My next 454 build

[vortecpro]

snipped

Thanks, information I can use, the GM rockers are no longer available, might be worth a back to back dyno test between the two


!

If one has to buy rockers, the roller tipped #1411 comp are only $25 ish more than stock type.

On another note, I wish your plan was for this engine's CR to be on the edge of pump gas, rather than barrel gas.

I need the compression for where I race, I will run VP-C12. My other engine was a pump gas engine.

[Monza355]

I love these kind of builds that you we done in the past vortecpro. All of your engine work is fantastic and the finished product looks killer ! Especially the 468 peanut pump gas flat tappet engine !! It was great to follow the process of the build and drag strip testing and the final results of that engine Killer !!

[ClassicComp]

" GM LS 6 stamped steel rocker arms"

Are these still available from GM?

The ratio tests in D.Vizard's SA311 book [page 108] are interesting. Although all are sold as 1.7-1, the TDC, initial, and overall ratios on the Comp 1211 and Crane 13800 and 13801 stamped rockers are all much greater than with "GM" stamped.

Although a little more money, his findings on the comp roller tipped 1411 1.72-1 show that they are so much better yet. Could initial ratio and TDC lift effect the way the overlap flow makes good things happen?

Then there is the ball groove length issue, oil being trapped, or running away. There was a thread here....

Thanks, information I can use, the GM rockers are no longer available, might be worth a back to back dyno test between the two, the thing is I know the GM rockers live, but I would not like to give up power. A story: when I built my peanut port I tried to keep it as close to what I sell as possible. My goal was to run a 10 sec ET at a 2130 foot track. I've seen this situation a few times before.....I took my car to Bandimere/Denver 5800 feet elevation, to race it, I thrasher all day on the car and ended up with a 11.04 ET, all I could think about is if I just would have done a little more to the engine, 6 more HP would have gotten me that 10 sec pass @ Bandimere........well lets just say thats not ever going to happen again, the moral of the story-make dam sure you get everything!

. M77 or a short 396 325hp pump

[vortecpro]

Late 70s truck oil pump with modifications. Heres the flow numbers on my virgin 390 heads.


SF 600 @ 28 inches, 4.350 bore

Bad port

2. 133
3. 191
4. 224
5. 242
5.4 247

Good port

2. 122
3. 180
4. 230
5. 260
5.4 266

Exhaust port

2. 92
3. 120
4. 140
5. 157
5.4 161


Thanks for the nice comments Monza!

[Carnut1]

Late 70s truck oil pump with modifications. Heres the flow numbers on my virgin 390 heads.


SF 600 @ 28 inches, 4.350 bore

Bad port

2. 133
3. 191
4. 224
5. 242
5.4 247

Good port

2. 122
3. 180
4. 230
5. 260
5.4 266

Exhaust port

2. 92
3. 120
4. 140
5. 157
5.4 161


Thanks for the nice comments Monza!

Intake flows are a bit better than I expected but the exhaust is way worse. Interesting. Thanks, Charlie

[vortecpro]

Its very possible the exhaust valve was leaking.

[Carnut1]

Its very possible the exhaust valve was leaking.

That would add a bit no doubt.

[rfoll]

I think you have. the good and bad port #s reversed

[vortecpro]

Its very possible the exhaust valve was leaking.

That would add a bit no doubt.

These casting are real nice, no core shift, nice even height on the short turns, preliminary porting shows promise on the intake ports.

[Carnut1]

Its very possible the exhaust valve was leaking.

That would add a bit no doubt.

These casting are real nice, no core shift, nice even height on the short turns, preliminary porting shows promise on the intake ports.

I know these will do just what you want. Core shift makes a huge difference. Cc them, and grind until your hands are numb. That is what it will take. You already know that. Thanks, Charlie

[vortecpro]

Money spent as of now


75.00 Block
100.00 heads
250.00 pistons
60.00 rod bolts
100.00 crank work
400.00 cam and lifters
10.00 retainers
5.00 rear main seal
10.00 pan gasket
10.00 timing cover gasket
20.00 valve seals
60.00 rod and mains
20.00 oil pan parts
100.00 valves
50.00 valve guides
30.00 spring locators
5.00 valve keepers
60.00 exhaust valve work
240.00 piston work
124.00 rocker arms and studs



My old peanut port served me well, out with the old, in with the new. My bob weight on this closed chamber engine looks like its going to be just under 40 grams more than the peanut port, not good, hopefully I can get the bob weight down, I really don't want to go backwards on this build from my last.

[Bob Hollinshead]

Mark, what accumulator are you using? Do you use it for prelube too? Is it controlled with a switch?

[Old School]

60.00 exhaust valve work
240.00 piston work

Can you explain the exhaust valve and piston work? Thanks

[vortecpro]

Mark, what accumulator are you using? Do you use it for prelube too? Is it controlled with a switch?

Bob

Its a Moroso 3 quart. It is not electrically controlled. You can use it for prelube, but I use it for extra oil outside the pan.

[vortecpro]

[quote="Old School"]60.00 exhaust valve work
240.00 piston work

Can you explain the exhaust valve and piston work? Thanks[/quote

My exhaust valves were cut down from 1.880 to 1.800, closed chambered head. My pistons were sent direct to Rebco for lightening and fly cutting, not worth doing myself for what Eric charges and considering his EXCELLENT service. Meanwhile I need to retest the peanut port to see were its at.