Need some cam experts.

[bcjjones]

I’ve decided I cant help myself and I’m going to swap cams on my Weiand 177 powered 383.

I feel like the current cam, a retro fit crower 238/240 .555/.559 on a 110 lsa, is just robbing power potential and I feel like with almost 20 degrees of cam overlap im getting a lot of exhaust reversion. Plus, im having to really spin the blower to get any PSI out of it.

I know psi is just a measurement of what isn’t getting through the engine, but I would like to spin the blower less rpm and get the same pressure or more.

The two I’m looking at are Howard’s cams but open to other suggestions. Both have an overlap of just 2 degrees.

One is 235/233 .544./.540 on a 116LSA and the other is a 225/235 .525/.536 on a 114LSA.

The motor set up is a fully forged 383 with 200cc runner heads, rings gapped for boost, carb motor in a 95’ Silverado. Curious on opinions?

 

[RDF1]

Really your best option is to call and just have one cut for what you want.
I deal with Cam Motion 99% of the time and they are very good at getting the right cam the first time on the trucks I build for folks

 

[alignman88]

The 200cc intake runners of the heads should be good for 500 hp but the cam must match the heads capabilities. As stated above call the cam companies with cylinder head specifications. They can get all the juice for your squeeze with the right information. I’m running 195 intake runners with 64cc chambers in a .60 over 383 (388cu inch) and that limits me to 435-450 with hydraulic roller that’s 234/238 @.050 and 539/548 lift at the valve 112 lobe separation on 107 intake/117 exhaust centerline.

 

[Gramps]

Smaller pulley on the blower an option?
Otherwise yeah like mentioned call the cam company and have your exact engine specs at the ready and they should be able to help you out or help you figure it out. And I mean exact engine specs “gapped for boost” doesn’t really mean much. Need the compression ratio and other detailed info.

 

[CrustyJunker]

As Gramps said...What's your static compression ratio right now and what RPM are you taking it to? Although your newer cam with the wider lobe separation is much better for your blower's efficiency, your cylinder pressure will probably go up some. Also, how much boost? (8-10 PSI guessing?)

The Weiand 177 looks like a nice blower, but the amount of CFM its capable of may be limited on a 383 cubic inch engine. Just some thoughts!