B/PS lt1 formula

[ss3011]

I should have read the rule book before I commented on the camshaft question. The rule is " aftermarket cams allowed per horsepower claimed. Must check on or under factory specs for lift, duration, and overlap. "

This is like how NHRA stock class rules were back in the early 80's . That information along with the checking clearances was in the engine specs. Now all that is checked is lift. The duration, overlap, and checking clearances are not published anymore. I would bet NHRA doesn't even require that info from the OEM's , just the lift .

I remember back awhile a guy was trying to race a car in Pure Stock, and asked where to get those specs. I don't remember if he ever got a resolution.

[KennyAnderson]

Morning Russell,

I am the guy building the 93 Z-28. Just getting started as a matter of fact. Bought the car from a local guy who was already racing it in no-e here at home. All it has is a mail order chip in it. According to Jim Woods it is a natural C/PS although I plan on dropping down to D. I don't think I could get it light enough to really be a factor in B. As it sits its 100 lbs over for D mainly due to the nut behind the wheel, me. When my son takes over we will be good for C. This car is for him when he is done with JR's next season. I just bought an FTI 3800 stall converter and lock-up eliminator kit (Sorry Dan. Good friends w/ Greg and Troy Williams @ FTI and they made me a killer deal). Lock-up removes 6 lbs of rotating mass from the converter and this car wont see much if any street time. I was looking for more stall but with a max power @ around 5500 more than one guy felt like it would be to close to power levels on the shift fall back. I plan on putting in 4.10 gears and have some headers coming. I will use some small flowmasters and put dumps under the car. This should make a tad bit more power but more importantly cuts 50 lbs of junk removing the X pipe/cats/over the rear exhaust. The car runs 9.oh's and teens in the eigth right now so I need 7 tenths just to play since D has an 8.50 index. Hoping to make the IHRA race in Lakeland in a couple weeks but time is running low and I am busy as a 1 armed paper hanger. Plan on getting converter in and all a/c heater stuff out next week. I'll keep you posted and look forward to checking out your build.

[russellauto1]

THANKS kenny, That is some Great information. I was kinda looking at the same converter, but wasn't sure of the stall. I was leaning towards 4.10 or 4.56. I am still gonna use 7.5 rear axle but weld axle tubes, rear support and some other modds that some of the mustang guys do. As far as the exhaust, right now I have shorty headers with a aftermarket y pipe. Gonna do some research on what I can do there. I think I am going to leave a/c on cr for now. Just so I can make weight and cool off. What wheels are you going to run? I am unsure of the rear back spacing I should get. But I may get some 16" so I can put drag radials on the rear. Thanks for the info from Everyone and Keep it coming. It makes me think a little hard!!!

[ss3011]

GM sells a A/C delete pulley that replaces the A/C compressor. PN 10115875 .

[Mike Taylor 3601]

russelauto1
I have converter you may be interested in,is vigilante was in LS car w/4L60E,I think will fit 700R4 also, they rate it 3800-4200 is a non lock up has maybe 15 street miles since new,still has white grease on neck from install. can look for serial # if want more info.
will sell for 375.00 if interested call me 606-678-3039 shop 606 278 0601 cell
Mike Taylor 3601

[Dan Fahey]

Originally Posted by KennyAnderson

Morning Russell,

I am the guy building the 93 Z-28. Just getting started as a matter of fact. Bought the car from a local guy who was already racing it in no-e here at home. All it has is a mail order chip in it. According to Jim Woods it is a natural C/PS although I plan on dropping down to D. I don't think I could get it light enough to really be a factor in B. As it sits its 100 lbs over for D mainly due to the nut behind the wheel, me. When my son takes over we will be good for C. This car is for him when he is done with JR's next season. I just bought an FTI 3800 stall converter and lock-up eliminator kit (Sorry Dan. Good friends w/ Greg and Troy Williams @ FTI and they made me a killer deal). Lock-up removes 6 lbs of rotating mass from the converter and this car wont see much if any street time. I was looking for more stall but with a max power @ around 5500 more than one guy felt like it would be to close to power levels on the shift fall back. I plan on putting in 4.10 gears and have some headers coming. I will use some small flowmasters and put dumps under the car. This should make a tad bit more power but more importantly cuts 50 lbs of junk removing the X pipe/cats/over the rear exhaust. The car runs 9.oh's and teens in the eigth right now so I need 7 tenths just to play since D has an 8.50 index. Hoping to make the IHRA race in Lakeland in a couple weeks but time is running low and I am busy as a 1 armed paper hanger. Plan on getting converter in and all a/c heater stuff out next week. I'll keep you posted and look forward to checking out your build.

No Problem Kenny:
Having drivability issues with mine.
Want to make Lakeland too by taking the Auto Train to Sanford.

You made the better choice.
There are a whole lot of local guys my converter would work better for.
FWIW.. with a IHRA approves cam you could have gone to 4200 stall.
However if the 3800 stall if it flashes to 4600 you will be fine..

Dan

B/PS? Who in the world would want to run that?

Contact Mark Kent at GM about the cam specs. IHRA didn't have any for our car so we emailed him and he was kind enough to send us the OEM #s. I then sent those to Mike Baker and he approved the car for Pure Stock. Then gave those numbers to Bullet and they ground us a nice cam. With changing the cam and adding 1 & 7/8" headers we picked up more than 5 tenths.

Also, don't be afraid to put a converter and gear in it. We have a Yank SS4000 because I found one almost new for about half of what they cost. It's a great converter but it's a street converter. When I get ambitious I'm going to try to get it loosened up to 5000. We also put a 3.90 gear in the car because it was a DD at the time. They only go to a 4.10 on the gear for these cars and I wish I had that. We run a 28" tire. I believe with a 5000 TC and a 4.10 gear I could pick up even more. If I had an LT1 car (and I have had those) I wouldn't hesitate going with a 5000 converter and a 4.56 gear with a 28" tire.

Where are you located?

Scott

[russellauto1]

Thanks for the information. Would you still go with a 5000 converter if the engine redline is 5700? I know there is more to it than say a 5000 stall. We used to run 5200 8" converters in j/sa firebird with a 305. I guess it was no different back then! I totally agree with the gearing and that high of a stall.
When you got the camshaft from Bullet, What was different about it? Duration? CL? Oh yea, I'm in ohio.

Originally Posted by russellauto1

Thanks for the information. Would you still go with a 5000 converter if the engine redline is 5700? I know there is more to it than say a 5000 stall. We used to run 5200 8" converters in j/sa firebird with a 305. I guess it was no different back then! I totally agree with the gearing and that high of a stall.
When you got the camshaft from Bullet, What was different about it? Duration? CL? Oh yea, I'm in ohio.

This isn't a Russell as in the Gary Russell family from East Sparta is it?

I'd have to look at my cam card but the lift and duration were the same as stock and I do recall the CL being different. I can honestly say with the new cam down low the car is a different animal. Our best 60' (with "only" the 3.90 gear and a DOT drag radial) is 1.53 in poor DA with a crappy prepped track. When you call Bullet ask for their Stock Eliminator cam guy John. And yes, they'll get it to run past 5700 so I would go with that loose of a stall.

Scott

[russellauto1]

No My name is aaron and I am in Columbus Ohio. Thanks for the info. I am gathering parts right now for the car. Headers are coming, Will call bullet in a few weeks after we get the engine out of the car. That is an Awesome 60 ft time.