377, 393, or 408 stroker?

02-19-2001, 10:22 PM

Im currently building the chassis for my 78 Fairmont Futura, plans call for 351w and 2 turbos. While Pricing out machine work, these stroker kits do not seem to be a bad deal. Does anybody have any experience with them? Which would provide good durability? Do any of them have the oil consumption problem some of the 347s have? I really am taking a liking to the 408, but I dont know.
THANKS

84_GT350 · 02-20-2001, 03:58 AM

I'd say the best compromise of durability and performance would be the 393. It should have a better rod angle than the 408 and a tad more power the 377. The oil control will depend on the piston design. As you'll see on some builder's website's, a lot of company's kits have pistons in which the oil control ring intersects the piston pin. This is fine for drag cars, but street cars need the oil control. Try to find one with a piston designed so this intersection isn't an issue (like DSS or Coast High Performance). Also, check out the specs like the rod/stroke ratio. It's too difficult to explain and I'm not even sure I understand it well enough to give a good explanation, but just remember that higher numbers are better.

------------------
1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

02-20-2001, 01:19 PM

i know the optimum rod stroke ratio is 2:1, and a 408 is like 1.5:1, however a 351w long rod kit is more like 1.88:1, which may be the way to go

drag79stang · 02-21-2001, 01:41 PM

Quote:

Originally posted by mikos chris:
Im currently building the chassis for my 78 Fairmont Futura, plans call for 351w and 2 turbos. While Pricing out machine work, these stroker kits do not seem to be a bad deal. Does anybody have any experience with them? Which would provide good durability? Do any of them have the oil consumption problem some of the 347s have? I really am taking a liking to the 408, but I dont know.
THANKS

Just finished purchasing/machining/building/dyno'ing my combination. It's an eagle kit, Part no. # 14127. 351w block. It's now 418 cubes. Excellent kit. Dyno'ed at 572.6 HP @ 6200 rpm, (with old victor jr. intake....now have Super victor, sposed to be good for another 20 or so HP). Torque was 517 @ 5400 rpm. As far as the oil control, the Eagle kit has plenty of meat under the piston pin, (rings don't go right where the pin boss is). I can hardly wait for spring!!!!!!

DirtKing · 02-21-2001, 10:57 PM

strokers won't last as long as a comparably prepped stock rod motor. If you're going stroker then don't worry too much about rod ratio. If you build it properly I don't see that much reliability difference between the 393 and the 408...biggers better. Long rod motors should benefit from reduced friction losses and longer time at tdc to make more power. I'm building a long rod 358 right now, I'll let ya know what she dynos at.

------------------
88LX notch, Speedpro EFI Procharged!

02-19-2001, 10:22 PM	#1
mikos chris Guest Posts: n/a	377, 393, or 408 stroker? Im currently building the chassis for my 78 Fairmont Futura, plans call for 351w and 2 turbos. While Pricing out machine work, these stroker kits do not seem to be a bad deal. Does anybody have any experience with them? Which would provide good durability? Do any of them have the oil consumption problem some of the 347s have? I really am taking a liking to the 408, but I dont know. THANKS

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02-20-2001, 03:58 AM	#2
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	I'd say the best compromise of durability and performance would be the 393. It should have a better rod angle than the 408 and a tad more power the 377. The oil control will depend on the piston design. As you'll see on some builder's website's, a lot of company's kits have pistons in which the oil control ring intersects the piston pin. This is fine for drag cars, but street cars need the oil control. Try to find one with a piston designed so this intersection isn't an issue (like DSS or Coast High Performance). Also, check out the specs like the rod/stroke ratio. It's too difficult to explain and I'm not even sure I understand it well enough to give a good explanation, but just remember that higher numbers are better. ------------------ 1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

02-20-2001, 01:19 PM	#3
mikos chris Guest Posts: n/a	i know the optimum rod stroke ratio is 2:1, and a 408 is like 1.5:1, however a 351w long rod kit is more like 1.88:1, which may be the way to go

02-21-2001, 10:57 PM	#5
DirtKing Registered Member Join Date: Feb 1999 Location: brooklyn center,mn,USA Posts: 169	strokers won't last as long as a comparably prepped stock rod motor. If you're going stroker then don't worry too much about rod ratio. If you build it properly I don't see that much reliability difference between the 393 and the 408...biggers better. Long rod motors should benefit from reduced friction losses and longer time at tdc to make more power. I'm building a long rod 358 right now, I'll let ya know what she dynos at. ------------------ 88LX notch, Speedpro EFI Procharged!