318/390 Build Progress

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Lookin good. I've got a 4 inch scat crank in my 318 with rhs heads. Has a lot of torque and lights the tires at will, your gonna have fun.
 
Looks really good! Bet you will be super happy with how it performs!
 
From Pan to carb here goes-
69' 318 Block .030 and decked 0.010
SCAT 9000 Crank 4.00 2.500 2.125
SCAT 4340 I-Beam Rods ARP 2000 bolts
ICON Forged -23cc dish 594grams
Clevite MS540HX +.001
Clevite H series Rod STD
ARP main studs 12pt (Had to order the low clearance bolts for #5 main to clear oil pump)
Meiling HV oil pump
Felpro 1008's
Total Seal File fit rings 1/16Moly 1/16 3/16
Comp 282S Magnum cam 282/282 adv 236/236 @ .050 .495lift w/ 1.5
Comp 995 Springs installed at 123lb seat 321lb open
Comp retainers and locks
69' 340 X Heads Ported, 3 angle, 2.02 1.60 Manley, cut .035" to 60cc chambers (Rough flow as I did not have them checked but 270cfm)
Proform Roller Rockers 1.5 (These have been good to me but I will go to either PRW steel or Comp Magnums in the future)
Summit Air-gap matched to heads
AED 750CFM No Choke Mech Secondaries
Shorty 1 1/2 Headers to 2.5 Full dual exhaust

Specs-
9.75:1 Compression

Goal-
To get my 3000lb Dakota into the 12's
 
I've always wanted to do a 390 build but I still don't have a good enough reason lol. I bet this is going to be a blast
 
mini said:
To get my 3000lb Dakota into the 12's
Click to expand...

My 3800lb 87 Dakota is close to the 12's with just a 5.2. And it's a mild build. Cam is 210/220 @ .050. I don't think that should be a problem with that combo! The headers will be holding it back some though.
 
Yeah 1 1/2 are the only headers avail for my 1st gen. I will have to get or make some custom jobbies 1 5/8 or 1 3/4
 
Looking good! Who makes those valve covers?
 
Pro-comp and they don't fit worth a sh@#. Sending them back and getting Mopar 5155525
 


Also switching to the Comp 294S - 248/248 @.050 .525 .525 Lift
API 9.5" Converter 3500Stall tight

Currently getting the Air-Gap cut down. Put the scope in the port to check how far out it was


I cut the heads .035.
 
This is a very interesting build as I am considering a similar one.
I didn't think you would need quite that deep a dish in those pistons. But with a 60 cc chamber I suppose it could give you a 9 .75 comp. ratio. Also, were you able to fit hardened valve seats since the valves are so close together??? The guy who did my heads said that it would be a problem when using 2.02 intake valves. My J heads only flowed 246 cfm on the intake and 161 on the exhaust after porting. That is about a 15 percent improvement over stock. Maybe he was being conservative with his port work. I think the rods should be 6.123 long. But anyway your heads should be able to support the added stroke with room to spare. I think you 2nd cam choice will give you a pretty radical idle but probably barley run on pump gas. I was going to go a little less on duration. But since my heads flow best at 550 valve lift I wanted to keep the lift pretty close to 550.
Good luck with this build. It should be a real terror on the street.
I really want to know about the hardened valve seats.
How do you guys think this engine will perform compared to a 340 block instead?
 
Hope you don't mind my pickling your brain but a 390 build with factory head castings rather excites me. (Not like a hot babe would) but still.
Did you have to cut a little valve relief in the heads due to valve shrouding? Since the bore is smaller than 340 bore size (3.910)? On a .030 over 318.
Anyway, it should be real responsive with a lighter rotating assembly.
I don't think that there are that many 390 small blocks out there so it will be unique and keep up with some of the 408's. Most of the 408's.With that cam and compression ratio it will sound bad ***. Your 3500 converter I would expect it to outrun many bigblocks, too.
I used Direct connection valve covers on my small block and they fit fine. (For that old time look).
 
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