Actually i have no doubts, i think i am good with 9.8 or 10 to 1, DCR is under 8 to 1 with both, even if i advance the cam 8 degrees. This is calculated using the duration at 0.006" lift. Using the 050" duration and adding 15dg to intake closing point gives 8.2 with 8dg cam advance.

Smitty,

There was one I found of a 9yo kid at the wheel, dad standing behind him with his hand on the throttle, and the camera glanced down at the GPS at ~85. The description mentioned a "Built" engine, but wither I don't remember what it was, or it didn't specify. I did see the one you refer to, though. I was confused by the announcer, but now I get it.

At the end of the day, we see that the hull is good for it, with sufficient power. 85 is my goal. It will have to wait for time to refresh the 496, and I'll replace the pistons and bump the boost from the ProCharger. I'll have to upgrade the outdrive, as well, to handle the additional power. This is probably all probably a pipe dream, as the budget office is.... "satisfied".... with 77 and is pretty well convinced her knuckles are already white enough. :rolleyes:

Thanks. Brad.

Looking for valve springs, Ron calls for 180-200lbs @ seat, and no more than 500lbs open. 2.3"/1.88", 11/32 stem valves. going set the rev limiter to 6000rpm. Would like to use my comp 741-16 steel retainers if possible? Those are heavy tough.

Got the cam today, seems to be billet Core with everyewear gear. According to comp, the duration @.200" is 155°/160°


https://cimg0.ibsrv.net/gimg/www.off...c44221ac5c.jpg

Starting to modify the intake. First we machine the holes for injector bungs, injector bungs are made from 40mm thick aluminum rod, and we try to fill the the intake port with the bungs, so we dont have to fill the port by welding that much. This intake is rec port, that will be modified to match flotek r-oval runner.
https://cimg6.ibsrv.net/gimg/www.off...c1820b1c72.jpg
https://cimg4.ibsrv.net/gimg/www.off...2b1d1949cb.jpg

That doesn't look like a billet core. Billet should be gold/copper color.
https://cimg0.ibsrv.net/gimg/www.off...185a970c4b.jpg

Pressure added intake and head ports don't need larger CCs.

The compressed air or F/A mixture will behave the same as NA for the most part.

Not my words...from Darrin Morgan.
​​​​​
290 Floteks have a smaller chamber, and roval intake ports. They flow very similar to the 315/317cc heads. Likely only notice a diff at WOT, where the engine may spend 5% of total run time.

Awesome quote..."Ego Breaking Dyno"...

Depends on the type of steel core.

My billet Comp cams were also black.
https://cimg3.ibsrv.net/gimg/www.off...317a6b8d17.jpg

Double

Filing the ring end gaps, there is no instructions for marine closed cooling aplication. Should i follow the street moderate turbo/nitrous clearance? 10 to 1 compression.

https://cimg1.ibsrv.net/gimg/www.off...f9b9379d4b.jpg

call total seal tech they are extremely helpful..... to loose is better that too tight!

My rings are speed pro.

https://cimg5.ibsrv.net/gimg/www.off...82f9279239.jpg
https://cimg1.ibsrv.net/gimg/www.off...ad8e10e5a.jpeg

That's a lot of work. You can buy universal fuel injector bungs for $40.
Any reason you didn't go with a single monoblade LS style tunnel "ramish" intake?
Don't get me wrong, I am a fan of the twin throttle body tunnel ram. but...
This was on a 780HP 565.

https://cimg4.ibsrv.net/gimg/www.off...2b078a5f79.jpg

At first i was going to use carbs, thats why. Is that intake made by jimv? If so that is where i got my inspiration to efi. Nice looking intake btw 👍. The reason for thick injector bungs is that i can fill the runner with the bungs, less welding to get it match to oval port head.

On a low hp 502 (500/550) with thermostat and typical 4032 pistons and plasma moly 1/8 1/8/ 3/16 ill go 24 top, 26 second with a , if customers a hot dog or abuses it, light boost etc, Ill go 26 top and 28 second, until you go well past 40, its been proven has negligible effect on leakdown/power fwiw.

THANKS, 0.026"/0.028" it is then. Rings are 1/16".

