520T heads ???

Dwight Southerland · 12-08-2010, 10:17 AM

Here's a different perspective since I have flowed over 100 different 520 cylinder heads over the years. Back "in the days" there were some ingenious folks who understood the psychology of numbers and their effect on the racer's mind. Sometimes a truly odd part in a common pile could be personally modified for an advantage and then the superiority be attributed to its oddness. If most everybody's 520 heads were 130 cc and yours were 140 cc, the argument is easier to swallow if yours have markings that indicate a different origin. That's not always true, but cases like the 461X heads can be used to further substantiate a new legend. However, 'T' heads are consistently a good choice, if you get my drift.

FED 387 · 12-08-2010, 12:13 PM

OK so ya try to psych em out huh???--anyway we have both 520 USA heads 520T heads and a pair of Canadian 520 heads available---of the 3 heads which head "might" be the best head performance wise and which head would you flow first to see if it is/was better than the other 2--follow your thinking on the 461x vs 461 head can see the difference there, there is definately a difference in the port sizes but is there a disimilarity between the 3 "types" of 520 heads even tho they all carry the same part number or is it just something imagined. thanx FED387

12-08-2010, 10:17 AM	#1
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 2,002 Likes: 64 Liked 783 Times in 195 Posts	Re: 520T heads ??? Here's a different perspective since I have flowed over 100 different 520 cylinder heads over the years. Back "in the days" there were some ingenious folks who understood the psychology of numbers and their effect on the racer's mind. Sometimes a truly odd part in a common pile could be personally modified for an advantage and then the superiority be attributed to its oddness. If most everybody's 520 heads were 130 cc and yours were 140 cc, the argument is easier to swallow if yours have markings that indicate a different origin. That's not always true, but cases like the 461X heads can be used to further substantiate a new legend. However, 'T' heads are consistently a good choice, if you get my drift. Last edited by Dwight Southerland; 12-08-2010 at 10:19 AM. Reason: Addition

12-08-2010, 12:13 PM	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,428 Likes: 560 Liked 335 Times in 182 Posts	Re: 520T heads ??? OK so ya try to psych em out huh???--anyway we have both 520 USA heads 520T heads and a pair of Canadian 520 heads available---of the 3 heads which head "might" be the best head performance wise and which head would you flow first to see if it is/was better than the other 2--follow your thinking on the 461x vs 461 head can see the difference there, there is definately a difference in the port sizes but is there a disimilarity between the 3 "types" of 520 heads even tho they all carry the same part number or is it just something imagined. thanx FED387