This got off into the weeds pretty quickly. If you are really going to run a stock converter, stock ex. manifolds 3.23:1 gears in a 383, forget the single plane manifold. Build as much compression ratio as your budget allows, use a dual plane intake of your choice with a 650-750V.S. carb., and don't over cam it. I have run stock manifolded 383's in 2 different 4 door (66& 68) Newports. Both ran mid 15's at 90ish m.p.h. with less than 8:1 compression,2.76-3.23 gears & stock heads.. I used a cam dynamics 266 energizer(.440" 266 210@.050") and a Crower 260 H.D.P. ( .456"-477" 260-267 212-218@.050). I liked the energizer better as it had tighter lobe sep. and better low end.A 230@ .050 cam and a single plane will be a turd below 3000-3500 R.P.M.
I agree, we ended up far out in the weeds LOL
Yes, I'm really gonna do what I stated from beginning. Maybe not the DP4B since it's not for spreadbore, which I'm gonna use.
I have never even considered a single plane for this build. This engine will need long runners.
I'm going to keep the compression pump gas friendly. We can get 93.5 oct here in Sweden (<5% ethanol). Cylinder pressure around healthy 160-170 psi is what I'm aiming for, that will leave some margin.
What I asked for was camshaft input for this specific build.
My thoughts of a cam are duration around 220 and maybe a little more on exhaust, lift as much as .500 and LS around 110. Talking hydraulic flat tappet now. But what do I know? LOL
It would be interested in some input - what cam and why?
I wish I could tell you what cam was used in this 383 engine but I cannot. Most likely it was some stock replacement hydraulic cam. The engine was built in 2002 and had about 10 miles it.
However we did run it on our engine dyno today 7/31/2020.
Fired it up with the stock iron 4150 type dual plane intake with a casting number ending in 301 and then changed to a Holley Street Dominator. The carburetor used was a 1406 Edelbrock.
RPM......Iron 301 TQ/HP......Street Dominator TQ/HP
2500.....349/166..................308/147
2700.....343/176..................310/159
2900.....351/194..................330/182
3100.....364/215..................343/202
3300.....361/227..................349/219
3500.....356/237..................350/234
3700.....349/246..................350/246
3900.....338/251..................350/260
4100.....336/262..................351/274
4300.....325/266..................348/285
4500.....315/270..................344/295
4700.....312/279..................338/303
4900.....298/278..................328/306
5000.....284/276..................320/305
END TEST
