big dave

Assuming that you're installing the same h/c setup from a 350 to a 383 or larger motor, what gains are seen from the bigger inch motor? I'm looking at several combos, but because of a limited budget, I'm trying to figure out the best route. My current h/c/i setup netted me 426/383 rwhp/tq on a stock bottom end...what should I expect on a 383 or larger ci motor?

IllusionalTA

iTrader: (9)

Same exact induction pkg probably lil more torque and same hp earlier in rpm range given same state of tune.. But that's just off the bat, change cam up to a larger piece, and you'll pick up all the above.. And use more of the displacement

Snkebait95

iTrader: (16)

Both. Probably more gain in torque than horsepower but I have no first hand experience.

KCS

iTrader: (20)

PEAK horsepower may not change any at all, but it will peak sooner. Overall and peak torque will increase as well.

wildcamaro

iTrader: (15)

^they hit the nail on the head..."no replacement for displacement"

big dave

When looking at cam choices for the larger motor, would I be looking for something with more lift, or more duration to take advantage of the extra cubes?

bww3588

iTrader: (49)

Depends on your heads, intake and exhaust. If you have crappy heads and intake, generally more duration with lower lift will leave more time for the cylinders to fill up and increase velocity at the same time. If you have awesome heads and intake, you can get away with lower duration and slightly higher lift and save yourself from having a huge cam wearing on valve train components.

Provide details of your parts.

IllusionalTA

iTrader: (9)

More duration, just give Bauer a call.. He wil setu up with a bad *** bump stick.. You won't be disappointed

Sales@Tick

iTrader: (3)

More torque, peak sooner, probably 5-10rwhp gain.

If you change the cam it will pick up power everywhere....how much will depend on cam timing.

speedtigger

iTrader: (16)

This has always been my experience.

IllusionalTA

iTrader: (9)

Can't go wrong with Martin either.. Both him and Bauer would be my goto cam guys..

Snkebait95

iTrader: (16)

If you have the same setup in a ls1 and a 5.3, the ls1s going to make 15-30 more horsepower

big dave

I'm currently using the PRC 5.3 heads along with the T2 cam. How well would this combo work with more cubes?

01ssreda4

iTrader: (96)

It should work as described above. I'd ditch both if budget allows (may not) and go bigger. If budget is tight then I'd keep the heads and have a cam done up by someone familiar with that combo.

adamantium

iTrader: (3)

350ci? Don't you mean 346ci?

big dave

^^ You are correct, I did mean 346. ^^
I have no problem going with a larger cam but I'm looking for reliability and longevity. I'm not looking for a max effort motor but I would like to see as close to 500 rwhp as I could get without having the motor on the ragged edge. My goal is to run at least 126 mph at full weight in warm conditions. It currently runs between 118 - 120 in the heat, making 426 rw, but the times in my sig were run in -1800' da.

adamantium

iTrader: (3)

I recently talked to Brian tooley and he really helped me out and set the record straight for what is needed to do what, he's been working on these cars since 01 (IIRC), he used to port for TEA and he def knows his stuff, i say PM him and see what he recomends, maybe he has some tricks to help pull power out of those heads you currently have!

Sales@Tick

iTrader: (3)

You for sure don't need a crazy camshaft to do what you want.

I would love to help you out by getting you the right cam after adding more displacement. Gains will depend on how big you are willing to go which will be determined by numerous factors.

Give me a shout if you'd like to know what I could do for your set-up.

big dave

Thanks Martin, I'll be sure to do that. The size of the cam really doesn't matter to me as long as it's streetable. I'm still able to get 26 mpg with my current setup but I'm willing to give a little in the name of more hp. I know I'll never get factory driveability, but I never thought the cam I have now would be so streetable. I soon found out it's all in the tune.