at 1.64 ratio and went from an 850 to an 1150 Dominator which is still very streetable. Went to the track last night with a noticeable more power but I was expecting too much. I wanted some 6.90's for the 1/8 and 10.90's for the 1/4, but got a 7.13 at 96 mph and 11.27 at 118mph for the 1/4. At least the front tires are coming off the ground some. The short block is about 16 years old. 10.5 compression with the old Sealed Power forged pistons, balanced and ARP bolts with stock oil system. The cam is still the original 107 "window rattler"! I need a more modern cam in hopes of those 10.90's. What is your chooice? I have a 308S cam which was not purchased for this engine but may work. Also I have a Reed cam with specs of .523 intake .536 exhaust and duration of 236 I and 244 E. This is my first choice. It should have more power and still be streetable. I have looked at the TA catalog for more choices. What do y'all think of the TA 296-08H (recommended by Tim at TA) lift is .535I and .520E and duration of 243I and 247E. Another choice is the TA510 with lift of .576 intake and exhaust and duration of 255I and 265E. I have a 3500 stall converter in a T400 with a 410 gear and tons of rubber under the back, so traction is no problem,I just need to go faster and get the front wheels in the air about a foot! What is your choice?
Idles around 850-900 in gear, high stall. Drives around like a cream puff unless you grab high stall and mash the pedal. Then all hell breaks loose. Devon
I'll second that emotion :TU: :TU: My car is unbelievably streetable. The idle is pure race. The only cons are is if you had a manual trans or a lockup converter, it will buck under 2000 RPM and vacuum is minimal for power brakes. I have power brakes and they work great but some people need to use a vacuum pump or canister. The other con, or pro depending on your viewpoint, is that everyone, even people that don't know jack, knows there's something sinister lurking under the hood when they hear the idle. Here's a thread I started on the subject...308s thread
The 308S is awesome. I've been running it on the street for years with no problems. Very streetable and plenty of power.
What compression do you have? I talked to Mike at TA and he suggested the 296-08H or the 284-86F solid cam. Choices, choices!
I've been using uncut 100LL Aviation fuel in the car for the past few years. The engine seems to love it.
I add some avgas to my 93 octane when I go to the track and I only have 10.5-1 compression. Avgas here is $5.29 a gallon!
Get a cam made with cylinders 1 and 6 the 308s grind, cylinders 8 and 5 the 296-08H grind, cylinders 4 and 7 the 284-86F grind, and cylinders 3 and 2 the old 107 grind! That ought to cover it all! :laugh: :error:
Jimmy I have the 296-08H cam and really like it in a manaual trans, manual brake application. Idles at 800RPM all day long, and is very streetable in my combo.
Put in the 308S Check valvespring pressures, retainer to guide clearance and piston to valve clearance. You will need all that extra duration to get into the 10's. JW
Is the 308s the best option for more power over the 107? Just curious. I have an old (version) 107 cam with iron heads. Best so far is 6.97 1/8 mile and 11.09 1/4 mile at 118 mph. I built the engine around the 107, but really looking to step up a bit. I've gone with solid lifters with a new "old" 107 cam (I'm valve lift limited), and 1.65 roller rockers. I'm really wanting that 10.9X with this "old school" set up. I haven't been able to put the new cam, lifters, and rockers on the track yet, but hoping for a solid .10 sec. improvement. So, back to the question, is the 308s the best improvement over the old 107?
