Yunick13
2 Time FABO NASCAR champ 2023 FABO NHRA champ
Destroked 318 sounds interesting. Would probably have to use the Viper engine rods though.
A 4.342 bore with a 2.56 stroke would yield 303 inches. That would be interesting.Well if we want BORE size, go BIG or go home. Destroke a 400.
A 4.342 bore with a 2.56 stroke would yield 303 inches. That would be interesting.
A 4.342 bore with a 2.56 stroke would yield 303 inches. That would be interesting.
From what I understand, the gentleman with his back to the camera is David Pearson.
.120 overbore means paper thin cylinder walls, thick bores make more power, every time.+.120 291.7 cube 12.5/1 with a solid 300°/.500 lift 1.90/1.60 valves Single plane/750 carb.
514 hp. @7500 and 412 lb/ft @ 5000
Finding a block that could handle +.120 would be the key. Lots of core shift.
true that just throwing it out there..120 overbore means paper thin cylinder walls, thick bores make more power, every time.
You’d be back at a really high R/S ratio or a very tall compression distance or a compromise of both.
I forget the deck height of the B engines but it has to close to 10 inches. Maybe more. I forget.
Will the block take a .040 cut? I thought the max was .030.Neato idea. If you go .040" over, you'll be even closer.
Wow! I would like a dyno sheet on that motor. W-8 heads could not stay on motor if they are aluminum (rules).This is for sale on Racing Junk
SS/COMP 300 cu in 340 R-3 block 8.900 deck,4.080 bore, roller bearings,exterior oil pump,vacuum pump,belt drive and front mounted distributor, meziere water pump,crank trigger,MSD 3,Winberg crank 2.90,W-8 heads,T&D rockers 1.65-1.70,Titanium valves,GRP Aluminum rods, 5.84 Gas ported pistons, stainless headers.One run since fresh.Photos on request.
Anyone out there making a 2.56 stroke crank for the B motor? The con rods would need to be about 10 inches long.A 4.342 bore with a 2.56 stroke would yield 303 inches. That would be interesting.
Rules say either run a 273 block with no weight penalty or a 318 with weight penalty or go home. I spoke to a tech inspector at SVRA who said be able to certify the crank and try using a 340 block. He would not guarantee approval.Well if we want BORE size, go BIG or go home. Destroke a 400.
Bruce Toth builds Poly engines.So sometime in the late 50s, early 60s Chrysler wanted a car that could be run in a 5 liter class, so they built a 301 poly engine and offered it to the general public in the body they wanted to use. This was a short stroke 318 poly. The only change that you have to make to use it in an LA motor was it had an 8 bolt crank like a hemi, so you needed a hemi flex plate or what ever the conversion is for a 4 speed. In the 1980s a machine shop that I used made dirt track stock car motors out of LA motors with these cranks. Since no one builds polys to speak of these days you might find one cheap. I believe they were forged cranks.
Any and every block needs to be sonic checked for not only how much is there to start with but also how far it can be over bored. Some 318’s have been known to go to a 4.00 and live long happy lives.Will the block take a .040 cut? I thought the max was .030.
Will the block take a .040 cut? I thought the max was .030.
Rules say either run a 273 block with no weight penalty or a 318 with weight penalty or go home. I spoke to a tech inspector at SVRA who said be able to certify the crank and try using a 340 block. He would not guarantee approval.
From .030 to .040 is a .010 difference. I know you knew that already but bear with me. Maybe you didn't think of it like this. Another .010 is "only" .005" from half bore. .005 difference in the radius. Got that part? Now, if a .005 difference in the radius of the bore on a block was "too much" and made the block "weak" as you're eluding to, then that block needs to go in the garbage if it ever needs a .030 over bore. Stop and think about what you're saying. You're saying that 5/1000 of ONE INCH is the breaking point.
There's just no way that's true.
I have repeatedly told guys thick bores make more power than thin max overbore ones, but not many ever listen or acknowledge..120 overbore means paper thin cylinder walls, thick bores make more power, every time.