600 rwhp 402 anyone have a good idea for a good h/c combo?
03-04-2013, 05:28 AM
#21
I had a set of ported AFR 230 V2's flowed, they are the improved AFR 225. They were on my 416 with a 243/247 .623/.623 114+2, ported Fast 102 & 102 TB. Besides being the most god awful POS to drive I've ever owned it only was in the low 500 RWHP. The flow numbers backed up the low power output, so you won't get there from here.
03-04-2013, 08:45 AM
#22
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I had a set of ported AFR 230 V2's flowed, they are the improved AFR 225. They were on my 416 with a 243/247 .623/.623 114+2, ported Fast 102 & 102 TB. Besides being the most god awful POS to drive I've ever owned it only was in the low 500 RWHP. The flow numbers backed up the low power output, so you won't get there from here.
03-04-2013, 08:49 AM
#23
I had a set of ported AFR 230 V2's flowed, they are the improved AFR 225. They were on my 416 with a 243/247 .623/.623 114+2, ported Fast 102 & 102 TB. Besides being the most god awful POS to drive I've ever owned it only was in the low 500 RWHP. The flow numbers backed up the low power output, so you won't get there from here.
03-04-2013, 06:08 PM
#28
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Just changed out my 90mm TB for a NW 102 and moved to a 3" catback. Hoping to retune and dyno soon to see how much more it added.
03-04-2013, 06:52 PM
#31
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I made 505 on my 402... Tsp cam, ported 243s, ported fast 102, 102 tb full bolt ons and 1 3/4 headers through a 2.5 inch exhaust.. But aiming for more with Trickflow 235s and custom cam.
03-04-2013, 06:52 PM
#32
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Ya, they are the big bore 62cc cambers. Mine are actually blemished units made from the 225 cores. I know one of the big things with AFR heads are not the top end flow, it's about the mid range and total flow numbers.
03-04-2013, 08:24 PM
#34
You can look at all the specifics in my signature block for 550 plus at the tire. I had 250cc intake runners on the heads with 2.1" valves. I considered what it would take for 600 at the tire and my feeling is bigger 275cc plus ports, 2.160 plus intake valves, a very large camshaft, big exhaust and a big, big intake. Oh, and my numbers were on 93 octane.
My drivetrain loss was a quite accurate 14 percent as measured on the stock GTO.
Figure the NASCAR guys make 800 plus on 358 CI, so do what they do. Most of their work is on their 400 plus CFM heads, and they do wind the engines up over 8,000 RPM.
My drivetrain loss was a quite accurate 14 percent as measured on the stock GTO.
Figure the NASCAR guys make 800 plus on 358 CI, so do what they do. Most of their work is on their 400 plus CFM heads, and they do wind the engines up over 8,000 RPM.
the top end on those heads is crazy, and thats like an inch of valve lift at 9k rpms
with enough money you could make a 600 whp 402, but you could save a lot of time andoney and add some longevity with bigger cubes or boost
03-06-2013, 12:42 AM
#35
550rwhp is a stretch as well. 515-520rwhp is a well performing 402 on pump from what I've seen on the majority side of the discussion. There are a few above average performers out there but with the parts OP is debating on using he will not be an above average performer IMO.
Sorry man, I dont see 600 rwhp out of yours.
