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Search found 2752 matches

by mag2555
Fri Sep 20, 2019 12:08 pm
Forum: Engine Tech
Topic: 270 magnum flat tappet idle speed and vacuum thoughts?
Replies: 19
Views: 737

Re: 270 magnum flat tappet idle speed and vacuum thoughts?

If your taking about a duel plane such as the Edelbrock performer 5500 rpm is at the top of its range and the HP being made will be nosed over very hard by 6000 rpm!
by mag2555
Tue Sep 17, 2019 12:08 pm
Forum: Engine Tech
Topic: SBC vortec distributor cap issues
Replies: 10
Views: 392

Re: SBC vortec distributor cap issues

I would look into how much play you have in the timing chain and or what the Distributor gear looks like.
by mag2555
Tue Sep 17, 2019 6:37 am
Forum: Engine Tech
Topic: Strange findings in 305 sbc heads
Replies: 4
Views: 464

Re: Strange findings in 305 sbc heads

Yup, 100% normal stuff, in fact Pontiac valves have the added lower grooove for the oil control O ring also. You had better not look at Mopar big block 3/8" stem valves as there 3 groove keepers as that will really make your head spin, lol! Just joking with that comment , as you say sometimes we foc...
by mag2555
Mon Sep 16, 2019 12:10 pm
Forum: Engine Tech
Topic: Nickel Fix
Replies: 7
Views: 678

Re: Nickel Fix

Was the broken rocker just a fluke,or are they on the edge?
by mag2555
Fri Sep 13, 2019 12:21 pm
Forum: Engine Tech
Topic: Chamber mod intended to improve combustion
Replies: 6
Views: 700

Re: Chamber mod intended to improve combustion

You could have not made the rework width the same all the way around to the chamber side of the valve because no matter what you do in a wedge type chamber head the side of the Exh valve that the side of the chamber raps around only flows may be 35% of what the rest of the circumference of the valve...
by mag2555
Fri Sep 13, 2019 7:18 am
Forum: Engine Tech
Topic: 14044862 aluminum heads?!? Are they to much for street application?!?
Replies: 4
Views: 524

Re: 14044862 aluminum heads?!? Are they to much for street application?!?

So it seems the 861 and 862 casting are large port Bow tie heads and can only be used on the mark 4 and 5 blocks. Aside from that there 380 cc runner volume would call for having atleast 556 cid under them for a street usage and in a light car and with 3.90 gears out in back to make good use of that...
by mag2555
Wed Sep 11, 2019 11:57 am
Forum: Engine Tech
Topic: Engine pro
Replies: 4
Views: 441

Re: Engine pro

As long as the hard drive in your current lap top is alive then yes, you can export it to another lap top.

If your current lap to hard drive ever dies on you then you will loose everything on it that is not backed up by a cloud service or on a CD of yours.
by mag2555
Wed Sep 11, 2019 6:12 am
Forum: Engine Tech
Topic: another blown up jetboat motor sbc
Replies: 16
Views: 1039

Re: another blown up jetboat motor sbc

Looks like you found the rpm where steady state Mid rpm loss of valve train control takes place!

I would change the heads right over to Beehive type springs
by mag2555
Tue Sep 10, 2019 12:48 pm
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2673

Re: Low speed (1500-1800 RPM) driveability issue

If your only making 500 hp at the flywheel then you have way too much port volume with thosevheads and inturn low port velocity and poor low speed throttle responce.
by mag2555
Tue Sep 10, 2019 12:05 pm
Forum: Engine Tech
Topic: Any Horse Power to be Gained?
Replies: 19
Views: 1034

Re: Any Horse Power to be Gained?

A performance gain would come from a pin being lighter for sure , but as I don't think any friction reduction between a pressed pin or floater could be measured on a dyno.
by mag2555
Tue Sep 10, 2019 9:34 am
Forum: Engine Tech
Topic: Low speed (1500-1800 RPM) driveability issue
Replies: 115
Views: 2673

Re: Low speed (1500-1800 RPM) driveability issue

How much HP would you say the motor is making?
by mag2555
Tue Sep 10, 2019 7:31 am
Forum: Engine Tech
Topic: Need help finding valves
Replies: 1
Views: 149

Re: Need help finding valves

A modern Stainless single groove valve with valve seats installed in the heads along with the needed new locks would be the way I would want to go for a marine motor usage with today's fuel!

Yes it will in the end cost the customer 200 bucks more, but it will be done right!
by mag2555
Tue Sep 10, 2019 6:46 am
Forum: Engine Tech
Topic: Undercut vs straight stem valves
Replies: 5
Views: 541

Re: Undercut vs straight stem valves

Under cut stems on the Intake side will always show a flow gain at certain valve lifts once the valve is beyond the .18D lift point. If the port then does run into turbulence issues that means the port shape was right , and on the edge of having issues anyway ( and needed to be corrected ) and the a...
by mag2555
Tue Sep 10, 2019 6:30 am
Forum: Engine Tech
Topic: Need opinions
Replies: 13
Views: 459

Re: Need opinions

The Cam needs for a pickup truck especially a 4 wheel drive one with all its added power losses is a much different thing then one for a 3800 lb car,and changing out the Cam in a truck leaning over tall fenders is not much fun so I would try my damedest to find out the spec's on that Cam and change ...