wht97ws6ta

Finally got my 97 trans am to rpm for a tune. Results kind of surprise me a bit. It put down 423 rwhp at 6800 368 rwtq at 5700. Torque was within a few ft lbs from 4000 to 6200. Car pulls real hard to 7k. Maybe I can get it to test n tune Sunday and see what its made of.

SwampWS6

iTrader: (7)

Thats great bro! Im happy for you! Got list of mods?

Catmaigne

iTrader: (6)

How big is the cam and what's the rest of the top end look like?

TravisMcGill2000

iTrader: (2)

Pretty good numbers. Whats rest of the setup.

wht97ws6ta

Cam is an AI grind. 228/235 .613/.613 108 LSA. I ported the heads. I put 5/16 guide liners in the stock lt1 guides and resized them for 8mm stemmed valves. The whole valvetrain in the heads was from a set of competition AFR small block ford heads that a fella ordered for hyd roller instead solid roller. Picked up valves springs cups retainers and keepers for 100 bucks. Its PAC dual springs. Heads measured 182cc and flowed around 270 iirc. C/R is 11.3 with a .022 quench (yea I know that's tight) but it works. All forged bottom end. Ls7 lifters.

SwampWS6

iTrader: (7)

That's a really nice setup. I cant wait to see other comments on an 11:3 CR when most here running a 12+ CR and barely crack 400. (Im beginning to wonder if they did something wrong )

Have fun with it!

bowtienut

iTrader: (1)

That's fantastic!
Great job with those heads!

M6 I assume?
STD correction?

Looks like the same cam I have. My peaks were 4600(tq) and 6400(hp).
11.3 CR is not low at all. In fact, if it's a daily driver, it gives you some buffer for varying fuel quality. What total timing did it want?
Honestly, I don't believe that quench number is right. It would be tagging the heads at 7k. Did you possibly mistype, meaning .032"?

96capricemgr

iTrader: (1)

Could have measured at the rocked up side of the piston?

wht97ws6ta

Quench is indeed .022. I build engines everyday so checking the piston at pin axis on both sides is standard practice. Been back into it before. Pistons were clean but no touching. This car is an a4 car with a 3500 vigilante. Was locked during pulls. Also I just noticed the last pull he made he set timing at 35 which brought my peak torque down to 5200 which makes more since. Car was making 350 ft lbs of torque by 3300 rpm

one fast zo6

iTrader: (490)

that is good POWER.

TravisMcGill2000

iTrader: (2)

Congrats on the numbers. Get it to the track and lay down some low 11s.

cardo0

Wow, awesome build wht97. It nice to read a success story on the forum here once in a while. Dont read many using tight LSA like 108 anymore with more modern head designs - seems to work well for u. Can u tell me 'bout the vlv guide boss? Did u have trim them down for that lift? Or are those longer vlv stems?
What are u using for bottom end? Id like to guess u have longer rods in there. Please let us hear the entire recipe - dont leave us hang'n.

Congrats,
cardo

WS Sick

Yep run some Gas from around here (NW Oklahoma) and you'll run a little more tolerant compression. I wish we had good fuel around here all I can get on a regular basis is 91.

Nice numbers. I'll bet that thing will move.

BizZzatch350

iTrader: (33)

Really stout numbers.

wht97ws6ta

Valve guides were cut for the .500 diameter 5/16 stemmed viton seal that we keep in bulk. As far as shortening the guide no its pretty close to stock length. The retainers are a lot shorter than stock ones underneath, so it wasn't necessary to cut down the guide. Bottom end is a little bit of a mismatch as far as part brand goes because a good friend gave me a set of scat h beams. So I put new bolts in em and put them on a eagle 4340 crank. Bearings are acl h series race bearings set up at .0033-.0035 on rods and mains and I run valvoline vr1 20w50 oil through a std m55 melling pump that I ported. Pistons and rings are the srp pro kit with the LS7 ring pkg. That's about it other than a full block prep like align hone, bored with torque plate, and decked.

Puck

iTrader: (17)

That is some awfully tight quench, keep her clean cuz once you get some carbon on those pistons and valves they may start kissing at 7k rpms.

Very nice results though!

wht97ws6ta

Yea some times you will get some slight contact with that close of quench but I've never seen it to be detrimental. I've set heads up to resurface that had some contact from to close of quench and put a .001 skim cut and never really seen the decks cave any. Not saying it wouldn't if you got really carried away with it. My 400 I built a l while back was around .030 and it would make contact but that was a stock crank with a scat pro comp 6.125 I beam rod. Oh and for who asked about the rod length in my lt1 they are 5.7 factory length. Forgot to add in the last post that I cut the top off my intake in the band saw to gain better access and welded it back on. So intake got a lot of attention

wht97ws6ta

Here the graph if anyone can make heads or tails of it.

96capricemgr

iTrader: (1)

VERY VERY common in LT1s when people think outside the Comp catalog. Most of us running "custom cam" setups on NA LT1s are running 108-110 sometimes you even see 107.

wht97ws6ta

Yea its funny how a lot of people get hung on the LSA numbers. You hear some say they will be hard to tune. The fact of the matter is the degrees of overlap is what really needs to catch the attention. You can have longer durations and wider LSA that result in the same degrees of overlap that may not be any easier to tune.