AFR heads,spring life and high lift cam.
#1
AFR heads,spring life and high lift cam.
I have a gt7 lingenfelter cam not installed but since was going up to a 408 was thinking going up on the cam to gt11.Its mid 600s lift. I am also getting afr 225 heads and of course would get the upgraded springs.My car is a street car and rpm limit I would think would be set at 6500 max or is that too high for a 408? I put maybe 5000 miles on my car a year.So am I going to have to be changing out these springs every couple years? Not a fun job on the ls1 cars with the engine half under the cowl. Or should I go to the gt7 with mid 500s lift and maybe up that a bit with say some 1.8 rocker arms? That would still keep me under 600 I think.
I just figured the bigger displacement engine could use the bigger cam and see APS is running the gt11 in their little 346 with good results. So is the rapid spring wear thing overrated? Can I get 25,000 miles or about 5 years driving out of the springs at least. Talking the 8019 think upgade that you can get on the afrs.
I just figured the bigger displacement engine could use the bigger cam and see APS is running the gt11 in their little 346 with good results. So is the rapid spring wear thing overrated? Can I get 25,000 miles or about 5 years driving out of the springs at least. Talking the 8019 think upgade that you can get on the afrs.
#2
Also do the afr heads and the upgrade spring option come with titanium retainers? If not what ones will work part numbers? I have some titanium retainers that am using on my current 918 springs.Will they work? Is titanium retainer really that useful to help the engine rev quicker or is that pretty much overrated?
#4
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I have AFR 225s and I *had* the "upgraded" springs. After a nice break-in for the new motor and valvetrain, they didn't hold perfectly (at 11 psi on a 346 with only 224/244/114 0.588) and I had some power fluctuation at > 4500 rpm. Switching to Patriot duals fixed that problem. YMMV.
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#12
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FWIW, I have had the Patriot Golds on my car since last summer with a .641/.646 lift LSK-lobed cam revving to 6600-6800 and haven't had any issues with them.
I just picked up whatever set of AFR's is the same as the Patriots to use in the motor for next year. Not sure what part number these were, but they are EXACTLY the same as the Patriots I've got on the heads currently. With the D1SC, the car will more than likely be cammed with the LPE GT2-3 next year which is only .580ish lift. I'll have the springs shimmed accordingly.
Max lift the springs can handle is .650" and are very stiff.
I'm only replacing my springs this year because we're putting my old motor in my buddy's car. Otherwise, I'd keep them on for another year.
I was planning on replacing my springs every 1 or 2 seasons (max) with the .64x lift cam. Car gets 8-10k throughout the summer months and a couple times at the drag strip (3 times this year...the one day I put 26 passes in, then 4 passes each of the other two days).
Most important thing for these stiff springs....HEAT CYCLE THEM!
I just picked up whatever set of AFR's is the same as the Patriots to use in the motor for next year. Not sure what part number these were, but they are EXACTLY the same as the Patriots I've got on the heads currently. With the D1SC, the car will more than likely be cammed with the LPE GT2-3 next year which is only .580ish lift. I'll have the springs shimmed accordingly.
Max lift the springs can handle is .650" and are very stiff.
I'm only replacing my springs this year because we're putting my old motor in my buddy's car. Otherwise, I'd keep them on for another year.
I was planning on replacing my springs every 1 or 2 seasons (max) with the .64x lift cam. Car gets 8-10k throughout the summer months and a couple times at the drag strip (3 times this year...the one day I put 26 passes in, then 4 passes each of the other two days).
Most important thing for these stiff springs....HEAT CYCLE THEM!
#16
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From what I understand the AFR 205s come standard with the older style patriot 'gold' dual springs or similar. The 225s come with the 8019 which may or may not be the same as the 'new' patriots. I dont keep up with the patriot stuff but when you buy used heads and arent sure what springs you have its best to have them checked and see what the seat/open pressure is. If you go to AFR's site they list the specs for the standard 205 springs and the 225 springs. But that doest mean someone hasnt changed them along the way..
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I am running -28cc dished pistons, so static cr will be still under 9:1
#18
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I went with the smaller bore AFRs and the 5.7 MLS gaskets for that very reason, I wanted the fire ring to be on the cast iron sleeve and not on the aluminum like the 6L and larger gaskets. I found that with the 6.0 gaskets they were eating into the block pretty well right outside the sleeve, dont know whether that really hurt anything or not but the more aluminum and more gasket would make for a better seal one would think.
I didnt realize the 62cc versions were available, I know they were delayed for a long time. Why not just get the small bore 225s and not worry about it, few CCs wont make a huge difference and you can always have them opened up down the road for a larger bore.
#20
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Time to save up for that LSx
Thats what Im gona do at some point next year, at which point my heads will be ideal.. Unsure of LSx, or LS2....I dont want the weight, but the strength, and long term ability of iron would be nice.
Thats what Im gona do at some point next year, at which point my heads will be ideal.. Unsure of LSx, or LS2....I dont want the weight, but the strength, and long term ability of iron would be nice.