Performance Boats Forum banner

1 - 13 of 13 Posts

·
Banned
Joined
·
3,605 Posts
Discussion Starter #1
I'm ditching the 30+ year old dual plane intake and single 850 in favor of a tunnel ram and dual 850's, even though I've never even started the f***ing thing yet. I need some sort of starting point for the jetting, power valves, and anything else I might need to know to set the carbs up. Both carbs are mech. sec. Holley 850 List #4781.

13.25:1 BBC, .714/.714 lift, .274/.278 @ .050, I'm not sure what else is needed as far as info. Thanks!
 

·
mo balls than $cents$
Joined
·
11,734 Posts
mortec.com

jet them stock, then work from there;)

dude, hope you're making some o.t. at work, cause your fuel bill just doubled:D
 

·
Registered
Joined
·
3,879 Posts
I'm ditching the 30+ year old dual plane intake and single 850 in favor of a tunnel ram and dual 850's, even though I've never even started the f***ing thing yet. I need some sort of starting point for the jetting, power valves, and anything else I might need to know to set the carbs up. Both carbs are mech. sec. Holley 850 List #4781.

13.25:1 BBC, .714/.714 lift, .274/.278 @ .050, I'm not sure what else is needed as far as info. Thanks!
List 4781 holley factory is 82 jets squared. M
 

·
Resident Ford Nut
Joined
·
10,079 Posts
Well that's a hell of a turn around. Wow.

Dyno, yes/no ?

Sleeper CP :D
 

·
steelcomp was here
Joined
·
26,527 Posts
Thanks!

No O.T., but the side work is kicking some serious butt right now! :)devil
You oughta step up for that cam. Cheapest 75hp you'll ever get, and the one you have is going to be a tuning "challange", to say the least.
 

·
northern member
Joined
·
602 Posts
dude here we go with more of your replies to your own post. if you got steel pming you with info and you want to nail kill off the get go wtf don't you just listen to him and do it . etherwise you have put up with me given you my late night fri. bs . so here it is , good score if you got a tr with the dual 850's i'd square jet @ 90 no power valves 36* total , some good fuel with octane like vp110 or c12 and after your sure everythings happy you can lean it out and or advance the timing from there . better yet hook- up somebody that will tune it for you . and my 02 on a base cam for you would be something like 260*-265* single pattern with 108 lc with in./cl @ 106 . good luck and give er sheittt:)sphss
 

·
northern member
Joined
·
602 Posts
fix for head

ya mine after to many beers and tekiller shots lol, sorry for the misdirected frustration at the start of that last reply.... i do think a smaller cam peaking around 6500 would be easier for you to get the rest of your set-up sorted out on a new deal and then step it up when your ready for more :)grn
 

·
Banned
Joined
·
3,605 Posts
Discussion Starter #11
No worries, it made me LMFAO. :D

It's strange how my mis-guided brain works, I don't have the $450 for a dyno, don't have the $450 for a cam, but I did (apparently) have the $600 for a TR and a couple of Hollie's. LOL :)st
 

·
Banned
Joined
·
3,605 Posts
Discussion Starter #13
What heads did you wind up with (990's) and that cam lilrick is selling is pretty close to what you were looking at right? Do you really have 15.1 comp?
ProComp, 320 cc runner heads, I have a C impellor for it but it's not in the pump yet, I already have a cam, and the compression is 13.25:1. I'm going to run 110 race gas while I use the 2 850's. It's getting close to getting wet. :)devil
 
1 - 13 of 13 Posts
Top