Quote:
Originally Posted by Myself
I just looked up that cam.........waayyy wrong for an aluminum headed 383!! I have a slightly bigger cam in my 9.5:1 iron headed mild 305!
Change to a tall dual plane and a much larger cam and you won't be wondering where your power is.
I have a feeling if we lined up with my little 305 at a stoplight you'd be VERY disappointed in your power.
The motor as a whole is built well, take advantage of it.
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Quote:
Originally Posted by geezer#99
Could you share your theory on why that cam is way wrong?
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I'd like to hear the theory as well.
Specs:
270/278
217/225 @ .050
.495/.500 w/1.5's
110LSA
That combo should offer plenty of cylinder pressure for low end grunt. I didn't do the math on the combo but can. I would also recommend a dyno session if possible. A 2nd set of eyes going over everything might not hurt as well. Sometimes someone else will see something differently.
*EDIT*
Quick calcs w/some guestimating:
4.030 bore; 3.75 stroke; 5.7" rod; flat-top/6cc valve reliefs; .039/4.10 bore head gasket; .025" deck clearance; 64cc heads
With a mild cam like that (34.5 IVC) & the combo mentioned; compression numbers 'suggest' around 10.4:1 static/9.18 Dynamic compression.
The heads should still work just fine. The intake while 'small' for a 3.75 stroke SBC would still work but it won't offer full top end potential. Below 3500rpm? It should be very close to the RPM series of intakes. Calcs suggest ~400hp/5krpm based on 250cfm intake flow @ .500 lift. So if that's achievable, there's something possibly not set-up correct.