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Search found 610 matches

by dave brode
Sun Dec 15, 2019 11:19 am
Forum: Engine Tech
Topic: vortec 062 drop-in hydraulic roller valve springs
Replies: 17
Views: 2144

Re: vortec 062 drop-in hydraulic roller valve springs

FWIW: I found that the LS-7 springs use a retainer that is different than the other LS retainers. They have a metric valve too, but they must use a fatter lock than the other LS engines use. The LS-7 retainer fits 11/32" valve with normal 11/32" locks. The lock angle look correct, etc. I know this s...
by dave brode
Sun Dec 15, 2019 11:10 am
Forum: Engine Tech
Topic: vortec 062 drop-in hydraulic roller valve springs
Replies: 17
Views: 2144

Re: vortec 062 drop-in hydraulic roller valve springs

I have used the blue GM springs with comp #787 retainers and +.050" locks with stock self aligning rockers on oem vortec heads. I have found the older yellow GM springs to fit too tightly on the stock spring boss register. Not had that issue with the blue. I have found no issues up to .525" with th...
by dave brode
Mon Dec 02, 2019 9:43 am
Forum: Engine Tech
Topic: ARE ALL sbc 010 BLOCKS HIGH NICKEL????
Replies: 99
Views: 24504

Re: ARE ALL sbc 010 BLOCKS HIGH NICKEL????

From Jenkin's book The Chevrolet Racing Engine: page 8, for racing use it is valuable to select a block that is "hard". There is some variation in the production casting material, and we often use a portable Brinell tester to find "hard" blocks. Page 6. The best factory block casting to obtain is p...
by dave brode
Tue Jun 12, 2018 10:33 pm
Forum: Race Cars & Parts - For Sale or Wanted
Topic: Wanted one nice std L2307 LS7 piston
Replies: 1
Views: 1880

Wanted one nice std L2307 LS7 piston

Need for a friend. Please message me if you can help. 2nd design, open chamber. 50cc dome, .580"
Thanks.
Dave
by dave brode
Sun Jun 10, 2018 1:20 am
Forum: Engine Tech
Topic: pressure inside a spur gear oil pump
Replies: 11
Views: 1081

Re: pressure inside a spur gear oil pump

Craig, I have the pump apart, but not with me. I will take a picture of the pump early next week. The hole with the pipe plug shown in the pump picture is where the return connects on engines equipped with a cooler. It is directly under the outlet, which leads to the mounting flange end, in the top ...
by dave brode
Sun Jun 10, 2018 12:47 am
Forum: Engine Tech
Topic: pressure inside a spur gear oil pump
Replies: 11
Views: 1081

Re: pressure inside a spur gear oil pump

pamotorman wrote:
Sat Jun 09, 2018 6:08 pm
sounds like it might be a by pass oil cooler like the old 6 cylinder chevy oil filters that only filter some of the oil.
Correct. I'm just having a hard time that the oil moves from the high pressure side back to the high pressure side [of the pump].
by dave brode
Sat Jun 09, 2018 5:50 pm
Forum: Engine Tech
Topic: pressure inside a spur gear oil pump
Replies: 11
Views: 1081

Re: pressure inside a spur gear oil pump

That valve is probably a check valve so it doesn't drain when it the engine is shut down, which would result in every time the engine is started the cooler would need to be filled before oil could go to the bearings I don't believe so, as the in/out passages are open at all times. The bypass is bet...
by dave brode
Sat Jun 09, 2018 5:21 pm
Forum: Engine Tech
Topic: pressure inside a spur gear oil pump
Replies: 11
Views: 1081

Re: pressure inside a spur gear oil pump

The bolt on the pump is to adjusting the pressure only. It dumps to the sump through a hole in the boss visible. There is no valving of any sort anywhere, except for a spring loaded bypass valve in the cooler body, similar to that in a chevy oil filter mount. I understand what you mean about cold oi...
by dave brode
Sat Jun 09, 2018 4:27 pm
Forum: Engine Tech
Topic: pressure inside a spur gear oil pump
Replies: 11
Views: 1081

Re: pressure inside a spur gear oil pump

Thank you, Tuner. If I were to have looked closer, I might have realized that when I saw the direction of rotation [feeling dumb]. Looking at the shortblock picture, the gear toward the top of the picture must turn CW, and the lower one CCW. ** Note that gear toward the top of the picture is larger ...
by dave brode
Sat Jun 09, 2018 1:24 pm
Forum: Engine Tech
Topic: pressure inside a spur gear oil pump
Replies: 11
Views: 1081

pressure inside a spur gear oil pump

All, I'm trying to understand how the oil cooler plumbing works on an old marine engine. Spur gear pump [like chevy] Picture shows the pickup line hanging on the pump. You can't see the cooler return in that picture. The other picture shows [a poor view] of a pump with a pipe plug below the pressure...
by dave brode
Sat Jun 09, 2018 12:04 pm
Forum: Engine Tech
Topic: hotrod Chris Craft Hercules flatty - need advice
Replies: 48
Views: 6863

Re: hotrod Chris Craft Hercules flatty - need advice

Gents, Thanks for the comments/advice. I had that Woodie site bookmarked. I remember seeing specs for a replacement spring that showed pressures that were very low. I also remember a thread somewhere in which one vendor saying that said spring was not correct, and that he had the correct "stock" spr...
by dave brode
Tue Jun 05, 2018 9:07 pm
Forum: Engine Tech
Topic: hotrod Chris Craft Hercules flatty - need advice
Replies: 48
Views: 6863

Re: hotrod Chris Craft Hercules flatty - need advice

grandsport51,

Nice looking KBL there. Whatfer valve spring pressure did you have? Where did the cam go it? Mine would be 4.75* behind, but if I jump the timing gear one, it'll be apx +3.
Dave
by dave brode
Fri Jun 01, 2018 3:54 pm
Forum: Engine Tech
Topic: hotrod Chris Craft Hercules flatty - need advice
Replies: 48
Views: 6863

Re: hotrod Chris Craft Hercules flatty - need advice

Thanks, Gents. I'm working with bad old times tooling, and i'm a bit less than .002". I'll open them some. Anyone care to comment on 70/140 valve spring pressure being ok? Dave Copied from earlier post: The stock springs, probably from 1957, have 21# seat, 41# open! I found springs from a 1.6 Honda ...