750 dp jet question
#1
Junior Member
Thread Starter
Join Date: Mar 2004
Location: Gettysburg, PA
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
750 dp jet question
ok guys heres the deal. i've got a 350 with 9:1 compresson and a mild cam one step up over stock. i am running a aluminum holley contender dual plane intake. my heads are set of 305 smogger heads out of the 80's i think they have 1.94 intake and 1.54 exhaust and a small fuel runner. i also have a set of 4 to 1 headders. I was wondering what size jets should i use for this configureation? i am currently rebuilding this animal so any help would be great.
Thanks
Matt
Thanks
Matt
#2
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 36 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Start with what's in there.
After you get the engine running, rejet as required to tune it properly.
After you get the engine running, rejet as required to tune it properly.
#3
Junior Member
Thread Starter
Join Date: Mar 2004
Location: Gettysburg, PA
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
thanks but i got this carb used and it never was on the iroc. the guy i bought it off of said that it was on a 400hp drag car. i do not have this and i was wondering what a good base would be to start out.
Thanks for any help
Matt
Thanks for any help
Matt
#4
Supreme Member
iTrader: (1)
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 4,671
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
A "good" starting point would be clsoe to what Holley sends in box. 6.5" power valves and 76 squared jets.
#5
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 36 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It wouldn't have squared jets unless it had a secondary power valve or no power valve (primary or secondary).
The vast majority of 750 DP's, like your basic 4779-1 and up, would have something more like 71/80 jets ( http://www.holley.com/HiOctn/ProdLine/CarbList.pdf ).
The vast majority of 750 DP's, like your basic 4779-1 and up, would have something more like 71/80 jets ( http://www.holley.com/HiOctn/ProdLine/CarbList.pdf ).
#6
Supreme Member
iTrader: (1)
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 4,671
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
Good point, tunnel vision- go fast thinking got me again
#7
Supreme Member
Join Date: Apr 2003
Location: B'ville, WV
Posts: 1,781
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2002 Formula Firebird
Engine: LS1
Transmission: 4l60e
Axle/Gears: 3.23
I have a mild 350 with a 670cfm street avenger carb...and right now i have the 64/66 jets in mine.
Trending Topics
#8
.........
I have a 750 double pumper. Mine came w/ a 6.5 power valve in the front, and plugged in the rear. It came jetted with 71/80. I think this would be a bit rich for you though. I'd jet down a couple sizes and go from there, reading the plugs.
#10
Senior Member
Join Date: Nov 2004
Location: garland,tx
Posts: 541
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 gta
Engine: 5.7
Transmission: turbo 350
i would try to get another carb , possibly a 650 dp. i dont know if this is in your budget. a 750 dp i much too big for your motor.you can add more fuel but the cfm will not change and 750cfm i just too big.i hope it works out for you though.
#12
Supreme Member
iTrader: (1)
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 4,671
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
#14
Supreme Member
iTrader: (1)
Join Date: Apr 2002
Location: Waterloo, Iowa
Posts: 4,671
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 firebird with 98 firebird interi
Engine: pump gas 427sbc Dart Lil M 13.5:1
Transmission: Oldani TH400 w/ BTE 9" convertor
Axle/Gears: 31 spline Moser/full spool/4.11Rich
Re: 750 dp jet question
jet extensions, they make sure jets stayed submerged in fuel when leaving hard since the fuel in the bowl will naturally be pushed rearward and up the back of the bowl so jets can/could be sucking air instead of fuel...
Thread
Thread Starter
Forum
Replies
Last Post