Quote:
Originally Posted by Husein-p
well
so i think with a good street cam like 0.490 valve lift and duration at 050 212 and lobe 110 can deliver 250 horsepower ! is this true ?
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With that amount of lift and duration you'll be in the 255-270 advertised duration area. At that point you'll also want better, lighter pistons because the engine characteristics will be Completely different. Here's a build I would recommend.
Head work:
1.86 intake valves
1.60 exhaust valves
Be sure to have a at minimum 3 angle valve job and make sure the bowl is opened up as well. No chamber relief will be required.
Lump ports.
Z/28 valve springs.
.030 shave off the head.
Block work.
.040 over forged aluminum flat top pistons. Ross is a good place to check. Tom Lowe does sell them for cheaper. Those will give you about 9.5.1 compression.
A good cam would be comp cams 268H 218@ .050 .499 lift on a 110 lobe center. That'll give you a choppy idle and good RPM range. Here's the cam spec number 61-244-4. Go to their sight and see their camshafts. They have some nice options. Custom grinds are available as well.
Stock rods balanced and refitted with ARP studs and bolts.
Crankshaft balanced and ground for sure.
Add a good intake and headers will a 390 holley or 500 edelbrock and HEI. You should see around 290 hp and 270 torque.
Larry aka Twisted 6 can give you some options as well. He's on this forum once in awhile.
Tom Langdon at Langdon's stovebolt will also have good advice.
Mike at Ravenswood Paint and Body.....hard to get ahold of but a good man as well. lol
Tom Lowe has done dyno testing so you could probably get some specs from him.