Need help with 390 stroker build
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 445
Likes: 0
From: Bismarck, ND
Need help with 390 stroker build
I realize this is a commonly discussed thing for ford FEs, but I need some input on what pistons and rods to purchase
Planning on a 4.125" scat crankshaft with the obvious carb, intake, and headers upgrade but I will be using stock heads. My whole goal is 400-450 hp with 9.5:1 approximate compression. I'm hoping to run 6.7" rods but what kind of pistons (I mean exactly, I know valve relief) and rods would work well with the crankshaft? I'm unsure on what kind of compression height pistons would work with .030 bored block, stock heads and the already given crankshaft and rod size specs.
any help appreciated
Planning on a 4.125" scat crankshaft with the obvious carb, intake, and headers upgrade but I will be using stock heads. My whole goal is 400-450 hp with 9.5:1 approximate compression. I'm hoping to run 6.7" rods but what kind of pistons (I mean exactly, I know valve relief) and rods would work well with the crankshaft? I'm unsure on what kind of compression height pistons would work with .030 bored block, stock heads and the already given crankshaft and rod size specs.
any help appreciated
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 445
Likes: 0
From: Bismarck, ND
Upon further inspection, 1.76" seems to be the compression height for most pistons which I believe is stock for a 390? My biggest issue is finding proper rods to go with pistons (pin size and making sure I don't get too close on deck height etc)
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
kit is the way to go , spend $49 on DD5 Desktop dyno 5 available on Amazon . it will help you pick the Cam,intake... it gives you a very good estimate on HP/TQ with graph.
like this
like this
Posting Guru
Joined: Jul 2003
Posts: 1,287
Likes: 3
The wisest choice is to purchase a complete rotating assembly from Keith Craft Racing, or Barry, or your choice of a competent source which will remove the guess work.
Ford FE Kits - Craft Performance Engines
FE Stroker Kit Tech
Survival Motorsports - Machine Shop
Ford FE Kits - Craft Performance Engines
FE Stroker Kit Tech
Survival Motorsports - Machine Shop
Cargo Master
Joined: Dec 2015
Posts: 2,539
Likes: 321
From: Harned, Ky
I would up grade the heads to CJ size valves, big cubic inches won't matter if the heads can't flow the air.
Trending Topics
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 445
Likes: 0
From: Bismarck, ND
Could you run one for me? Stock heads, 445 stroker kit (obviously) any run of the mill cam you'd like to enter (haven't planned out my cam yet) performer rpm intake, 750 cfm carb, headers.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 445
Likes: 0
From: Bismarck, ND
Originally planned to take considerations from Barry's kit but then decided I'd have to dig into things I'm not too educated on. Anyone want to be a pal and suggest a choppy idle cam? Comp cams specd me one but didn't seem to realize I had stock heads and gave me a cam with too much lift for them
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
sure but need more info ,
what are your plans for the truck ? toy /hauling/race truck ....
my 390 with mild cam and 10:1 came in at 402hp and 533 TQ on DD5
software is not 100% but + - 7% ish
what are your plans for the truck ? toy /hauling/race truck ....
my 390 with mild cam and 10:1 came in at 402hp and 533 TQ on DD5
software is not 100% but + - 7% ish
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 445
Likes: 0
From: Bismarck, ND
possible cam specs.
Could you highlight me on your build?
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
CAM FOR 1
what size carb are you planning CFM
Headers shortys long tube ? stock logs (hope not)
If stock heads 72cc (most common)
The more info you put into DD5 the better
my 390 details below in signature
what size carb are you planning CFM
Headers shortys long tube ? stock logs (hope not)
If stock heads 72cc (most common)
The more info you put into DD5 the better
my 390 details below in signature
Thread Starter
|
Senior User
Joined: Oct 2015
Posts: 445
Likes: 0
From: Bismarck, ND
750 cfm with the stroker kit, 600 if i stray away from the kit. long tube headers and stock heads (69cc or 72) as of now
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
ahh
390
stock bore 10:1 cr
Lunati 62001 cam kit
Home ported heads stock valves (72cc) c8ah
performer intake
Holley 3310 750 cfm carb tried 600 and 650 engine liked 750 the best
Flotech long tube headers
390
stock bore 10:1 cr
Lunati 62001 cam kit
Home ported heads stock valves (72cc) c8ah
performer intake
Holley 3310 750 cfm carb tried 600 and 650 engine liked 750 the best
Flotech long tube headers