400 Block 350 Crank ???? - Team Camaro Tech
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post #1 of 12 (permalink) Old Sep 15th, 05, 04:03 AM Thread Starter
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400 Block 350 Crank ????

I have been reading in CHP mag. about a 30 overbore 400 with a 350 crank and you get a 377ci. engine that reves like crazy and has the tourqe of a big block.What I was wandering is ,I have a 509- 400 block that has the 010-020 under the timing cover and it is a standard bore and I would like to see what kind of combo that I would get by leaving the block a standard bore and using a 350 forged crank ,forged Pink rods,and forged pistons,and a good cam and a set of World Products Sportsman II heads with an Edelbrock Victor JR intake,Can you give me some idea as to what kind of combo this would create,how It would run ETC,,,,, oh yes add a 700 Holley double Pumper to that list Thanks for the input Camaro BOB
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post #2 of 12 (permalink) Old Sep 15th, 05, 06:03 AM
 
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Some guys like the high-winding shorter stroke motors that trade torque for hp and others just the opposite so take your pick b/c it is YOUR motor.

AND remember, there is "no replacement for displacement" and only "cubic money beats cubic inches"!

I like the high-winding little motors, but I also have a 496 BB in my car now and a little 283 on the shelf for later, (292/301 -- He, He!!). I'm gathering 8,000+ rpm parts for my 283 jobber now too...

And a 406 SB on my motor stand...

pdq67



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post #3 of 12 (permalink) Old Sep 15th, 05, 08:03 AM
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Re: 400 Block 350 Crank ????

What you ask is VERY do-able. Back in the day, you could buy extra thick "spacer" bearings and pistons with the correct deck ht for this combo, no doubt all this is still available.

Only thing I wonder about is why give up any cubic inches?

Still would be a good option, 'specially if you have a good 350 rotating assy and the 400 crank is shot.





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post #4 of 12 (permalink) Old Sep 15th, 05, 10:29 AM
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Re: 400 Block 350 Crank ????

If you have tall gears (+4.11) and like screamers... go for it.

If you want grunt and have smaller gears (-4.11) build a 406ci +.

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post #5 of 12 (permalink) Old Sep 15th, 05, 03:15 PM
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Re: 400 Block 350 Crank ????

Like Jim said, back in the day you bought the spacer bearings and I think if you used the 400 pistons with the 350 rods (5.7" vs. 5.565") the deck clearance was close to zero. I knew a few people running this setup and one of them still has one in a '69 Chevelle with an old 100 hp nitrous plate that turns on pretty well.

69 RS 355 Tremec 5-Speed 4.11's
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post #6 of 12 (permalink) Old Sep 15th, 05, 03:24 PM
 
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Re: 400 Block 350 Crank ????

I had a 377 in my 73 Vega drag car. 2850 lbs, glide w/brake, 5k converter, 5.13 gear 9", 13:1's, Brodix track 1 alum. heads, .625" solid, 750 vac, left at 5k on the brake, easily ran 9.90's-1/4, 6.50's-1/8, didn't have much of anything below 4k but pulled like a sonofagun over 6k.
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post #7 of 12 (permalink) Old Sep 16th, 05, 03:24 AM
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Re: 400 Block 350 Crank ????

377s rip. A good 350 with more cubes. If you have ever had a GOOD 350, then you know they run! I have a friend who mostly always builds 377s. And his stuff runs hard " 9s ".
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post #8 of 12 (permalink) Old Sep 16th, 05, 10:56 AM
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Talking Re: 400 Block 350 Crank ????

Many dirt track "roundy round" guy's, run 377's.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #9 of 12 (permalink) Old Sep 16th, 05, 12:15 PM
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Thumbs up Re: 400 Block 350 Crank ????

Quote:
Originally Posted by JimM
What you ask is VERY do-able. Back in the day, you could buy extra thick "spacer" bearings and pistons with the correct deck ht for this combo, no doubt all this is still available...
They still are - Clevite should still list them in their catalog.
Look in the 400CI section under 'Mains' . They would be for a 2.45" journal size v.s. the 2.65" 400 journal.
The part number I have in one build sheet is TM77-MS-1564-P.
I would double check that with your supplier.
Think they were available in limited sizes (std & 010?) so be sure to check your crank.

Hope this helps;
John

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post #10 of 12 (permalink) Old Sep 18th, 05, 02:45 PM
 
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Re: 400 Block 350 Crank ????

I think the Sortsmen II's would need a lot of work to support a good
running 377. This is a very good drag racing combo, just be aware that
you are likely to have a narrower power band that needs to wind up.
Good balance,good rods and bolts, studded mains, etc. would be a wise
investment when you could be seeing 7000 rpm.
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post #11 of 12 (permalink) Old Sep 18th, 05, 07:24 PM
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Re: 400 Block 350 Crank ????

Bob the 377 is a good drag racing and road race engine if you like small blocks. Eagle makes a 350 stroke crank 3.48, with 400 mains so you don't need special bearings on the mains. The price is very reasonable $325. It is forged steel for use with 6.0 rods on the 377, x-rayed, magnafluxed and sonic tested, nitrided, .125 radius on the rod and main journals, cross drilled and chamfered oil holes, stress relieved and shot peened. Eagle part number is 440034806000. You could use KB hyper pistons part number KB195-30 for the 377 and 6.0 rod, I've seen these go for $280. with 64cc heads the comp is 12.1:1, using the larger 76cc head you'll end up at 10.5:1.

Here is an example of a typical 377 build up using Victor Jr aluminum heads, Isky solid roller 264/277 cam, Victor Jr intake and BG 750 annual discharge carb the engine made 589 hp @ 6500 and torque peaked 516 @ 5200. At 4800 torque hits 508 and HP is 464, at 5200 516 torque, 510 hp, torque stays above 500 until 6100, at 7000 torque is 432 and hp is 576.

The relatively narrow spread between peak torque and peak horsepower of 1200 rpm would work well with a 4 or 5 speed. But on the street this will be a handful to drive, fun but a handful unless you are only taking it out on weekends. If you choose an auto you'd better plan on at least a 4,000 stall converter, 5,000 to drag race it with an auto. Like the others said run steep gears. I plan to build one of these except with a 3.00 or 3.25 crankshaft and really steep gears.
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post #12 of 12 (permalink) Old Sep 18th, 05, 09:34 PM
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Re: 400 Block 350 Crank ????

...or you could run a 3.25 inch crank from a 327 and make 337 cubes,..or find a 3.00 inch Z-28 crank and make 311 cubes...but boy, would they rev!

But at some point the ability to rev will yield to displacement.

If you're using a std bore 400 block you'd only be gaining 22 cubes over a 350 (+.030) block if both were outfitted with a 3.48 crank.

If you're lucky enough to find a good 400 std bore block, buy a good forged parts,..a 3.75 inch crank, pistons, and rods, and with proper balncing and assembly there's absolutely no reason you can't rev a 406 to 6500 with the same cam you're considering.

My opinion is, the 406 would perform a little better than a 377 and have a wider (usable) RPM range,..which would make her more streetable.

Good luck with your project!
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