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Needed more torque. Summit Racing gave me a suggestion. Was it a good 1?
I have a 68 Impala with a 350 engine out of a 71 base Camero. 4 Bolt main with a 750 holley avenger carb and a TH350 Transmission. Car originally had a 327 in there and has a 10 bolt rear. The engine was rebuilt with a Budget Rebuild Kit from Summit racing about 20k miles ago.
Its kinda slow off the line but instead of stroking the engine, I wanted to do some simple changes to gain more torque. It has a Summit cam in (SUM-K1102) and now they told me to put a bigger cam (SUM-K1103) and a B&M 2500 Stall Torque Converter for a better jump off the line (I'm not racing the car but want it to show better when the light turn green)
Was Summit right? If not, what's your suggestions?
Well for the biggest gain of that off the line power it will gonna come from rear end gear ratio and torque converter stall speed
What's your gear now? I would recommend a 3.42, 3.73 or 4.10.
A 2.54, 2.73, 3.08 gears will always be slow starting off unless your making 700 ft lbs of torque lol
The stall speed needs to match the cam
With your cam now a 2200-2400 stall would be great.. With the K1103 you would need alittle more.. Like a 2600 stall speed
Now the budget rebuild kit gives you 9.35:1 compression with 64cc heads..
What heads are you running? If stock GM heads get the casting number and let me know.
The chamber cc will lower or raise compression ratio
Cam and compression has to match each other or you will end up with an over camm'ed engine that has very poor low RPM power.. Or an engine that pings it's self to death.
If you have a true 9.35:1 then the K1102 is about right for your engine..
I would want atleast 9.5:1 before I step up to the K1103
I'm running 10.18:1 compression with a crane 272-2 cam (216/228@.050")
Now if you want to pull the heads and put on a thinner head gasket (fel pro 7733SH1 or 1094) which is 4.100" bore x .015" thickness that will bump up yyour compression, lower your quench height, and make more power, plus let you use a bigger cam like the k1103
Now that gasket is only to be used if you aint had the block 0 decked
The 750 carb is hurting you more than helping you.. That big of carb on a mild engine is killing some throttle responce.. A 600 or 650 would be the best
What intake are you running?.. I would recommend the performer RPM, or RPM air gap
What's your tuning specs? Dailing an engine in can make a world of diff.. I know that 750 carb is jetted too rich out of the box for your engine.. I would jet it down a few sizes.
Timing? If the heads are the old 71 350 heads they will make more power with more total timing.. About 38* total timing (thats about 17-19* BTDC at idle with vac advance line un hooked)
Hows the advance curve in your dist? If stock then your timing aint fully advancing untill around 4500 rpm.. Buy a $6 re curve kit and add the light and med spring to your dist., but keep stock weight.. This should bring full timing in at 3,000 to 3200 rpm (where you want it)
No need in stroking the engine to get the power your wanting.. I have a 355 engine in my camaro with the mentioned cam along with the summit budget kit, and running 11.40's @ 118 in the 1/4, 1.60's 60' times and 0-60 mph in 3.2 seconds. Now my engine has more work done to it than yours but still 3.48" stock stroke
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