DeltaT

iTrader: (5)

Hi All,

I'm upgrading my Vortech-blown, intercooled 383 to a Motown block-based 434, and I am looking for cam suggestions.

I currently am very happy with the Comp Xtreme Street Roller in 230/236 @ .050"/112lsa/net lift .575/.584 in the 383, but adding 50ci is going to require at least a step up in cam.

Here are my top possibilities, all from the solid roller Comp Xtreme Street lobes:

236/242 on a 114

242/248 on a 115 or 116

236/248 on a 115

I'll be running the same T-trim and intercooler, single plane Holley EFI manifold, 72# injectors, Holley 950 Pro wideband EFI.

I'm keeping my current ported Edelbrock E-Tec 200 Vortec-style heads and 1 3/4" Hedman LT headers.

On the 383, I am making about 11# of boost, so on the 434 I figure I'll get around 8-9#.

Which cam do you like for this, or do you have another suggestion? Not switching from solid roller - I love them, so no hydraulic roller suggestions, please.

The main reason for this upgrade is that I felt I was running out of headroom on the GMPP 4-bolt block. Even with studs and a short fill, this block has its limitations, and I really didn't want to find them the hard way.

Thanks in advance,

Jim

LS1TECH is my favorite Forced Induction forum.

My site: http://home.mindspring.com/~jim_fisk/id1.html

INVISIBLEZ

iTrader: (45)

P.M. Inspector12, he's good with cam suggestions...

DeltaT

iTrader: (5)

Thanks, I'll do that. Anyone else?

Jim

DeltaT

iTrader: (5)

Someone else must have some big inch, FI experience with solid rollers...

All suggestions appreciated.

Thanks,

Jim

Tiago

iTrader: (27)

those cams sound very small for a solid... go bigger

DanZ28

iTrader: (5)

TTT for you, curious myself what would be a good solid roller.

Off topic, looking through your website, see you show a machine shop in Santa Clara, I'm not all that far off. Is he familiar with LSx engines?

Dan

DeltaT

iTrader: (5)

Sorry, Dan, he's not an engine guy at all. Maybe motorcycles, and he can make any part from scratch, but he doesn't run an auto machine shop.

Tiago, I always have good luck going a little smaller on cams rather than a little bigger. What would you actaully recommend?

Jim

DanZ28

iTrader: (5)

Ok, cool. I might check him out later anyway as I might need an custom bracket made.

ddnspider

iTrader: (26)

i like the 242/248 u posted.ive driven a 346 ls M6 car with a very similar cam except alot closer LSA and it was a bit much on that setup for driveability but on your setup i think it would be nice and make alot of power

DeltaT

iTrader: (5)

Well, I pulled the trigger and went with the 242/248 Comp Xtreme Street Roller lobes on a 115LSA. Also paid $100 extra for Hellfire rings. Now I'm thinking I should upgrade my headers from 1 3/4" to 1 7/8" to get the most out of this beast.

Jim