Recent content by 273

Never said it wouldn't just ruffly how much gph he needs, if a stock fuel pump has that covered kewl.

Hp x .08 = gph 350 hp x .08 = 28 gph

250 cfm was just an example, same thing applies for any heads usable peak cfm, point was the how much the port size could very and still have acceptable average fps.

If a head that flows 250 cfm and it's in the 162cc - 187cc range then it's average fps should be in the 260-300 fps range. Which according to the FPS list should make for a Very good HP & TQ combo. Point was that's a fairly wide port volume window and most 250 cfm heads are gonna fall in there...

I'd go with something around 206-212 intake duration, 108-112 lsa, lift depends what's available but basically the highest you reasonably can get.

If you go with pipe max recommend average port velocities (fps list below) 260-300 average fps = Very good HP & TQ, if you put that into port sizes, eg.. would be around 250 cfm = 162 - 187cc, 300 cfm = 194 - 224cc that's a fairly big window and that's for very good, add in the windows for good...

I agree, Richard Holdener done a bunch of head shootouts of various port volumes and hasn't found Low End Torque (Power) changes much, but possible that throttle response does, I feel people confuse driveability with a lack of torque which for various reasons don't make sense to me.

I'd say it depends on the individual, even good information can be noise if you could careless about it and bad information can be valuable in not what to do and some information don't become valuable until you learn something else.

I see what your saying but I never said they should, I just find it interesting what people can do with them, I'm in the more information the better camp. As for it leading people astray unfortunately that's up to them to work through, even good info leads people astray they can become over...

Engines that peak 6,500-7,000 rpm's on the dyno always seemed to have an ideal power curve to me for a performance street strip engine, but a lot say they will have a terrible bottom end torque (hp) even though I don't usually see that in the dyno results.

How high in the rpm's do you have to turn to do low 12's with a 273 ?

I don't agree with the overall build, I still find it interesting what people can get out of stock parts.

The only performance engine I could see using 273/318 heads on (stock or ported) is a 273.