318 power?

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A trick flow SB mopar head doesn't have the power potential of a factory OOTB LS3 head.
 
Mean416 said:
A trick flow SB mopar head doesn't have the power potential of a factory OOTB LS3 head.
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But I think a trick Flow head is capable of flowing enough to get a 318 close to 500 hp.
12:1 comp, 600 lift cam and a tunnel ram. spinner up!!
 
273 said:
I always found funny if someone came out with an aftermarket heavy duty 4.25" bore sbm people would trip over themselves to buy one but over look 383 which is basically one.
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IMO the B block line is a big block that thinks it’s a small block.
Personally live the short stroke big bore combo.
Although I think the factory could have use a tad more stroke myself.
 
rumblefish360 said:
IMO the B block line is a big block that thinks it’s a small block.
Personally live the short stroke big bore combo.
Although I think the factory could have use a tad more stroke myself.
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I feel the B should've came with 3.75" and RB 4" and the 273/318/340/360 all should came with the 4.04" bore :)
 
In a “what if” world, imagine if the factory used a low deck for the basis of the Hemi. But with a 4.4 inch bore Siamesed cylinder block, 3.5 inch crank, and long (6.76) rods to make 426 cubic inches.
 
Garrett Ellison said:
In a “what if” world, imagine if the factory used a low deck for the basis of the Hemi. But with a 4.4 inch bore Siamesed cylinder block, 3.5 inch crank, and long (6.76) rods to make 426 cubic inches.
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I was just thinking 3.5 or a 3.6 stroke for the B engine.
383 bore size…
3.50 X 4.25 = 397
3.60 X 4.25 = 408

The 400 bore is a 4.34? X 3.60 = 426.05

Works for me!
 
When you start looking at that in terms of reciprocating mass in the Hemi, along with a shorter runner intake, think of the RPM that sucker would have been able to live at on the super speedways, even with the technology of the day. That combination could have lived in the stratosphere with the “Mini Express” mushroom lifter cam if the factory would have kept the rod weight reasonable.
It may be worth mentioning for those that might not know that Just Mopar Joe on the YouTube is building a healthy stock stroke 400 with the intent of using spray that he’s going to be using a tunnel ram on for his ‘68 fastback barracuda. The B engine is my favorite “within reach” Mopar motivator.
 
rumblefish360 said:
I have everything except pistons for the 3.58 crank into a 340. I’d love to get started on mine now, but, there’s always something in the way. (LOL - groooooan)
I do like that combination of the increased stroke and big bore.


Darn tiny!
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Cledus said:
Just personal opinion if bigger displacement is better hard to beat a 400 stroked and built. Heck I have a 360 roller lifter engine out in the weather seasoning I say let it rot
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Are you going to build the 360 or just let it rust beyond use? I had a neighbor that left his 302 out in the weather to long and it took a 0.060 over bore instead of the 0.020 or 0.030 what a waste of a good 302.
 
Dan the man said:
Are you going to build the 360 or just let it rust beyond use? I had a neighbor that left his 302 out in the weather to long and it took a 0.060 over bore instead of the 0.020 or 0.030 what a waste of a good 302.
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I didn't know there was a "good 302"
 
I'd say 410HP and 7.50 in the 1/8th IF the suspension is properly set up. In 1969, I had a bone stock (except for headers) 69 340 Formula S Barracuda with a 4 speed and 3.23 gears. It ran 8.23 in the 1/8th, So I assume yours will do better.
 
Everyone took a HP beating in the mid 70’s until recent years.
 
Swinger 340 said:
Stock to stock,, a 5.0 never beat my 69' 340 Dart. Maybe the
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Get real. You want to compare, then compare apples with apples. The 302 Ford was their economy engine. So compare it with a Mopar 318 or GM 305. In emissions guise these all had crappy cams and lower compression.
You want to compare your 340, do so with the competition performance engines. The 340 was a performance oriented engine. Not all the 350 competitors were performance oriented either. Ford and the General built many 350 cube engines with 2V carburetors. Compare with 4V 350 GM or the Ford 351W and 351C engines. AMC 304 was an economy engine while the 360 had more performance potential.
 
Id say the 5.0 HO of the 80s would be a good side by side comparison of the early 70s 340 definitely the detuned smog 340. 5.0 HO was 225 horse the later 340 was 240 HP. early 340 has it beat though at 275 Horse. they both were "performance" engines.
 
Swinger 340 said:
Stock to stock,, a 5.0 never beat my 69' 340 Dart. Maybe the driver had the edge.
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my stock 1987 lx notch 5.0 5spd 2.73 ran 14.2 98.73 mph with a piss poor 2.15 60* avg 60* was 2.25 bad 60* 2.41 tires up in smoke
advanced timming 2 degrees and remove air box otherwise stock
silly 225 60 15 goodyear gatorbacks worse more useless then bfg t/a
shipping weight was 2750 add fluids lets call it 100 lbs as i ran it almost empty add me 250 lbs 3100 lbs
rated 225 hp using 3100 lbs and 98.73 mph says rwhp would be 232 give or take
for new cars only a prepared 87 buick gn could beat it 3 cars outta the hole everytime 13.8 13.9 then even thruout stock gn with a jamoke behind the wheel 14.2 14.3 or worse 87 vettes coudnt beat it but more traction limted then me
many mustangs 14.7 hatchback avg cant drive 15.5 5.0 auto slow as chit
i could not launch it above 1200 rpm
rolling start on the street i could take a gn pretty even 1/2 a fender until 127 mph the factory shutdown for the gn then it was history
i beat a jamoke in 1969 427 vette ragtop he told me no way my car was stock ( coudnt be that he coudnt drive or tune his car) lol
i had it going 5900 in 4th 2.73s 25.63 tall tires thats just about 160 mph quite a few times 5th gear was to deep it woudnt pull it up there
i use to go sit in the break down lane on rte 95 and wait for vettes and porsches to try and get them to top end race
hot rod tested a yellow 5.0 5spd 87 notch with 3.08 gears used vht and ran 13.9 @ 100 and stretched it out in 4th got 146 mph there abouts others tests had top end rated in 5th gear 142 mph they were faster in 4th
paid 10k brand new a bargin
the gt was 16 to 17k silly
they made 52 black 5.0 5 spd notches in 87 with no power options now theres only 51 left now :( prolly less

my stock 68 gts 340 auto 3.23s went 14.3ish@97 mph hate to say it gts would have beaten it out of the hole my notch would have ran it down
the gts was easy to run that et compared to 5.0 if you didnt slip the clutch just right instant tire smoke

the 5.0 notch was and easy 13.0 car with bolt ons drag radials gears and long tubes low 12s on spray
 
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