Quote:
Originally Posted by blykins
What small blocks were turning in full race cars and in NASCAR has zero bearing whatsoever in this situation. This is a street car with a high rearend gear ratio, on pump gas, with low rpm manners required.
There's also one key difference: for the average home builder to say that he's turning 8000 rpm either means that he's got his distributor wired for a 6 cylinder, or he's making peak power at 5000 and he's turning it 3000 extra rpm. You wouldn't believe how many guys I run into that think they are making power at 8000 rpms....  Do you guys know how much head and cam is required to peak at 8000?
We need to get back on track here. Even if I built a 302 to turn 7000 and make peak horsepower there, it's not a good match for XB's application.
XB...
Again, no one is pro-stroker or pro-revver. I'm both. I use both. I cherish both. The point here (and I need to really type this in all caps) is to build the engine for the application!!!!
An engine that makes peak horsepower at 7000-8000 has nothing down low! Especially very small displacement engines! |
All very good points.
Some more info for Glen.
When selecting a cam, the quoted power range from the cam grinder is, eg: 3000 - 6000 rpm, not it's min and max but it's best operating range.
No cams are have a range of idle to 7000+ rpm.
And the higher up you go, the narrower the band becomes.