OLD Modified Corvettes

[randy wilson]

Never mind Dick. I got it.

[Dick Butler]

Randy I am hoping all the others expressing thoughts will mail as well...

[randy wilson]

Just sent it Dick.

[randy wilson]

Joe, that was a great article at competition plus. Great article. But the similarities are close, but not the same. They had 4 manufacturers, with 4 totally different cylinder heads. Don't know about American motors, and mopar, but, for instance, I believe the head of choice for GM was the 461X. For Ford, it naturally would be the canted valve Cleveland. I'm a little familiar with both, and the X head flowed around 220 out of the box, and with a great valve job, and what matching was involved, never exceeded 240 cfm. The Cleveland, out of the box would go 285 cfm. I don't know what the mopar 18 degree stuff did. There in lies the problem. Brodix, if anyone cares to look, are as follows. (And I'm close here, not exact.) Chevy, 269 intake, 179 exhaust, Ford, 272 intake, 202 exhaust, Mopar, 270 intake 200 exhaust. That class would still be going today, if they had something like that. Just my opinion. If you let the Chevy use external port plates, 1\2 inch thick, with no internal mods, the exhaust flow goes up to close to 200 cfm.

[randy wilson]

Here's the exact flow numbers at .700. Chevy, 269 intake, 182 exhaust, Ford, 270 intake, 202 exhaust, Mopar, 269 intake, 198 exhaust. Gentle men, start your engines!

[joespanova]

I'll vouch for the addition of port plates as my heads were tested years ago without the plates ( I have the numbers ) and now Larry Meaux has retested my heads and there was a considerable difference with just the plates. The plates were actually added years ago.
I'm anxious to see what he can do to improve them ( heads ).
I'd still prefer something replicating the old Modified Production cars of the late seventies to early / mid eighties.

[joespanova]

This car seems to get plenty of "ink" so I'll use this as a perfect example:

http://bangshift.com/gallery/the-gra...o-gallery.html

http://bangshift.com/blog/car-featur...69-camaro.html

[Dick Butler]

The vette was even better....

[randy wilson]

Beautiful car Joe! And would still look, and sound great with a spec say, 321 c.i.d. The challenge in my opinion, would come from the short block design, intake internal porting, cam choice, carb choice, gear ratio, and chassis set up. The challenge would still be there, and the hard workers would still be rewarded. It just takes the money, and guess work out of the heads. Valve jobs would be a MAJOR challenge. Just think, we would NEVER have to search for a better head, or the head porter of the week. We'd look at cams, and intakes REAL HARD. I've ran the spec head, and the thing I found consistently with 3 sets of Chevy heads, and 1 Ford set, was no 2 ports on the same head flow the same. But, it's the same challenge for everyone. The set I ran the best with flowed 258 on the best port, and 253 on the worst port at .700. I did see one head that flowed 269 on a couple of ports, but were slower on the car. Go figure. The way I look at that is, if you think those flow numbers got you beat, you were real close to winning.