My Vette. lol

 

I have a 406 in my car with small, ok L98 heads a cam to match the heads 3k stall and 355s. I cant launch worth a **** due to wheel hop on 15 yr old Kelly Chargers and run 8.55 1/8th mile which translates to 13.3. Better tires and i should be in the high 12s.

 

Yes to the 12 sec.

No to get 20 mpg. With 4 spd and 3:55!!!

 

My 350 218-224 HR and 1.6 RRS has over .500 lift on the TFS heads. 10-1 comp, AG.
At under 3K is is very thrifty w/fuel. My SWAG says 20mpg. Pressing the loud pedal on 315 rwtq gets things moving fast w/o a downshift. I can't wait to see the improvements of no smog rams horns. I have the crappy small ones.

I was thinking a no smoke off the line w/low end and let er rip into 4th gear. I realize there is a trade off, but I think it can be done. A 350 rwhp and a 350 retq should do the job w/wider rear tires.

JMHO

 

Can anyone do a DD for a 350cid, AFR 180s, 224* HR cam, AG & 750 carb?
I'm guessing 450 hp/460 tq!

JMHO

R

 

It will be hard to do that with a 350. I like your cam pick. I don't know how the AFRs compare to the performer RPMs but we made crate 383s that would crank out 460 hp all day long with the RPMs a good intake, that cam, good carb, and exhaust.
The 350s were noticeably less powerful in the test car which was a 68 camaro with 3.73s and a turbo 400.
If you run a automatic with that cam I would loosen the converter about 400 rpm from stock. Not because it won't pull off idle, it just makes sitting at a red light a little nicer at idle.

 

A 383 will get into the 12s, 3:70 gears should also work.
It will be hard to get 20mpg w/o overdrive.
I'm thinking a serious 350 w/3:55 and 4 speed is doable, but not easy.
A 6" rod and 10.5 comp will crank up the tq.
Any formula for how much tq/hp and gears to run high 12s in 3500 lbs vette?

R

 

i needed to pull a 36' triple axle trailer with a 28' cigarette race boat from Michigan to key west FL. then MA. and NJ. in summer and in winter a 4 place snowmobile trailer up steep grades and sometimes in heavy snow. i purchase a two year old chevy 2500 series suburban with 3.70 posi. rear. 40gallon fuel tank,captain chairs up front with 4" raised spring kit.i ask the champ to help me build a torque engine and he would check shop for freebies. he had 7 "million dollar" venolia racing pistons just had to purchase 1 piston.he would not allow engine to be built without 6" rods so he purchase them and .he had a forged crank in shop and i track down a "very early 350 truck block 4 bolt main that overheated with a lot of miles" i purchase 1992 alluminum ,angle plug corvette heads and five angle valve job and other head modifications.we used modified 1992 tuned port injection and computer harness for engine by A&P auto in AL. had tuned long tube headers with "T" in line that were coated and flow thru mufflers .700R4 no lock up (weakens tranny used for towing).the truck with trailer would beat my 82 collectors edition corvette and get 16mpg on open road with snowmobile trailer. 383" fresh air intake, modified and ported tuned port injection .

 

Still hoping someone will do a DD for a 350 w/AFR heads and intake. The AFR heads should be able to handle some cam. I'm thinking 224/224 due to AFRs good ex port.
The website mentions #460 tq w/crappy cam?
Anyone have some real numbers?

TIA

R

 

No mention of Intake Manifold. If Your going with a Carburetor then Edelbrock used to make an SP2P that was designed just for what Your after. It made the Motor knock all the time and fell flat on its face above 4k RPM but other than that it worked. For FI the good old TPI should be right up your alley, except with sequential FI run a modern ECM.

 

It must have been the way the 383's were built. They are not necessarily known to be a motor that makes its power in the upper rpm's. With the stroke the same as the 400, IMO, they both would be good torque motors but with the bigger bore of the 400 (better breathing) the 400 making abit more HP and torque than the 383.

 

If there is a bolt on head that will do the job then AFR is probably the one. What you need to decide is which one. The 180cc head is going to be better for low end torque and throttle response on a 350. The 195 will give you more HP up top but less torque down low.
The lower torque down low can be overcome with low gearing think 4.11 in the diff.
Then you may want a higher cruising gear to reduce the RPMs at cruise so that means a 5 speed manual or 4 speed auto.
A happy medium may be a 3.55 with the 4 speed.
Get the compression as high as safely possible and put in a shorter cam like 220 @.050 and you'll get good torque with the AFR 195 and probably achieve your 460 torque. Not sure if the 180 would get you there or not.

I have been running Dart SHP 180's for the last three seasons on a 350. The 180's cc out at 197cc's so really a 200 head.
Then I have a 219@.050 roller cam with a 2600 stall converter th350 and a 3.08 rear diff.
The power doesn't really come on until about 3300 RPM. So the engine has to work pretty hard to accelerate until that point. A big part of the reason is the 197cc heads and relatively low CR at 9.9. Other part is density altitude that I operate at.
These heads and cam put out 400 lb torque @ 4400 and 406 HP @ 5700 RPM
To remedy the late power band the plan is to up the CR and get new heads. AFR is probably the ones I'll get. 180's that actually cc at 180cc's.