Anyone using Comp's Mutha Thumpr?

If this helps the original poster at all, I didn't have to get to fancy on the carb tuning to make it happy.

A 4779 750 holley. I drilled the idle feed restrictors to .033 for a little more adjustability. I can make the cam idle down to 600 if I want to which is pretty good with a 107 LSA. I would have to play more with the idle circuit if this were an auto car more than likely.
I had to play with the squirter circuit going to a .035 squirter with a pink cam set in the #2 hole.

Got the idle AFR at about 13.8 to 14.0, sometimes fluctuating a tad leaner at 14.2 or 3. Could probably go leaner but it makes the car more tempermental on cold starts and even luke warm starts. I am currently running 16 initial timing and 34 degrees total. The motor liked 36 on the dyno and I may bump it to that with more driving. Experimenting with 91 octane right now with no complaints.

This cam is a bit more radical than the fuel injection version they make for the LS motors. But I'm sure a savy tuner can make it idle and work if this is really what you are looking for. Vacuum sucks as you would expect on a 107 LSA. Once warm I get a rock steady 8 inches at an idle of about 8-900. It wouldn't like power brakes at all. In a smaller motor it would make even less vacuum.

2nd video has better audio. It must've been the wind. The Ventura sounds great. Rare beast, like you said. In other news, I saw a Pontiac T-1000 this weekend, no way a Mutha Thumpa would go in that thing.

What engine do you have in that car FBJones? 455? 400? I ran a .030 over 428 in my '67 GTO for a while, loved the torque it had.

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Originally Posted by Too Fast

2nd video has better audio. It must've been the wind. The Ventura sounds great. Rare beast, like you said. In other news, I saw a Pontiac T-1000 this weekend, no way a Mutha Thumpa would go in that thing.

What engine do you have in that car FBJones? 455? 400? I ran a .030 over 428 in my '67 GTO for a while, loved the torque it had.

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This Pontiac came factory with a small block chevy. So I've left it that way, and currently run a 406 sbc in it.
Don't worry, I've also been a true pontiac fan and have a formula with a real pontiac engine in it :D

^^^I know you are a Pontiac diehard, just giving you some shit. Didn't know they put a lot of Chevy engines in the Ventura.

You probably know the GTOs etc., in Canada, had Chevy engines? I know some had big blocks instead of Pontiac engines. Talking 60s cars here.

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Originally Posted by Too Fast

^^^I know you are a Pontiac diehard, just giving you some shit. Didn't know they put a lot of Chevy engines in the Ventura.

You probably know the GTOs etc., in Canada, had Chevy engines? I know some had big blocks instead of Pontiac engines. Talking 60s cars here.

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:chuckles: That's alright, I'm thick skinned. Ya have to be owning oddball cars like this.
Ya the Canadian Pontiacs used chevy engines throughout the early 60's and on up from what I remember, both small block and big block chevys.
The Ventura's here in the states only got the chevy engines this year only (1971) as mine is. Which was the first year for production of the ventura in this body style. In 72 they went back to poncho power. So it makes this car a little more unique compared to the others. I don't mind it, I like all cars, if you knew what I had hiding in the garage I'd probably be banned from this site :chuckles:

It's funny how I can drive the Formula to a cruise, and Pontiac lovers will be your friend, talk for hours. The next week I drive the Ventura and those same guys shun you off like you have a disease :chuckles: Some people just don't appreciate cars for what they are. Too bad.

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Originally Posted by Firebirdjones

:chuckles: That's alright, I'm thick skinned. Ya have to be owning oddball cars like this.
Ya the Canadian Pontiacs used chevy engines throughout the early 60's and on up from what I remember, both small block and big block chevys.
The Ventura's here in the states only got the chevy engines this year only (1971) as mine is. Which was the first year for production of the ventura in this body style. In 72 they went back to poncho power. So it makes this car a little more unique compared to the others. I don't mind it, I like all cars, if you knew what I had hiding in the garage I'd probably be banned from this site :chuckles:

It's funny how I can drive the Formula to a cruise, and Pontiac lovers will be your friend, talk for hours. The next week I drive the Ventura and those same guys shun you off like you have a disease :chuckles: Some people just don't appreciate cars for what they are. Too bad.

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OMG, not a :no::no::no: FORD?

Or worse, some FWD ricer you think is cool? With some off color, falling off "ground effects"? VTEC, Yo?:hitfan:

Personally, I really don't give a damn, I like most V8 RWD cars, and can respect most any fast 4 wheeled vehicle. Just happen to prefer V8, RWD Pontiacs.


You're right, you would be banned, stoned, condemned to any meausure of awful deaths.

:yup:

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Originally Posted by Too Fast

OMG, not a :no::no::no: FORD?

Or worse, some FWD ricer you think is cool? With some off color, falling off "ground effects"? VTEC, Yo?:hitfan:

Personally, I really don't give a damn, I like most V8 RWD cars, and can respect most any fast 4 wheeled vehicle. Just happen to prefer V8, RWD Pontiacs.


You're right, you would be banned, stoned, condemned to any meausure of awful deaths.

:yup:

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A 69 Mach I Super Cobra Jet wouldn't be so bad would it? :D An unrestored survivor with 60K and the Marti Report to back it's authenticity. High dollar car nowadays that I think anyone would like to have, ford or not.
I like anything from the muscle car era, especially factory big block cars.

LOL.

Hell no.

That is one nice Mustang! Anyone here who would say different should be banned immediately.