How much HP/ Torque?
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Senior User
Joined: Jul 2009
Posts: 141
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From: Bangor, WA
How much HP/ Torque?
I did what is a Kind of stock rebuild of my 390 and I was wondering how much HP/ TQ i got out of it. Here is what i did;
Took the stock Heads (D2TE AA) and ported the Exhaust until the bump in the Runner was almost gone. Did some light port matching on the intake side and polished the runners as best I could. I lightly ground the chambers and also polished them to eliminate hot-spots as much as possible.
I have the "pop-up 10.5:1 pistons" according to my book.
I'm running longtube headers and a true dual 2 1/2" exhaust.
I "Port matched" my stock 'T' 4V intake as well as I could. Currently Running a Holley 500 CFM 2bbl on it with a 2V to 4V adapter plate.
Installed a new cam and lifters
Lift 484/510
Adv Duration 270/282
Duration @ .050" 204/216
Lobe Centerline 112 (107/117)
Any Ideas?
...I'm looking to upgrade to a Edelbrock streetmaster or old Holley single plane and a Holley or Demon 750 in the near future with a 1" carb spacer, how much HP will that bring me?
Took the stock Heads (D2TE AA) and ported the Exhaust until the bump in the Runner was almost gone. Did some light port matching on the intake side and polished the runners as best I could. I lightly ground the chambers and also polished them to eliminate hot-spots as much as possible.
I have the "pop-up 10.5:1 pistons" according to my book.
I'm running longtube headers and a true dual 2 1/2" exhaust.
I "Port matched" my stock 'T' 4V intake as well as I could. Currently Running a Holley 500 CFM 2bbl on it with a 2V to 4V adapter plate.
Installed a new cam and lifters
Lift 484/510
Adv Duration 270/282
Duration @ .050" 204/216
Lobe Centerline 112 (107/117)
Any Ideas?
...I'm looking to upgrade to a Edelbrock streetmaster or old Holley single plane and a Holley or Demon 750 in the near future with a 1" carb spacer, how much HP will that bring me?
Senior User
Joined: Apr 2006
Posts: 166
Likes: 0
From: Waco, Tx
cant get the desktop dyno working right now but, you need a 4b 650cfm carb for that build for sure. And i'd go with a dual plane just me. The edel rpm makes pretty good hp and tq without sacrificing either really. If you had these with a spacer (may need to rejet carb) something like 350hp/450tq give or take.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
You have pretty much copied the old Preimum Fuel (P.F.) 2 barrel 390 engines of 1967 thru 1970. They were rated at 280 horsepower @ 4400 and 403 ft/lbs @ 2600. You should find yourself a 600 CFM 4 barrel carb for this set up ( I would recommend a Holley List 1850). It will boost the hp to 315 @ 4600 and 427 ft/lbs @ 2800. The 4 barrel will improve the low end preformance and also boost the top end too.
More Turbo
Joined: Nov 2007
Posts: 703
Likes: 3
From: Western Washington
Would a carb spacer help improve torque? I've heard before the open spacers are better for low-end torque and the 4-hole spacers are better for top-end performance. Any truth to the matter?
OJ
OJ
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
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