anyone using AFR's milled to 59 cc, TSP 231/237 on a 346?
03-19-2005, 10:58 PM
#1
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anyone using AFR's milled to 59 cc, TSP 231/237 on a 346? We also have .040 cometics. With regards to valvetrain geometry, any firsthand experience with size of shims and length of pushrods would be great.
We have .060 shims in right now, and 7.350. The lifters are not pumped up yet, however. as they are brand new. I plan on getting the motor together, running for a few minutes, then checking the wipe pattern, and then if/when that is correct, selecting the proper length pushrod to get the preload correct.
TIA
We have .060 shims in right now, and 7.350. The lifters are not pumped up yet, however. as they are brand new. I plan on getting the motor together, running for a few minutes, then checking the wipe pattern, and then if/when that is correct, selecting the proper length pushrod to get the preload correct.
TIA
05-20-2005, 09:06 AM
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results We cut pistons, installed the milled afr's and clearance is fine. I may be changing pushrods. those 7.35's are shimmed and are chattery as heck though, even though everythings tq'd right. Maybe nice rockers next.
car pulls like crazy though
car pulls like crazy though
05-20-2005, 10:36 AM
#4
Originally Posted by Bull_in_a_china_shop
Maybe nice rockers next.
car pulls like crazy though
car pulls like crazy though
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05-20-2005, 03:41 PM
#8
Why are you running .060" shims and shorter pushrods? If your goal is to put the pushrod at the top of the plunger, seems like it would have been easier to do one or the other, but not both.
You've lost .040" in rocker height due to milling and thinner gaskets. A 7.35 pushrod should be .010" higher in the plunger than stock. Adding a .060" shim will make your pushrod .070" higher in the plunger and I'm not sure, but it sounds like that's too much to the top. It will most likely rattle like crazy. If your goal is to get the shallowest plunger depth possible, you'll probably still need less than a .060" shim. If your goal is to have close to stock geometry, either use a .040" shim and stock 7.40" pushrods or keep the 7.35" pushrods and go with no shims. All of this IMO of course.
You've lost .040" in rocker height due to milling and thinner gaskets. A 7.35 pushrod should be .010" higher in the plunger than stock. Adding a .060" shim will make your pushrod .070" higher in the plunger and I'm not sure, but it sounds like that's too much to the top. It will most likely rattle like crazy. If your goal is to get the shallowest plunger depth possible, you'll probably still need less than a .060" shim. If your goal is to have close to stock geometry, either use a .040" shim and stock 7.40" pushrods or keep the 7.35" pushrods and go with no shims. All of this IMO of course.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.