I am building a lt1 383, forged bottom end, my heads are AFR 195cc, what is a good cam to pair up this combo?

 

Hot cam or something similar, however your lacking details. M6 or A4? A4 rear axle ratio and stall converter? Street, strip, autoX or road race? Cam should match purpose and intended operation range. Along with you should be willing to make supporting mods if necessary for cam. No point to have a engine that makes peak power at 6500rpm that never turns over 2000. All major cam companies have techlines to help you select a cam, and of course they just happen to sell.

 

With 383, LT4 Hotcam would be the base I'd start from and go up from there, need to know what you're looking for exactly and the rest of the combination.

 

a good place to start might be to look at the cams GM Performance puts in their various 383 crate engines

 

..... I have a nice , lightly used Comp Cams XR 276 HR ... 224/230 @ .050 ... .503/.510 lift on 112 LSA ... $200 shipped .....

 

It depends on your goals. \

I'd consider the hotcam if your goal is longevity (via ease on valve train). With a hotcam, you'd run 100k+ miles without needing springs. (You might get that from other cams too...just that this cam has slower ramps).

TPIS sells a couple of more aggressive (higher lift/duration) that are still pretty easy on the valve train. If you want it more streetable, consider sticking closer to 220-225ish duration. If you want it lumbery and fast on the big end of the track, low-mid 230s.

That said, if your 195's are the newer Eliminator style, you can have a little of both. Those heads "act bigger" with a smaller cam than older style heads. That allows the opportunity to keep the valves closed a hair longer (less duration) but still pull in huge gulps of air when open.

The XR cam (offered above) would be an example of a great compromise. These cams are a bit more aggressive (lift) than the old-style TPIS grinds. Basically, they get the valve open/closed a bit faster via steeper ramps.

Make sure you match spring choice to the aggressiveness of your cam lift. Maintaining valve control is THE thing to consider. You don't need a smaller LSA with EFI. 112-115 is the norm.

Bullet cams and/or Comp can be a good source for conversations with techs to understand the choices. There are also good articles online on the subject of cam construction.

 

Basically, what he said!

 

I also have a lightly used Comp cams 07-305-8 cam. 220/230 .510/.510 on a 114LSA. I would sell for $200 shipped

 

My question is why didnt you think of this in advance...Do some research, it really isnt that hard, or difficult. It all depends on what you want the engine to do, how do you want it to perform? What is going to be the sweet spot in the RPM range, How do you drive your car?

lightly used Comp Cams XR 276 HR ... 224/230 @ .050 ... .503/.510 lift on 112 LSA ... $200 shipped .....

That would be ideal! only have to get some lifters, springs, a 1.6 ratio rocker rollers, and you will have a nice tidy little engine

D.