Re: Low rpm 390 stroker advice
Just another well-done but common street 445 build, Barry is a friend and does great work. That combo would be superb for you and Brent does similar builds as well. Keep in mind though, the cam Barry used will have significantly more advertised duration and is installed later (retarded) as well as a wider LSA and more lift, so although, like I said earlier,yours should do about the same if you put some thought in it, just because the cam .050 numbers look familiar, doesn't mean its the same
FWIW, all your parts in a 445, with the cam at 108 ICL (6 degrees retarded from where it is ground), should be pretty similar, however, you will need to run a bit less compression. I would say ideal is 9.5-9.7:1 with a tight quench, you can't go with the common 10:1 kit package. Even if you go a thick head gasket, you'll lower compression but lose quench benefit. Seems like it wouldn't make much difference, but it can in a heavy car.
If I were you, I would have your block prepped, square deck the block to the crank, shoot for 10.160 but easily go as short as 10.155 deck height, then ask go for minimum overbore with a deck plate. 4.07 would be .020 over and give a good thick cylinder, but .030 is fine too. Then we can calculate quench, compression and order a set of Autotec pistons for your build (no more expensive than the "kits" and the exact compression you need and a good metric rings set (5-10 HP gain), also order an internally balanced crank, a set of SCAT I-beam rods. With tat info we will tell you where to put the cam you have, and go for it
I am doing the same thing with a 462 for a CJ car, and I think I am leaning toward a 472 FE for my F-100 and will do it again. If you have the budget and the car is nice enough, this is a no-brainer.
However, like I tell anyone that rolls in, if you don't have the budget, that's OK too, build a 390, they run great too
I wish I could build it for you, but Omaha is a long way away. My CJ guy is willing to eat up the budget to ship things both ways, and we'll likely dyno at Brent's just for fun, especially if I can get both (or three) done in time. Knowing Brent is within driving distance, he's the right guy if you decide to pay someone/
Last comment, I temporarily slipped a little zero deck 390 in my F100, nothing fancy,. 216/228 cam, low .500s in lift, unported but fresh heads, 9.25:1 compression, Streetmaster single plane and a 750. It runs real strong, strong enough that I keep telling myself I should just slip my ported heads and intake and put an EFI kit on it instead of building the stroker, and so nice with the 750 I even doubt the EFI
Only pointing this out because in the end, going back to the original plan, a good cam in a fresh 390 with good heads, intake and the big carb will run great. Don't let us spend all your money if that's the way we are pushing you. Brent has a stout 390 going on the dyno on Friday and a wild one in the works, all of us don't only build strokers
If you do that, block prep is the same, you save significantly on balancing, pistons are a wash, likely reuse your cranks and rods. Something to think about.
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.
Last edited by My427stang; 09-03-2018 at 08:01 AM.