Improving 60' times, third gen f-body

MAURICE BLENDHEIM · 04-30-2014, 09:16 PM

Tony… What engine displacement, cam, intake, head and carburetor? Does the TH400 have stock rotating internals? What determined your choice on 3.73's. MB.

TonyB83 · 05-01-2014, 08:25 AM

Thank you all for the replies.

Quote:

the converter and gear sound like the makings of a street/strip car and not a bracket car. Tell us about the engine...heads, manifold, camshaft, compression, etc.

3rd gen f body bracket cars weighing 3100-3200 lbs. with driver run easy mid to low 10's with nothing special small blocks, power glides, 8" converters, 4.56 gear and 10" tires

Quote:

Originally Posted by MAURICE BLENDHEIM

Tony… What engine displacement, cam, intake, head and carburetor? Does the TH400 have stock rotating internals? What determined your choice on 3.73's. MB.

383ci, Comp XE288HR cam, Edelbrock RPM Air Gap, Holley 650 (modified, flows 740) AFR 195 heads (ported, 2.05 valves), 10.9:1 compression. Stock trans internals, just upgraded soft parts. Went with a 3.73 mostly because it's street driven but I wouldn't be opposed to going to a 4.10.

1320racer · 05-01-2014, 10:03 AM

so it is a street/strip car.

That said, it's all about compromises, what you are willing to sacrifice in drivability for quciker ET's but without question you need more converter and more gear and the right converter from the right manufacturer won't give up any street manners.

njk53 · 05-01-2014, 01:28 PM

I think the 3:73 gear and converter are the issue. I would think a converter in the 4800-5000 range and a 4:56 gear would do the trick. What RPM are you turning the motor through the lights? Depending on trap RPM you may be able to stand even more gear.

Greg Hill · 05-01-2014, 03:26 PM

1.44 with a 3.73 gear, stock 400 and a tight converter is pretty good. A low first gear trans (2.75) would help quite a bit, maybe a 200 or a 200r4 with overdrive since it's a street/strip car then you could use more rear end gear.

Doug Blackley · 05-01-2014, 09:40 PM

Going to the 4.56 gear will allow a taller tire and help the launch a bunch. And the 56 gear isn't that bad to live with on 5he street either.

MAURICE BLENDHEIM · 05-01-2014, 11:07 PM

Tony...4.10 - 4.56 -4.88's alone should put you into the low 1.40's maybe high 1.30's if your lucky. Faster by adding something like a 4000-5000 convertor, but you may sacrifice the street car thing? Your intake and cam will become a factor the closer you come to 7000 RPM. Hope this helps...MB.

04-30-2014, 09:16 PM	#1
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 569 Likes: 311 Liked 284 Times in 87 Posts	Re: Improving 60' times, third gen f-body Tony… What engine displacement, cam, intake, head and carburetor? Does the TH400 have stock rotating internals? What determined your choice on 3.73's. MB.

05-01-2014, 10:03 AM	#3
1320racer VIP Member Join Date: Nov 2007 Location: New Jersey Posts: 2,628 Likes: 160 Liked 759 Times in 379 Posts	Re: Improving 60' times, third gen f-body so it is a street/strip car. That said, it's all about compromises, what you are willing to sacrifice in drivability for quciker ET's but without question you need more converter and more gear and the right converter from the right manufacturer won't give up any street manners.

05-01-2014, 01:28 PM	#4
njk53 Senior Member Join Date: Jul 2007 Location: East China, MI Posts: 504 Likes: 0 Liked 0 Times in 0 Posts	Re: Improving 60' times, third gen f-body I think the 3:73 gear and converter are the issue. I would think a converter in the 4800-5000 range and a 4:56 gear would do the trick. What RPM are you turning the motor through the lights? Depending on trap RPM you may be able to stand even more gear. __________________ Nelson Kowal Stock 345 Last edited by njk53; 05-01-2014 at 01:30 PM.

05-01-2014, 03:26 PM	#5
Greg Hill VIP Member Join Date: May 2006 Location: Louisville , KY Posts: 1,995 Likes: 68 Liked 279 Times in 68 Posts	Re: Improving 60' times, third gen f-body 1.44 with a 3.73 gear, stock 400 and a tight converter is pretty good. A low first gear trans (2.75) would help quite a bit, maybe a 200 or a 200r4 with overdrive since it's a street/strip car then you could use more rear end gear. __________________ Greg Hill 4171 STK

05-01-2014, 09:40 PM	#6
Doug Blackley Member Join Date: Dec 2001 Location: Hanover, MA Posts: 430 Likes: 3 Liked 1 Time in 1 Post	Re: Improving 60' times, third gen f-body Going to the 4.56 gear will allow a taller tire and help the launch a bunch. And the 56 gear isn't that bad to live with on 5he street either. __________________ Doug Blackley 1697 STK

05-01-2014, 11:07 PM	#7
MAURICE BLENDHEIM Senior Member Join Date: Jun 2011 Location: Langley (no igloos), British Columbia, Canada Posts: 569 Likes: 311 Liked 284 Times in 87 Posts	Re: Improving 60' times, third gen f-body Tony...4.10 - 4.56 -4.88's alone should put you into the low 1.40's maybe high 1.30's if your lucky. Faster by adding something like a 4000-5000 convertor, but you may sacrifice the street car thing? Your intake and cam will become a factor the closer you come to 7000 RPM. Hope this helps...MB.