Im using a custo grind cam and full cnc ported heads. 93 stock bottom with 3.73 and 2400stall. New 30 svo inj, 52 tb, vented opti, and new LT4 timming chain. Started out with 275 hp and 300TQ The new dyno results are 327 hp and 322 TQ. The graph shows a hp peak at 5600 then all of a sudden both hp and TQ go straiht line down. Something is happening here. Car runs way rich at WOT in the beginning, bogs a little before it pulls and cleans out. Theres tunning issues here obviously. Im short at least 20 hp and TQ . Talking with installer says it felt like a rev limiter. My tunner said rev limiter set at 6400 and thinks it could be a valve train issue. The installer said new pushrods where needed so he changed them. Is it possible he should of left my 7200 Manley pushrods in there? What do you guys think about all this. The cam should make a little more power then tipical hot cam but it has a nice lope idle with a 110 LSA.

Not sure.

I will say that the only reason I changed over to a MSD 6al was from being tired of the inconsistant Lt-1 rev limiter.

Now, I just set my limited with the little pills on the box and I've never had a problem since. My Revs with my hotcam setup etc are now set at 6300 but I generally shift at 5900 or 6000.

My personal opinion is the factory rev limter and factory tac lag is garbage on these cars.

What springs are you using ?
Also what's your rocker arm ratio ?

You'd know if it was the rev limiter. Damn nasty thing. Mine is set at 7K right now and it's super bitchy when I find it 8O

NEAL!!!!

Welcome bro!!!

I can't help much with this problem... I don't have enough experience with the high-po stuff...

Pushrods wha? should have got that right the first time out! so custom grind cam but wrong pushrod length? and no specs, huh? why did this guy ask for help? When going with a new cam and or timing chain dot to dot means nothing to me. let alone "straight up" I have seen timing gears off by quit a few degrees as well as many cams have built in advance or retard so without a cam card and degreeing the cam, you and your builder or tuner are only pretending. cnc heads tell us nothing either. cc's? deck height? no push rod length, installed spring height,ect. frick- geesh

I'm running a very similar set-up in my '93 and have similar problems. I really think that it is the tune. Some people have trouble tuning a speed density car. I'm real close to going with Alvin (although I don't really like the idea of a piggy-back chip). Are the 30 lb. injectors overkill? I have the 24lb. svo's.