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Search found 628 matches

by dave brode
Fri Jul 31, 2020 10:21 pm
Forum: Engine Tech
Topic: SBC intakes Holley 300-25 vs 300-2
Replies: 10
Views: 793

Re: SBC intakes Holley 300-25 vs 300-2

thanks
by dave brode
Thu Jul 30, 2020 8:07 pm
Forum: Engine Tech
Topic: SBC intakes Holley 300-25 vs 300-2
Replies: 10
Views: 793

Re: SBC intakes Holley 300-25 vs 300-2

fwiw,

The 300-25 did really well on this hot street 406 test [19 intakes] Better than the Dorton 300-110.

https://www.hotrod.com/articles/19-sing ... akes-test/
by dave brode
Thu Jul 30, 2020 8:02 pm
Forum: Engine Tech
Topic: SBC intakes Holley 300-25 vs 300-2
Replies: 10
Views: 793

Re: SBC intakes Holley 300-25 vs 300-2

Both are full race very high rpm type. Not for a mild motor. If you did want to make both these more friendly to a "Mild motor" install a plenum divider. F-Bird, I would like to see a test of how a typical single plane with such a divider [fully divided] would effect the curve. I realize that a ful...
by dave brode
Thu Jul 30, 2020 8:00 pm
Forum: Engine Tech
Topic: SBC intakes Holley 300-25 vs 300-2
Replies: 10
Views: 793

Re: SBC intakes Holley 300-25 vs 300-2

Mr. Malik,

Do you know if this one is 1st or 2nd version of the -2? Did both have the boss for the oil fill tube? My 300-25 does not.
Dave
by dave brode
Wed Jul 29, 2020 4:43 pm
Forum: Engine Tech
Topic: SBC intakes Holley 300-25 vs 300-2
Replies: 10
Views: 793

Re: SBC intakes Holley 300-25 vs 300-2

thank you
by dave brode
Wed Jul 22, 2020 10:25 am
Forum: Engine Tech
Topic: Different spring needs for solid vs hyd lifters on a hyd roller cam. Also - a roller sold as solid AND hydraulic
Replies: 3
Views: 291

Different spring needs for solid vs hyd lifters on a hyd roller cam. Also - a roller sold as solid AND hydraulic

Sold as hyd:
285/240, .640"
spring called for: 140/350#

Sold as solid
280/240, 640" lash - .018"
spring called for: 210/500+

Is this odd? that aside, would the solid lifters on a wildish street hyd roller lobe require different spring [for the same max rpm]?

Thanks.
Dave
by dave brode
Mon Jul 20, 2020 4:05 pm
Forum: Engine Tech
Topic: How a solid roller with a lash spec over .020" would effect the advertised [.020" rise] duration number
Replies: 9
Views: 433

Re: How a solid roller with a lash spec over .020" would effect the advertised [.020" rise] duration number

CamKing wrote:
Mon Jul 20, 2020 3:27 pm

Lash is measured at the valve, and .020" duration is measured at the lifter, so .020"lash is different then the .020" duration.
.030" lash with 1.7 rockers would be .0176" at the lifter, and below the .020" duration checking point.
Boy, I feel dumb. Thanks for the jolt. I'm going to edit.
by dave brode
Mon Jul 20, 2020 3:16 pm
Forum: Engine Tech
Topic: How a solid roller with a lash spec over .020" would effect the advertised [.020" rise] duration number
Replies: 9
Views: 433

Re: How a solid roller with a lash spec over .020" would effect the advertised [.020" rise] duration number

Gents, Understood on advertised checking rise varying. Mr. Jones, thanks for the link. I remember that thread. I wish that I would have stumbled upon it in my searches of the last few days. , I'll re-study. Your method of deriving a published advertised number make one heck of a lot of sense. I boug...
by dave brode
Mon Jul 20, 2020 9:42 am
Forum: Engine Tech
Topic: How a solid roller with a lash spec over .020" would effect the advertised [.020" rise] duration number
Replies: 9
Views: 433

How a solid roller with a lash spec over .020" would effect the advertised [.020" rise] duration number

All, I was looking at some baby solid rollers for big block chev. One grind looked extremely slow, at 244"* at .050", and 304* advertised. Then I noticed that it was designed for a .030" lash. https://www.lunatipower.com/street-strip-solid-roller-cam-chevrolet-big-block-304-304.html Since the .020" ...
by dave brode
Fri Jul 03, 2020 7:51 am
Forum: Engine Tech
Topic: Straight through mufflers
Replies: 88
Views: 3187

Re: Straight through mufflers

Travis, I have a pu with a 10.3-1 CR 454. 3" duals, with X pipe above the driveshaft, exit at the roll pan. Fyi - there is no other good place for the X. The truck has the old coil spring control arms. I have the ability to swap from one pair of 12" body Dynomax bullet race mufflers under the cab [L...
by dave brode
Mon Jun 22, 2020 8:08 am
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 44
Views: 2618

Re: low buck junk SBC

More fwiw opinion, I know this isn't a L-31 head thread, but I can't see any logic in running the swirl heads on a racer. Best bang per buck 350 piston for a nice std bore block is a used Mahle flat top out of the late reverse cooling LT-1. F body and big car]. There are two styles of LT-1 pistons, ...
by dave brode
Mon Jun 22, 2020 7:53 am
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 44
Views: 2618

Re: low buck junk SBC

None of the L-31 truck "vortec" head s [906 or 062] that I've seen have had beehives. I've seen a few. Fyi - The step that locates the spring on some [most?] of the 906 and 062s is a little tight on the yellow and later blue Z-06 spring. Hack fix method: carefully run a well worn used 1" hole saw d...
by dave brode
Sun Jun 21, 2020 9:53 pm
Forum: Engine Tech
Topic: low buck junk SBC
Replies: 44
Views: 2618

Re: low buck junk SBC

dannobee wrote:
Sat Nov 23, 2019 11:57 pm
Vortec heads had beehive springs with smaller retainers. And didn't have valve rotators.
None of the L-31 truck "vortec" head s [906 or 062] that I've seen have had beehives. I've seen a few.