2000RATA

The 2.73's are not holding you back. A good friend of mine has CHS portef heads (806 castings '98) a 224/224 Comp cam all the bolt ons ls6 intake. He has 2.73 gears Yank converter and runs 11.40's all day. Several guys in our circle same heads/cam size same results. Low 11's high 10's. It takes more cam for 10's but its doable. And im talking about stock bottom ends pump gas pass seat and back seats removed only.

Roarin_8

iTrader: (5)

What mph is he running at? I just know that my 60' went from 1.7 to 2.4 after the cam and header change. Mph went up from 111 to 113, the 111 was done in December with 20 degree temps and the 113 was done in July with 90 degree temps.

2000RATA

It was 118 mph. I know on a 75 shot of NO2 he ran a 10.9x at 125 or 126. Pretty sure the 60' times were high 1.5 or low 1.6's. We had another friend with a '98 SS 226/228 cam same converter but 4.10 gears it ran 11.20's. That guy always gave the guy with 2.73 gears hell for not changing them but he said why? The 2.73 geared car dynoed 425 rwhp. Both of these cars I mentioned were '98's and had ported '98 (perimeter bolt) heads.

thunderstruck507

iTrader: (18)

What converter? What tire? One of those 2 things in your combo SUCKS hard.

Roarin_8

iTrader: (5)

Yank SS3800 and Nitto 555R. Before anyone says anything about the Nittos, I did hit a 1.7 60' with the Nittos before the headers and cam. Once the cam and headers were done, I did not spin out of the whole when I came off the line. The car was very lazy, 12.5 @113 with a 2.4 60' at Atco in NJ. Doing the 1/4 in 1st and 2nd gear doesn't help either. Car doesn't hit 3rd till I'm a few feet from the traps which is why I said that the 2.73s are holding me back.

thunderstruck507

iTrader: (18)

Sounds like something is up. There is no good reason listed here that a cammed ls1 car with a 3800 converter should be bogging to a 2.4 60ft. I wouldn't point fingers entirely at the gears for it either unless you are running a 29" tall tire or something crazy.

Has the car been properly tuned? Are you sure it isn't missing (could have damaged a plug or wire during install)? How does the transmission fluid smell/look?

Possum Boggs

iTrader: (19)

i vote 806's as the worst heads

Roarin_8

iTrader: (5)

Transmission is fine, always stay on top of that. Car isn't missing, as far as tune, the car got retuned after that run but haven't had a chance to get a GOOD run in yet. I'll try to post 2 vids so you can see and hear how it is.

Roarin_8

iTrader: (5)

This is how the car was with just nittos, the SS3800 converter and the SLP Loudmouth. 12.2 @ 109mph 1.7 60' with only 313 rwhp.
http://youtu.be/G_FVfZlGVmM

This video is before the cam and header setup got re-tuned, it ran 12.5 @ 113 with a 2.4 60' at Atco in July.
http://www.myspace.com/video/roarin-...ne-run/2633897

This video is after the re-tune at Orlando speed world in October. It ran 13.0 @ 110 with the red light (clocks started running and spinning terribly off the line since I couldn't get a proper burnout because of the front brakes at the time) don't remember the 60'. Listen to when the car hits 3rd and then look how close I am to the traps.
http://youtu.be/TVtgoue0fD4

Roarin_8

iTrader: (5)

Here's another good vid to show when the car hits 3rd, around 101-103mph
http://youtu.be/GLrBc2ALbC0

Roarin_8

iTrader: (5)

Should have updated this awhile ago. Got everything fixed https://ls1tech.com/forums/generatio...-breakage.html and have to take some metal off the frame since now the passenger side header is hitting. Was thinking to just say F it and go with a tubular K member from BMR. In the meantime, with these heads, 10% UD pulley and "LS1 Intake" (I know, I know) how much of a gain do you guys think I've picked up? I'll include my old dyno sheet, when the cam and headers were first installed back in 2005, when I get home today.

sabersaw30

iTrader: (10)

490rw! We need to see that settup.Wow.

QuicksterZ

iTrader: (2)

New to the forum dont wanna start a new thread since have a question about the 243 heads dont mean to hijack the thread either op. I have a 98
z28 read that they have the perimeter valve covers that being said 243 have center bolt valve and head bolts. What else would i need to do the swap to center bolt heads. Thanks

Roarin_8

iTrader: (5)

I'm guessing that you would need matching valve covers but that is just a guess.

Roarin_8

iTrader: (5)

Ok here is the dyno sheet. This was after the headers and cam were done back in 2006. Tuner said that with that cam, I was making 20hp less than what he usually saw with it. He did blame the lifters back then.



Now, cam is the same to replace the one that got damaged but car now has 10% UP and the 243 heads untouched. Any guesses to what the rwhp would be now?

rmelton28

Better question is how many posts it took you to be a jerk??

2000RATA

Ignorance runs wild on this board. See my earlier post where a friend of mine runs 11.40's with 224/224 cam and 2.73 gears. Those are 806 heads. It kills me so many still struggle to run mid to low 11's. All the 806, 853, 241 heads flow the SAME ported! The 243 ported flows more at .600" lift and up. They do not flow more below that. So your .600" lift cam benefits little from a few cfm the one time the valve sees .600" and the valve sees everything below that twice.

DREAMZ28

iTrader: (1)

From what I've read, Cams usually spend a good amount of their time at high lift, depending on a lobe. More time than they spend at mid life if I'm not mistaken, doesn't matter that they see those lifts twice. But your point is still valid.