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Old 11-17-17, 01:06PM   #31
gtofreek
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IDK. We don't do fuel injection here. Jeff is a carb expert, and can make them run better than any fuel injection system.
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Old 11-17-17, 10:45PM   #32
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Stick to your choice. No one tells you what to do, so just do the voodoo you do so well
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Old 11-30-17, 08:36PM   #33
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I would like to see what it does with a Tomahwk. In my testing it beats the RPM hands down.
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Old 12-01-17, 03:25AM   #34
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With a Victor intake this engine made 505 HP, IIRC. Another 407 Pontiac that we tested years ago, made 506 HP with the Tomahawk, and with a Victor, it only made 6 more HP. So I think it would have been knocking on the 500 HP door with a Tomahawk.
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Old 12-08-17, 09:02PM   #35
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Are these the short travel hylift rollers or standard and is it looking like 6k is the limit no matter what?
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Old 12-09-17, 04:11AM   #36
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We did hit a little over 6200 with a 455 with these same lifters, but his heads did have a little more pressure. They had a little over 400 lbs. open, so they resisted pumping up a little longer. These have about .125" travel, IIRC.
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Old 12-09-17, 02:25PM   #37
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Are these the 2347S? 125 seems alittle long for short travel. Only ask because 6k is perfectly fine for what I'm doing but people keep saying to get the short travel. Significantly more money.

Excellent 400 motor btw. Think Daves heads are the secret sauce? Aside from your attention to detail of course
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Old 12-09-17, 03:11PM   #38
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Quote:
Originally Posted by 71 GrandPrix SJ View Post
Are these the 2347S? 125 seems alittle long for short travel. Only ask because 6k is perfectly fine for what I'm doing but people keep saying to get the short travel. Significantly more money.

Excellent 400 motor btw. Think Daves heads are the secret sauce? Aside from your attention to detail of course
I don't know about secret sauce. Dave does nice work. I've gotten pretty much the same numbers out of D-port heads before too, but it takes a lot of work. Dave has it dialed in with his port designs and equipment, so it sure makes things easier. Especially for someone like me who has my hands full as it is trying to keep up with everything else. The cams we use have a big part to play in it as well, along with the rest of the combination. We've gotten huge numbers with stuff we've done ourselves in house, so it's just the whole package that counts. The best heads in the world don't mean squat if the cam is totally wrong.

I should try to dig up a dyno sheet of a 439" SB Ford we built for a guys street strip car. The thing made like 610 Ft. Lbs., and over 600 Ft. lbs. for several hundred RPM. It made over 700 HP from 6500-7800 RPM, and peaked at 722. It had E-heads that I ported[without making them any larger except for what it took to do a nice shaped port the entire way.] They flow 292/200'ish. Car runs 9's at 3200 lbs. That had a Voodoo cam also.
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Old 12-09-17, 03:49PM   #39
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That's what I meant by your attention to detail. I apologize if I made it seem like it was just the heads. Ashamed your so far away otherwise you would have my short block.

About the original question, are you seeing .125 on the short travel hylift rollers or were they the regular 2347?
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Old 12-10-17, 02:05AM   #40
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All we have used is the 2347S. "S" does not stand for short travel, if that's what you're thinking. It stands for slow bleed. The "S" lifters take between 80 and 120 seconds to bleed down. The "R" lifters bleed down is 8-20 seconds, and the standard lifter has a bleed down rate from 20-80 seconds. So with the regular lifters, you won't have the consistency as with the "S" or "R" lifters. You may get some that bleed down quickly, and others that bleed slow, so your lift and duration can vary a little more than it would with the other two. I like the "S" lifter as it doesn't hardly bleed down at all. They act like a solid lifter without the noise. IIRC, they do not offer a 2347 in an "R" lifter. Only the "S", and standard's.

Not to worry, I'm not offended. Dave does good work so I don't mind at all using his stuff for some of this stuff.
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