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#41
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Quote:
Journeyman thinking with all variables being the same, seat pressure, ramp speed, duration, lift ... ....you have a hammer on a nail.... take it back .016, strike the nail. Then take it back .030 and strike the nail. The difference in the amount of wear on a valve train is almost double. I don't believe Mr. Jones will get my business. Another thing overlooked on SR roller lifter and cam wear is the side clearance in the link bars. That will ruin a build for sure.
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1963 Cat SD Clone (old school) streeter 1964 GTO post coupe, tripower, 4speed (build) 1965 GTO 389 tripower, 4 speed, driver 1966 GTO dragcar 1966 GTO Ragtop 1969 Tempest ET clone street/strip 1969 GTO Judge RA lll, auto 1969 GTO limelight Conv. 4speed go and show (sold) 1970 GP SSJ 1970 GTO barn find..TLB…390 horse?….yeh, 390 1972 GTO 455 HO, 4 speed, (build) 1973 Grand Safari wagon, 700hp stoplight sleeper 525ci DCI & 609ci LM V head builds Last edited by J.C.you; 04-20-2020 at 12:06 PM. |
#42
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Corona
Well, bummer. I'm being told by my builder that the IAIIa blocks are on back order due to manufacturing shut downs over the COV19 thing. I'll have to divert my attention back at the fuel system and transmission.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#43
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Worth reading this Jones line again.. lol Quote:
I just created two lobes with only a different ramp (lash) height. .012 lobe lash Seating velocity 0.00056396 ------------------ .024 lobe lash Seating velocity 0.00056396 Last edited by pastry_chef; 05-09-2020 at 10:43 PM. |
#44
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molnar is out of 4.500 stroke cranks went to order one Friday
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2008KRE Q16 Winner 2014 atco raceway doorslammer winner 86 grand am tube car 8.95 @152 455 eheads solid flat tappet cam Hoffman Racing building and racing Pontiacs for 35 years |
#45
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Good day everyone,
It's been awhile since I posted an update. Some really long delays due to this COVID19 thing. The block, crank, rods and pistons have arrived. I ended up going with a Northwind Intake/Butler 340 head combo on the top side and those should be here in a week or so. The long delay has really been a good thing. I've had a chance to think things through and (again) ask myself what I a really want/need. After talking with my builder once more, and realizing my 90% weekend street use and occasional track time, the cam selection has come down to a hydraulic roller with this profile; 248/254 @ .050, 618/638 lift 112+4 LSA The engine builder seems to think this will have some really good street manners and still leverage a boat load of torque and should still hit 650 hp. Any thoughts? I've decided to retain the 3.55:1 rear gears for now. I may revisit that at a later date. Right now I'm focusing on getting a TH400 built up with a new converter.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#46
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Should be stout!
Using the EFI on it?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#47
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I am using EFI. I'm going with the Holley xFlow 900 cfm version.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#48
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My 517 @ 10.8:1 has a very similar cam/head/intake package and had power peaks of 4300 TQ and 5900 HP. It will pull past 6000 easily. It idles at 800 in gear with a 4000 stall converter. 3.42 gears are plenty so your 3.55’s should work well. With the bigger engine in your lighter car you could probably gear it up some and not loose any performance.
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
#49
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Quote:
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#50
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And note my comments regarding the intake in post #22
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#51
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This is all very reassuring. This should be a fun and reliable motor. Thanks for the input everyone.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#52
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Have you used any of the dynamic compression caculators to see where you at with the new cam?
https://www.gofastmath.com/Compressi...tio-Calculator Thanks |
#53
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I thank you...no I have not. Thank you for the link. I'll see what I get when I plug the numbers in. The builder is telling me CR should be just a touch over 10.5:1.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#54
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Remember, you will need all the safety equipment to run in the 10s: rollbar, SFI balancer and flexplate, non SFI engine diaper, trans shield/blanket, belts etc unless you only want one lap down the track. What is the bore, stroke, gasket volume, piston volume and head chamber volume? Will it be zero decked?
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
The Following User Says Thank You to AG For This Useful Post: | ||
#55
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I thank you...
A new harmonic balancer and flexplate are in the materials list. The old transmission shield may be too old. I think those things actually have an expiration date on them where SFI is concerned (I'll have to check on that). As for the other specs, I'll see if I can get those and post them. Thanks for reminding me of the SFI stuff.
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#56
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What cubic inch?
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#57
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535
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1968 Firebird IAIIa 522 340 E-heads Northwind with XFlow TBI 4L80E 3.50:1 Rear |
#58
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Nice setup! I just got my pretty much the same 340 butler heads delivered for my forged 461....my build is very close to this even the cam specs......the only difference is the cubes and don’t have aluminum block....I am also shooting for 650hp so we’ll see how it goes
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#59
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If you have the 340/350 heads from SD can you post the flow sheets?
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#60
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Here is the flow numbers for my SD CNC RP Eddy heads with the heart shaped chamber.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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