Johnny Blaze

iTrader: (15)

Will someone run this combo trough for me?

350

10:1 compression

L98 heads, fully ported matched to 1205 intake gasket 3 anlge valve job

hyd roller cam 210 215 @.050" .490" .501" lift 110 lobe seperation

manifolds with 3" single exhaust bullet muffler

Performaer intake

750 cfm q jet carb.

Doom86

*edit: i redone it because i had hyd flat tappet the first time*

here's what i came up with for this setup.

It was much more "generous" when i had the cam as a hyd flat tappet, dont know why my self.

I used flow data i found here on TGO for basic ported iron l98's with 1.94 intakes and 1.5 exhaust. I didnt use the highly ported numbers to keep the hp/trq data as realistic as possible.

peak hp = 292 @ 4500rpm
peak trq = 422 @ 3000rpm

Johnny Blaze

iTrader: (15)

Thanks!

Sounds good. This is going in my DD truck so it should be fine.


Want to run another for me? If so, here it is,

427 BBC bored .060" over

14:1 compression

Heavily ported 063 oval port heads
2.19 1.88 undercut valves

solid roller cam

282 intake 290 duration @ 0.50" lift

.780" intake .712" exhaust lift

Crane 1.7 gold roller rockers

Team G intake
1050 dominator carb

1 7/8" headers, open exhaust

Johnny Blaze

iTrader: (15)

I wonder why the hp droped with the roller, but tq picked up?

Doom86

I was wondering why it changed like that too.

give me a minute and i'll run that bbc through too, im going to look for some flow data on those heads real quick for a more accurate figure.

Johnny Blaze

iTrader: (15)

Cool.

Doom86

Here we go;

i couldnt find any good data on the 063's so i used a generic "ported bbc head" i have. you may even see better numbers then this.

I also dont know how to calculate the added lift of the 1.7 rockers so again you'll probably see better numbers yet. If anyone knows of an online calculator or something like that, i'll re-run it with the 1.7 rockers lift added.

I used racing fuel too, i figured you'd be using it anyway with this setup.

peak hp = 712 @ 7500rpm
peak tq = 588 @ 5500rpm

Johnny Blaze

iTrader: (15)

Thanks.

The cam specs are for 1.7, that is standard for BBC.

izcain

Take the lift of the cam @ .050 and X's that by the rocker ratio which would be 1.7 and you will have the lift at the valve.

Doom86

Good to know. I'm not a "bbc guy" if you know what i mean

For some reason i always thought that they were 1.6 stock.

That original sbc we did showed some great improvement with long tube headers. When i used the "medium ported" 083 file for the heads with the long tubes it was a huge improvement, but still peaking early. It seems that cam is holding it back some-what for whatever reason (seems to be a decent cam on paper though). maybe it's just desktopdyno being screwy, its good for that sometimes.

Sonix

iTrader: (1)

how's your ride going doom? running?
Did you ever do a DD for your setup? I was wondering about mine, which is almost bang on the same IIRC. I think i've got a lot of tuning left to do though, it still feels lazy...

rhamm1320

Pretty close to what I got too. Not knowing the exact head gasket bore and thickness, I adjusted the chamber cc's to get the CR

Doom86

hey sonix, my rides running good now but its not the 350 i was building. I ended up getting a free 305 long block from a friend so i could get the car moving again. the good thing is that it's another '86 flattop 305, so it isnt a complete slug. life reached out and slapped me, taking away all of my money i was planning to use for finishing the 350. It kinda burns me up because i have EVERYTHING to put it together, except 1 -083 casting head (ruined the other porting it).

have you gotten a chance to take your car to the track yet? im seriously considering scapping the 083's and getting some 601's or 416's since they are so much easier to find.

I wish desktop dyno had an option for "highrise dual-plane intake" because the performer RPM manifold is not like "other" dual planes, it breathes great at higher rpm's. i've always considered it a hydrid of sorts so i'll list both types of intakes.

here's what i got for your setup sonix;

with dual-plane setting:
peak hp = 356 @ 5000rpm (still making 353 @ 5500 though)
peak tq = 399 @ 4000rpm (again, its 398 @ 3500)

with single-plane setting:
peak hp = 371 @ 5000rpm to 5500rpm
peak tq = 403 @ 4000rpm to 4500rpm

the image is w/ a single plane.

Sonix

iTrader: (1)

wow, that's generous results
Thanks for doing that.

I think I am maxing out at around 5000-5500 though, that sounds right. I've had it up to close to 6000RPM (on the stock gauge, should be pretty close), and it's not pulling all that hard up there.

My local tracks last weekend was...last weekend, so yea, won't be able to do that.

I'm seriously considering getting it dyno'd before the snow flies. I'm trying to fix my last few tuning hiccups though, with my q-jet. I think i'm close to a "perfect" tune.
750RPM solid idle, good cold starting (one touch of gas and it fires up flawlessly... Like it did on the showroom in 1982. Even though it's 32*F outside). <---- That's actually the part i'm most proud of.
Just a little weak on 1000-2000RPM range, and sometimes stumbles on higher RPM. I'm playing with plug's (fresh ones, heat range), and some secondary tuning finally.

Well, if anything fast355 says is true, i'd try the 601's next. Going full out on those and getting decent results would make me smile.