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#1
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What cfm head needed
Engine is a 462ci on alky, .630 solid roller. Shifting and trapping around 6500 rpm. An online calculator for figuring needed cfm gave me a # of 296cfm for 100% VE. , and 378cfm for 127.5 % VE. What other info could I use to point me in the right direction for getting the head I need?. Thanks
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1984 TA, 400 PONTIAC, th-400, 4.10 12 bolt 10.49@ 127mph 1.40 60' R/U Pontiacs in the Park 2006(SAT) R/U Pontiacs in the Park 2007(SUN) |
#2
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Where do you plan to purchase heads from?
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#3
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What are your goals/plans?
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#4
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Cubic inch and rpm will tell you the cross sectional area and valve size needed. Cfm is a result from those two
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The Following User Says Thank You to slowbird For This Useful Post: | ||
#5
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Bracket car, not looking for every last bit of HP, just as much as I can without sacrificing consistancy.
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1984 TA, 400 PONTIAC, th-400, 4.10 12 bolt 10.49@ 127mph 1.40 60' R/U Pontiacs in the Park 2006(SAT) R/U Pontiacs in the Park 2007(SUN) |
#6
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I would say that a good 330-340 cfm head on a 462 with that cam( depending on the rest of the cam spec ) would make plenty of power for bracket racing.
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#7
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Volumetric efficiency numbers above 100% come by way of both Intake and exh flow and wave tuning, ram tuning and Exh scavenging tuning , not just Intake flow amounts.
A typical off the shelf round port E head with bowl blend job flowing some 310 cfm@28" will with a race compression ratio of 12.5 to 1 or better should be able to make darn close to 700 hp if Camed right. If your TA weighs for example some 3400 lbs with you in it then by your current ET numbers your making 550 hp at the flywheel right now.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 01-31-2020 at 07:39 AM. |
#8
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Quote:
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#9
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He is way backed up, there was a thread on this in the street section. There are quite a few ports as good or better that will respond quicker.
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The Following User Says Thank You to slowbird For This Useful Post: | ||
#10
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Said he was 5 months out. That is not all so bad considering. One of his basic 340-350cfm E heads should more than get done what he is after. Not too expensive either.
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#11
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I have a set of E heads that were done by SD and I picked up 5 tenths with them, over my iron #62 heads, on a 463. That engine was around 600 HP, and I ran it for seven years, over a thousand passes, so I don’t have anything bad to say about Dave @ SD, however; when I wanted info on my heads, my phone calls & emails went unanswered....he must have been moving at the time, or maybe another reason??? I don’t know why, but I never did make contact when I tried. My next engine, the one in my signature was done by CVMS, and Dave Wilcox did the heads and crankshaft on my 468. If I recall correctly it was $800 for the head work Dave did. I asked for a couple tenths, and got that and a little more. My 468 makes about 675 HP. I had a set of HP’s done by Dave recently. When I was at his shop I saw some pretty impressive stuff. I don’t think Dave Wilcox will let you down when it comes to head porting. https://headsandmanifolds.wordpress....-to-look-like/
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1969 Firebird, Tx3-455/468 machined by CVMS E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid 850DP on E-85 by Eric Niefert/T2 1" plastic spacer T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400 1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine) https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be 1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine) |
#12
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