Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Need help with first 383 build
View Single Post
  #17 (permalink)  
Old 07-02-2012, 02:15 PM
seanphelps321 seanphelps321 is offline
Registered User
Join Date: Jun 2012
Posts: 8
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Originally Posted by my87Z View Post
i had to go back and look at both cams to see why i would have recomended the crane cam over the lunati cam. I'm actually a bit suprised that i recomended a crane cam, there is nothing wrong with them they are of a very good quality i just dont look at them very often, i think i picked it solely due to it's profile.

the crane cam has a bit more duration which the 385 will like, the lunati has a tad bit more lift but that isn't enough to be felt. the reason i picked the crane cam is because it's ramp rates are a lot more friendly on a hyd flat tappet valvetrain then the lunati cam's ramp rate. your ramp rate in laymens terms is the difference in duration @ .050 and the advertised duration.
ex. crane cam: 234-296 which is a difference of 62, this is basically how fast the valve opens and closes.
lunati cam: 227-268 which is a defference of 41, this means that on the lunati cam the valve will be opening and closing (.000"-.489"-.000") in 2/3rds the time of the crane cam. 41 difference is absically what you will see on a solid flat tappet cam and is VERY aggressive. which an aggressive ramp rate means extra stress on the rest of the valvetrain.

now the crane cam acutally has more of a slow ramp rate, 62 is a good bit. if i were to build another hyd flat tappet 383 then i would look for a ramp rate in the 50 range. here are a few that i like a bit better than the crane cam, and i certainly like them better than the lunati cam.

COMP Cams 12-212-2 - COMP Cams Magnum Hydraulic Camshafts - Overview -
Lunati 00010 - Lunati Hydraulic Flat Tappet Camshafts - Overview -

this one would probably be my choice, i am a big fan of howards valvetrain products, i have been using them for quite a while with absolutly no problems and their customer service is second to none.

Howards Cams 112141-10 - Howards Cams Hydraulic Flat Tappet Camshafts - Overview -

and as i mentioned before, i wouldn't go with the scoggin dicky vortec heads for 800.00 when the 180cc RHS pro action heads are the same price and are proven to flow better and flat out perform better.

the Eagle kit you chose is just fine, i've used the 4.030" kit before and it worked great for me. if you match the howards cam, a nice performer rpm intake, a simple holley 750 vac sec carb, cheap HEI distributor (60K volt), with those RHS heads, and a decent set of headers and exhaust then you will be sitting in the 410-425hp rane but the kicker will be the 440-460tq you will make, all while using pump gas.
So how much of a difference would I see in the Howards cam vs the Lunati one I posted? I already have the Lunati, got it for a great deal from another guy. I can always just sell it to someone else and get another cam if it would be that big of a difference though.

Now if I go with those RHS's will I need a different intake than the one I posted? I posted an Edelbrock 7516 performer RPM air gap. But it's designed to fit vortechs. Does that matter?

Also about the distributor, I don't really know anything about picking the right one. You said HEI. But what about trigger style, advance type, or computer control compatible? What should I look for in those areas? And I'm sure the gear material matters, but with that I'd need to know the material of the cam, right?

EDIT: And yes, I'm on a budget. But I'm actually using this summer to build the engine, get the tranny and all the stuff needed for that, and the rear end and all that I need for that. I'm planning on doing the whole swap at either spring of next year or beginning of summer of next year so I can use the whole summer to make sure everything runs right and break it in. So I don't know my full budget yet, but it's definitely enough to get what we've been talking about. But yes, if I could afford heads like AFRs or the like, I'd definitely go that route.

Last edited by seanphelps321; 07-02-2012 at 02:20 PM.
Reply With Quote