what would you recomend for a 383,(I know you have made some 383 recomadations and have been reading all of them,but hav`ent seen rec for efi engines) build up so far.
3.80 stroke
6" rods
srp 4.020 16cc d dish
200 cc dart pro 1 heads ported by Mike Stark
flow data in ex
.100 88 69
.200 142 120
.300 210 161
.400 259 199
.500 286 205
.600 299 211
.700 302 215
heads now measure 210 cc.
heads have been angle milled to 54cc
my calulations come to approx 11.37 compression.
want to use solid roller.
have a set of jesel .875 roller lifters, block
has been preped for lifters w/ bronze sleves.
heads are currently set up for .620 lift,this can
be changed if necc,also 160# seat & 420# @ .600 .
planing on using Holley 950 multiport EFI
going in my 67 sbc pickup, 3700# W/auto,200r4 ;)
od,trans
3000 stall,411 gears
this will be pro street ride (real street)I may
go to track just to get a time slip,
I want to use all DCR possible w/ 93 octane pump
gas, will be useing thermal bearier coating on
pistons,chambers,valves.
useing 4340 crank and rods,will limit revs to
7500 rpms.
Thanks a lot Harold,its info from the pros like
yourself that make this board the success that
it is.
ps.(if you tell me to use 1/2" fuel line thats
what I will use).
If you need more info please let me know.

This one is the easiest, because I have thought of the same combo for myself, only with the 195 or 210 AFRs. As far as the Holley EFI, you need to ask them how high it can handle in HP. With your CR, CID, and heads, your engine can easily make between 560 and 590 BHP(on very conservative dynos).
My cam of choice is the Lunati 501C2LUN, 288/296 at .020, 255/263 at .050, 176/183 at .200, .626/.626 gross lift, .610/.610 net lift, and 109 LSA, 102 ICL. At .020 the timing is IVO 39° BTDC IVC 69° ABDC EVO 81° BBDC EVC 35° ATDC; this should be the info on the card.
Using .016 valve lash HOT, at .015" cam lift the timing is about IVO 41° BTDC IVC 73° ABDC EVO 83° BBDC EVC 39° ATDC. When you run the DCR program, use the 73° IVC number.....
This was the exact last cam ground at UltraDyne, and it is for my own personal engine......
You will need to upgrade your valve springs, as the cam is capable of 7500, although peak power will be about 6400. I like a 1.550" dia valve spring, about 210 lbs on the seat, 525 lbs open.
I used a valve spring identical to the Lunati 73367. Whenever the pressure went below 170 lbs or so, I'd throw the springs away unless you have some sort of good rev-limiter.
This cam will pull good from about 2500-2800, and is a good daily-driver, if you like over 500 BHP engines. I have a customer with a 3670-lb 64 Olds, 455 Olds engine at 9.8:1 CR, running 10.40s with a 3000 SS and 4.10s, and it is a daily driver.......
Do Holley's fuel system the way they say. Just check with them about the ability to handle about 600 BHP.....
You will need a small-base-circle cam to clear your rods, and check with Lunati on the availability of the EverWear gear to eliminate bronze gear usage....

UDHarold

Thanks Harold,
That sounds like what I`m looking for,(Power wise) was thinking I would need a bit more LSA (like around 112 for EFI) whats your thinking on this.
Thanks again,
Jginger

Jginger,

I'm waiting for Doug Flynn, Holley's EFI expert, to get back to me on the LSA question. As soon as I hear his thoughts on the requirements of LSA on the Commander 950, I'll let you know.
In testing in the 80s, with Bosch Speed-Density racing SEFIs, we used 106 and 108 LSAs.....

UDHarold

Harold I just saw your post on chevy efi board and want to thank you for your help in researching this matter.
The kit that Doug mentioned is the one I was looking at useing with a dart intake.
Also looks like everyone agrees with your 109 lsa, so that is what I will be ordering.
Thanks again I appreiate you taking time to research this for me. Jginger

Jginger,

No problem....
He didn't answer until WAY after I had gone to bed. I live about 45 miles away from Lunati, and I have to leave by 7:00 AM to be to work by 8:00, so I don't stay up as late as I used to.
Doug and I are co-workers, He's my contact at Holley for getting engines together for dynoing cams......
I have a neat idea for modifying a StealthRam, if I can only get them to do a SEFI. I want to try this on the engine I am VERRRRY slowly putting together, a 377(4.00X3.75), 6.00" rod, 10.3 CR, using the above mentioned SB288/296R9--Mine is an actual UltraDyne, the very last cam made there--, and I'm trying to promote some of those new 1.6/1.55 rockers out of Crane.... Heads will be 210 AFRs, and I will get them from YOU, Mike/WolfPlace.....
When I get it finsihed, it WILL go on Holley's dyno, hopefully for a magazine article....

UDHarold

Thanks Harold, whenever you need them just hollar, gotta keep you happy, we need to be able to pick your brain :D

Harold,
Have also been looking at Cranes new shaft rockers, have talked to tech about available ratios as I was looking for 1.6 intake 1.65 exaust. I was told more ratios will be available in next 2 to 3 weeks
My percentage of ex to in was 77% at .300 & .400 then dropped off to 71% at .500 to .600.
Do you think my ratio choice is ok or does your cam design compensate for my weak exaust. or am I over reacting to my percentages.
Your coment on modifying a stealthram caugth my eye as it was my 1st chioce for intake, but after researching (or hanging out at chevy talk efi board)was afraid it would`nt support 600hp.
But if looks can kill it will get the job done,so, if you care to elaborate I`m all ears. ;)

ttt

Jginger,

Your actual average flow rate is 74%, ((77%+71%)/2), about perfect for a 8°-split, int to exh. I plan on using the 1.60/1.55 rockers, giving .668"/.647" valve lash, .018"/.022" valve lash, and .650"/.625" net lift. This combo will work JUST FINE!

My 'idea' on the Stealth-Ram must remain a secret, because it predates by several years my employment at Holley, and may be patentable. I already have a patent in a non-automotive field, and I am sure that Holley will want to negotiate on whether or not they own the idea, since I work for them. But we'll see.....

UDHarold