i know this may not be the perfect question in the advanced tech section but i know the guys with all the knowledge will see it here. i was wondering what is the absoluter biggest hydraulic roller cam i can put into an LT1. drivability is not an issue because i dont drive it on the street. it has stock unported heads that i know dont flow very well at high lift so i will need duration. the cam specs i got from a local guy to run are 242/248, 584/579 lift on a 110 lsa. would this be optimum. i have a th400 with a 4000 stall, 9" with a spool on a 28" tire and full suspension. basically i want to see how far i can go with a stock bottom end and stock unported heads. i have already gone 11.7 @ 111mph with a small 224/230 cam. any info would be greatly appreciated. sorry for the novel.

 

ya might slow down with that big cam, but if he thinks he knows what's best you can try it... I wouldn't do it since most guys can't get HR cams to work over 6000rpm and that's the only place that cam would be worth while

Bret

 

Solid roller time baby!

 

the only reason i dont want to go solid roller just yet is because i am still on the stock short block and i know i cant rev it high enough to really benefit from a solid roller. i jusy wanted to see how fast i can go with a true cam only car with stock unported heads. the car with the cc503 cam in it now made 320 rwhp and 323rwtq. the car has a race-weight of 3300 lbs. i know the lift on that cam previously mentioned seemed kinda high so i was wondering if running a smaller lift with good duration would work good with the stock heads. or would it be smarter to go solid roller right off the bat.

 

>other than knowing the specs or removing the cam from the block is there any other way to find out what the duration and/or lift of the cam is ?
I hope there is , but I don't feel real good about this answer .

 

Not sure if I agree regarding HR cams not working over 6000 rpm. Sure.... you will need to change the springs and lifters that match, but no big whoop these days.

My last combination reved clean past 7000 rpm with a HydroRev kit and the one now goes 7200 on the dyno all day long not even using one. Nothing really special at all regarding setup. It’s not like we had to try a bunch of different things to get it to rev clean or anything.

Always a big believer in evolution vs revolution and I'm in agreement that the car may go slower, but then again….. the only way of knowing for sure is to evolve by giving it a try. There are rarely free lunches in life and most likely you will loose some power in the lower part of your effective powerband but will the gain counteract??

Cams in the overall scheme are a hassle to put in, but really don’t cost all that much. Now add new lifters, new springs and that changes a bit, but the springs and lifters will last regardless of what cam is used.

Think I’m on my 14th different LTx cam and haven’t found that magic bean that grows giant bean stalks yet. Still looking though, but at this point my feeling cams are almost a tuning issue and you change one for desired powerband.