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Discussion in 'Engine Topic' started by ddc456, Dec 6, 2011.
My brother in law has about that same set ip with a 750vs holley 3310 on his
^yup. I run a pair of 660 center squirters on a tunnel ram
Okay.....I'll split the difference. Run a 700!
It takes a well prep'd 350 to truly need a 750 DP. I'm assuming your 2.02 heads are older iron ones which don't flow like todays heads. That's not a really big cam. The problem with guys that do run 750s (holley) on a 350 and says they run well have probably never tried an 650 or so on there. Once the motor cleans itself out in the upper rpms they really feel this surge in "power". Problem with most street engines is we don't stay at 5,500-6,000 in RPM. You have a slight delay in the startup of the main circuit with a 650 due to the straight leg booster being positioned a little higher in the venturi. That makes it a little more forgiving carb down low. That combined with the slightly smaller venturi gives you a better streetable throttle response. I have ran both a 750 DP and a 650DP on my 454 BBC. The 650 on MY combo flat runs quicker and better. I also have you by 100 cubic inches though the R's are down a bit. Bottom line is the hardest thing to ever convince a guy of is that he will need less cfm than he THINKS he needs.
Just remember the massive power these restricted classes make with a 390 double pumper and a 500 2 barrel.
A vacuum secondary carb will be more forgiving if you buy larger than your engine really needs. From the info given, I would say something like a 650 (maybe the 670 Street Avenger) would be a better choice than the 750.
If the car is mostly street driven, you would be better off with the vacuum secondary carb than the double pumper. You have the manual trans, but if your rear gears are not large enough (numerically -- 3.42 or 3.73 for instance) the double pumper will be less responsive and use more gas. Good luck.
.480" 230º cam is a flat tappet cam, Comp HE280 cam (and many others).
The 650 is MORE than plenty. That cam noses over about 6000 rpm
The Iron 2.02 heads flow OK with that cam, a set of good Aluminum heads will knock off 4/10's of a second.
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This may have been the best thing i have ever heard!!!
Hey thanks for the input guys, it's nice to know where we can go for help and not get screwed now adays!!!!
How the heck did politics get in here?
A 650 vacuum secondary cam will be plenty for that motor and the vacuum secondaries will be more foregiving and better gas mileage.
I have the exact cam, compression and CI, but with Vortecs. And I can tell you right now the 750 and the 600 I've had both had their strengths and weaknesses. I spent a couple years trying to get the most out of my 600 at the strip, and my very first run with a 750 gained 3mph. But...the 750 is a little lazier down low and doesnt have quite as much throttle response at half pedal.
Well I tried to google and wiki it. No luck! What is this thing "gas mileage" that so many of you seek? lol