Yes, that is JimV's old intake. It was on his old 27' Fountain. He now runs Single plane throttle body injection on his 38' Fountain.

Did you use IAC for idle correction?

Yes, I use IAC in conjunction with timing. I found that timing is faster than what the IAC can react. In gear I would stall often until I redid my idle timing tables.

Would be awsome to get base tables for ignition and fuel, but at this point i have a long way to tuning 🙂. My ecu does not have the driver for gm style 4pin stepper motor, so i am going to use the bosch 2pin fir 19mm hose.

36-1 Trigger wheel is ready for some paint.
Trying to find cost effective Bbc bracket for crank sensor, cherry Hall sensor.

https://cimg8.ibsrv.net/gimg/www.off...522b7485cf.jpg
https://cimg9.ibsrv.net/gimg/www.off...1f87a06803.jpg

I Didn't do much with my fuel at idle. I believe I'm around 13.5 AFR target. When warm my IAC runs at about 0-2%. The key is adjust the throttle blades so it does not need to use IAC at idle. (calibrate TPS after adjusting blades) I have my timing at 36° from 0-1000 RPM (target idle 800 RPM) and I allow idle stabilization timing to throw +/-8° timing to catch the engine at in gear transition with the help of the IAC to open +98% if need to stabilize the idle. I also have the IAC set to fast react.

What you think about the valve stem clearances for N/A, closed cooling, is 0.0017" int, 0.002" exh ok?

Look what just appeared in my Youtube suggestions...

Interesting, i quess the results would be different with marine exhaust manifolds vs those good flowing headers. I would never add 16 degrees duratiton to gain 10hp, when reversion and valvetrain stability is a concern. I think that the marine manifolds benefits more from the larger duration split.

thats fine,good valve seals will control the oil

I would bet different engine combinations would react differently, but it was a good video.

Should i use this type of seals on exhaust and intake?
https://www.summitracing.com/parts/cca-517-16

does flotech give you the guides top cut dia. for the valve seals.viton is what you want.

According flotek site, the valve guide OD is 0.500".

Found these runner extensions for weiand tunnel ram. 2" and 4" available.
https://www.ebay.com/itm/23550828552...4AAOSw2GlXKNCR

Back in the early 80's I had a pair of engines built by a big name guy near Detroit. Had those same intakes. Made good power but in order to lower the RPM band and increase torque he made some spacers like that. Worked great on the dyno. However first run out on the lake it broke one balancer clean off. On disassembly found the other one seconds away from the same fate.

Only thing we could figure was that the spacer really screwed up the air/fuel distribution.

would be interesting to see on a dyno with 10 o2 sensors like mine has, I see some stuff thats almost unusable as far as afr delta!

My plan is to make the first dyno pulls with headers and 8x02 sensors, and see what cylinders needs more fuel, and then change to my stainless marine manifolds and do the final tuning. My last engine Lost 19hp and over 40tq, with Sm (dry to transom risers) vs long tube headers.
https://cimg6.ibsrv.net/gimg/www.off...9878950615.jpg
https://cimg2.ibsrv.net/gimg/www.off...f8345f7cad.jpg

https://cimg3.ibsrv.net/gimg/www.off...b64f311792.jpg

Some progres today, i set/cut angles for the injector bungs, still needs quite a bit welding but not bad.
https://cimg8.ibsrv.net/gimg/www.off...bee4b85016.jpg
https://cimg0.ibsrv.net/gimg/www.off...506bf23a22.jpg
https://cimg1.ibsrv.net/gimg/www.off...3b7b49390f.jpg

Made a good deal of 8qt milodon full kick out pan. Dont know if it is any improvement over the merc original 8qt with scraper, but it looks cool.

https://cimg3.ibsrv.net/gimg/www.off...22fbe0a76d.jpg
https://cimg5.ibsrv.net/gimg/www.off...3014d761fd.jpg

Heads are ready. ferrea 6000, int 30dg backcuts, new seats, bowl/short turn blend, good port had too high air speed @.600 and up, trimming the head bolt pump fixed the problem. 1=good port, 2=bad port, 3=exhaust no pipe, 4.5" bore adapter.


https://cimg2.ibsrv.net/gimg/www.off...85a78e85e8.png