13.'s with a roller cam?

I currently have a 350 with cast sportsman II 2.02/1.60 heads, performer intake, 4.70 lift, 226 dur @.05 (3/4 race) cam, holley 600 carb, headers, and 9.5:1 compression all good for about 370 hp@5500rpm. TH350 w/ shift kit and 3000 stall converter, out back i have a 12 bolt posi with 3.31's and j-bolt traction bars. It pulls 14.5's in the 1/4 mile. My question is what i could do to put me in the 13's. I want to convert to a roller cam with a little more bump and put a performer rpm airgap with a holley 670 avenger carb. This will put me at around 410 to 425 hp im guessin. Problem is that my bottom end of the 350 is completely stock. Crank, rods, pistons. Will this hold up to about the 6100 rpm the roller will need? will this upgrade put me in the 13's? what other tricks can i use to lower my 1/4 mile time? Any comments help. Thanks!! :D

Doesn't sound like enough gear. What RPM are you turning at the end of the quarter????

im not too sure but im guessin about 4600-4800 rpm

Next time take a look at the tach and see what the RPM is at the end of the quarter.....with that motor and the right gears it should allready be in the 13's......

actually more like 4200-4400 rpm. sorry :D

i went to a gear calculator and put in the trap speed of about 97mph with 3.31's and it gave me 4200 rpm. I also didnt mention that i have radial t/a's at about 25 lb's of pressure and i do get a little tire spin off the line.

get a better set of tire and work on the 60 foot .try set of bf drag radials tires

were the power is at cam, heads , intake , and compression

I think the car should be in the 13's as is. You may have a healthy enough of a 350 to graduate to a bigger carb. I'm running a 15.4 at 88mph in a truck with 29.6" tires, a 3.07 gear, a stock converter, a stock qjet carb, and stock hei ignition. If I went to a 3.73 or 4.11 gear, I could probably be deep in the 14's. My motor is a lot more conservative with only 212 degrees of duration at .050" and .447 lift overall for the cam and 9.25:1 compression. My best 60' was a 2.318. A performer RPM intake for you will probably match the cam a little better as well.

The move to the 670 is the right move, but I think I would change that rear gear to 355's. Your WAY too low in rpm's to be hitting the traps at 4200 RPM. I would even consider trying a 750 cfm holley for a couple of passes with the cam you have before I went changing it out. You should be hitting the traps at about 6200 to be getting all of the power band, and your strangling those heads with the small carb.
No flow- no go....just a thought................Jim

i agree with you on the gears. The 12 bolt was off a 68 camaro with stock 3.31's. Ill probably upgrade to a set of performance 3.55's or 3.73's soon. Also still wanted to know if a stock bottom end can hack the 6100 rpms? Thanks!

Yes it will handle 6200 rpm easy.

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Originally posted by 70_"SuperNOVA"
i agree with you on the gears. The 12 bolt was off a 68 camaro with stock 3.31's. Ill probably upgrade to a set of performance 3.55's or 3.73's soon. Also still wanted to know if a stock bottom end can hack the 6100 rpms? Thanks!

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yes more gear will help BUT if it spin now all you will do is spin more make this run faster carb gear and cam more stall more rpm and on the bottom end if done rigth it should take 6500

Drop your air to 12 lbs in the rear tires.......

why not try a set of bf drag radial tires? soft tires hook lot better than 10 psi in stock raidials ??

Very true......I agree.

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Originally posted by hambiskit
Very true......I agree.

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did want to be a ass but my friend?? drop my stock radials he said this low .HE SAID and at the big end my car was a hand full .that was a long time ago and he keeps is hands off my tires:)

ive heard good things about the bf drag radials, but this car is driven at least 4 times a week on the streets too. Can the drag radials be used on street regularly too? I thought they were just to get to the track and back. A friend told me to try the Nitto 555r tires too. They are drag racing soft compound tires that also give about 15,000 miles of street use too. What would be the best choice?

i run the bf drag radials tires on both of my cars and i like them .have never used the nittos .i used to drive my cars 3 to4 times a week tires last me two years .

Hey Pat, do you know what the speed rating would be on the BF drag radials??? How bad do they heat up on the highway??? I live in a small town in the sticks, 50 mile drive for decent cruising, curious how they might do...... Thanks

k i have a 72 pontiac ventura 2 , wich will soon have a 383 stroker in it , make around 450-500hp

what should i be looking at with stock gears in the quater mile/ and what times could i see with 3.73's

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Originally posted by Dave Severson
Hey Pat, do you know what the speed rating would be on the BF drag radials??? How bad do they heat up on the highway??? I live in a small town in the sticks, 50 mile drive for decent cruising, curious how they might do...... Thanks

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i have not run much on the hi way with them but i can not see them running to hot they have work very good for me. i think they would work good for you . i run at 50 mph and much faster when the time is rigth . all the time and run the side roads from were i keep my cars to home 20 miles one way and have not had them heat up and come apart . they see 50 miles on them a nigth and seam to hold up good

Thanks for the information, Pat. I know they hook fairly well for a street tire, was just curious about their down the highway capabilities. Appreciate the help.

I'm thinkin you should into the 13's as is.

What RPM does the motor quit pulling?

What RPM do you shift at?

I thought the same thing. I was expecting to be in the high 13's but there are some factors to consider. Im running on radial tires, i do have tire spin on launch, and most of all, in hell paso, texas, the elevation is a whopping 3800 feet. When pluggin in my best time of 14.45 to a sea level corrected time, she will run 13.7's. The power curve is set to max out about 5500 rpm, and im shiftin just short of that around 5300-5400rpm. Im sure if i put some drag radials and put her on a diet droppin a couple hundred lbs, i'd could pull a 13.9. What do YOU think? :D

Just try not to spin the tires on the line, you'll be faster making a conservative start than launching hard and spinning the tires some. The first 60' are the most important of the quarter. A top fuel car can run full throttle for the first 60', then let off the gas and still run a 10.something at 70 something mph.

very true. Ill monkey around with different rpm launches and see what i can pull off. Thanks for the advice :D