I just picked up a 69 windsor block that it is .040 over and o ringed. I have a eagle forged crank and h beam rods. I also have custom diamond pistons final comp will be around 13:1 depending on which head I use. I will be using a super victor intake, a pro systems carb and a custom cam once all my parts are selected. The car will be shifted around 7500 rpm and will run on 110 octane fuel. I currently have a 306 that I will be selling when this motor is ready to drop. My 306 has vic jr heads on it now so Im wondering which will flow better afr 225's out of the box or the vic jr's with heavy porting. Either way its going to cost the same. Sell the vic jr's for $1000 and buy the afr's or spend $1000 on porting?
jimmy8541
Honestly, I think both are on the too small size as your asking for what your wanting.
Your talking about 7500 RPM on 410 cu in, and CNC ported box 225's are good for about 6000 on that sort of displacement.
Now hand ported max effort 225's that would be a differnt story, but out of box.
Your talking about desired/required 270cfm to 300cfm per runner.... and a 220 cfm exhaust desired, although it could be effective as low as 190cfm... with a crutching cam.
Your talking about 7500 RPM on 410 cu in, and CNC ported box 225's are good for about 6000 on that sort of displacement.
Now hand ported max effort 225's that would be a differnt story, but out of box.
Your talking about desired/required 270cfm to 300cfm per runner.... and a 220 cfm exhaust desired, although it could be effective as low as 190cfm... with a crutching cam.
Personally if you have to do a lot of porting and change other things for that matter in the heads to match the potential of the AFR's.... sell the Vic's and get the 225's. In the other hand I've seen very impressive times out of Victor headed stroked windsors. So whichever is more cost effective and you can put whatever you save in other parts.
Doesn't mean the meet the needs for all race engines out there.
Yates and Blue Thunder heads flow 310cfm..
But the AFR's can be ported to do very well.... but out of the box, you get good, not great performance.
Yates and Blue Thunder heads flow 310cfm..
But the AFR's can be ported to do very well.... but out of the box, you get good, not great performance.
ported vic. jrs.... i have a set of old style high ports that are ported that flow better than the afrs.... don't get me wrong afr is a great head out of the box, but you can fly with a set of vic jrs..... you really wanna fly spring for a set of VOCTORS and get those bad boys hooked up!
The BT are canted valve heads, not sure on the yates, might have to have clearance notches at the deck for the large valves. But if your looking at monster flow...
4.125 would be better (AKA DART...)
4.125 would be better (AKA DART...)
the AFR footnotes do not say the numbers are for hand ported heads and they are both "race" CNC versions.
Very misleading if it is true that those numbers are for hand ported versions.
Very misleading if it is true that those numbers are for hand ported versions.
Here we go again...
Let's kill this before the internet dweebs go spreading more misinformation...
The flow numbers listed on AFR's web site are from the pattern heads and are representative of what the actual mean flow numbers are on each cylinder head. As cutters wear, fixtures deflect and taking into consideration typical tolerances, the number will be slightly different. However, these deltas are no more than what is seen from variation in flow numbers from bench to bench, operator to operator... basically ... no big deal.
Also... unless you've been hiding under a rock for a decade, raw flow numbers are only one part of the power producing potential of a cylinder head. Many times I've tested the latest "wonder head" with huge flow numbers, only to have horrible noises coming from the runners as well as disappointing HP numbers.
A couple of years ago Darin Morgan published an article regarding some new Pro Stock head that flowed huge numbers. They were down over 200 HP from their lesser counterparts. Using wet flow technology, Darin noticed a problem and moved the spark plug location .300" from the original location and found the lost HP.
Again, for those who live and die by a flow bench number ... dry flow is only one part of the equation.
/back to work...
Ed
Let's kill this before the internet dweebs go spreading more misinformation...
The flow numbers listed on AFR's web site are from the pattern heads and are representative of what the actual mean flow numbers are on each cylinder head. As cutters wear, fixtures deflect and taking into consideration typical tolerances, the number will be slightly different. However, these deltas are no more than what is seen from variation in flow numbers from bench to bench, operator to operator... basically ... no big deal.
Also... unless you've been hiding under a rock for a decade, raw flow numbers are only one part of the power producing potential of a cylinder head. Many times I've tested the latest "wonder head" with huge flow numbers, only to have horrible noises coming from the runners as well as disappointing HP numbers.
A couple of years ago Darin Morgan published an article regarding some new Pro Stock head that flowed huge numbers. They were down over 200 HP from their lesser counterparts. Using wet flow technology, Darin noticed a problem and moved the spark plug location .300" from the original location and found the lost HP.
Again, for those who live and die by a flow bench number ... dry flow is only one part of the equation.
/back to work...
Ed
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