Anyone do a 400 based 302? - Team Camaro Tech
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post #1 of 15 (permalink) Old Sep 24th, 19, 01:26 PM Thread Starter
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Wiley E. Coyote
 
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Anyone do a 400 based 302?

With the lack of tq and guys worrying about hurting their 302 why not take a 400 block, run your 3.5 stroke solid xxx cam and slap a 302 aur cleaner on it?
Anyone thats had one of these knows how brutal the torque can be on them too much fun.



Curious, somoene here has done it?
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post #2 of 15 (permalink) Old Sep 24th, 19, 01:39 PM
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Re: Anyone do a 400 based 302?

I built a 400 but not to 302 specs it was a 406 & was it a torque monster. I puit it in a 82 Vette & it was a blast to drive, approx 400 hp & 500 ft/lb torque. Sold car sans engine & now my son wants to put it in his truck.
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post #3 of 15 (permalink) Old Sep 24th, 19, 03:00 PM
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Re: Anyone do a 400 based 302?

I would buy a BluePrint 400. Fresh block stronger than the stock block by far.

https://blueprintengines.com/product...etor-bp4002ct1

Drop on manifold, install distributor and add your old air cleaner and enjoy the drive.

You can store the original DZ 302 for posterity, in the same crate that your 400 arrived in.

Big Dave
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post #4 of 15 (permalink) Old Sep 25th, 19, 07:48 AM
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Re: Anyone do a 400 based 302?

been doing the 400, 421, 434, 406 thing for 20 years. never considered de-stroking though. i dont need to spin 7,000 RPM, just pull stumps and front wheels
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post #5 of 15 (permalink) Old Sep 25th, 19, 08:05 AM
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Re: Anyone do a 400 based 302?

Quote:
Originally Posted by bhodgdon400 View Post
been doing the 400, 421, 434, 406 thing for 20 years. never considered de-stroking though. i dont need to spin 7,000 RPM, just pull stumps and front wheels
Pulling 2nd gear from almost a stop at the auto-x is nice,then going to 6,500rpm. I should have went solid lifters for another 500rpm or so.
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post #6 of 15 (permalink) Old Sep 25th, 19, 08:27 AM
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Re: Anyone do a 400 based 302?

Quote:
Originally Posted by ilikeike View Post
Pulling 2nd gear from almost a stop at the auto-x is nice,then going to 6,500rpm. I should have went solid lifters for another 500rpm or so.



exactly, why de-stroke and take away the advantage of a big cube small block? with todays cam profiles and parts, the right 421 / 434 can spin to 7,000 safely and still pin you in the seat at 2,500.

just dont see the fun in spinning a little motor to 8,500 anymore. especially not where i drive 95% on the street....i'd never see the benefit
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post #7 of 15 (permalink) Old Sep 25th, 19, 09:16 AM
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Re: Anyone do a 400 based 302?

A 302 was built as a 302 because it was competing in the five liter motor size, against European five liter sedans, That is why the 302 exists, it was a sports car ready to race; beating up on Jaguars and the occasional Mustang with their 302, until American Motors handed them their heads for three years in a row thanks to Donohue. After that Ford's Roush Racing dynasty won the next six season in a row which is why Chevy stop sponsoring the race.

If you wanted to go TransAm racing in the seven liter class you raced a 'Vette: but you were competing against Ferrari, a whale tail Turbo Porsche six bangers and again Jag this time powered by with a V12 instead of an in-line six cylinder. Not to mention Lamborghini, Maserati, Audi and BMW all running V12 turbo powered cars. Wasn't much fun for the 'vette teams.

They claimed it was a driver's race but the cars seamed to matter more than the driver ever did at least from a spectator's point of view.

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post #8 of 15 (permalink) Old Oct 17th, 19, 01:13 PM Thread Starter
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Re: Anyone do a 400 based 302?

Wouldnt destroke one personally but some are stuck on the rev quick thing (whatever)

are the BP blocks as hard as a Dart or GM?
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post #9 of 15 (permalink) Old Oct 17th, 19, 04:23 PM
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Re: Anyone do a 400 based 302?

My 1st I wouldn’t worry about hurting my 302. If I was 2nd choice would be 406 SBC badged as 302 next would be 302 badged 383.

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post #10 of 15 (permalink) Old Oct 17th, 19, 06:19 PM
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Re: Anyone do a 400 based 302?

Quote:
Originally Posted by Larger Dave View Post
I would buy a BluePrint 400. Fresh block stronger than the stock block by far.

https://blueprintengines.com/product...etor-bp4002ct1

Drop on manifold, install distributor and add your old air cleaner and enjoy the drive.

You can store the original DZ 302 for posterity, in the same crate that your 400 arrived in.

Big Dave

I like this approach, but would the finned aluminum 302 valve covers fit as well? I have no clue if there would be any valve train interference.

Z282NV

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post #11 of 15 (permalink) Old Oct 17th, 19, 06:22 PM
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Re: Anyone do a 400 based 302?

I'm from the " there's no substitute for cubic inches" school so destroking a 400 makes no sense to me. That said whatever size motor ends up in my car it will be "dressed" as a 302.

Jeff
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post #12 of 15 (permalink) Old Oct 17th, 19, 07:31 PM
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Re: Anyone do a 400 based 302?

Quote:
Originally Posted by Z282NV View Post
I like this approach, but would the finned aluminum 302 valve covers fit as well? I have no clue if there would be any valve train interference.
They did on my 406 with BBC PAC valve springs 1.6:1 roller rockers (chrome-moly body, not the fatter aluminum body), and 3/8th inch diameter push rods. Shame Photo For Money screwed every one or I could show pics.

Will admit took grinding oil drippers and thick Moroso permanent steel core silicone rubber valve cover gaskets to clear.

Big Dave
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post #13 of 15 (permalink) Old Oct 17th, 19, 07:38 PM
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Re: Anyone do a 400 based 302?

Not sure why people think a stroker won't RPM. My 4" stroke 427SBC has no problem bouncing off the 8,000 rpm limiter. On this pass it does it while in the burnout as I shift from 2nd to 3rd. The shift light was set at 7,200 but the shifts didn't happen until about 7,500.

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post #14 of 15 (permalink) Old Oct 18th, 19, 09:04 AM
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Re: Anyone do a 400 based 302?

You can run a de-stroked 400 by using a 350 crank.You get a 377 cubic inches.with an engine that likes to rev upstairs. But it depends on what the car is built for And the rules as well. I have my friend and build an supercharged engine for my 1979 Z-28 ProTouring car. It has a Chevrolet "bowtie block" bored .040 over with a Scat stroker forged crankshaft .with all the "toys" I can rev it up to 6500 rpm. It makes around 500 HP with 15lbs of boost .
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post #15 of 15 (permalink) Old Oct 18th, 19, 11:47 AM
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Re: Anyone do a 400 based 302?

NHRA's new 840 cubic inch Mountain Motor Pro Stock class shifts at 8,400 due to the size (weight) of the pistons and the length of the stroke. Sonny Leonard's 903 IHRA Mountain motor with five stages of nitrous to helkp prevent blowing off the tires revs the same. So if you want to wind it up a long stroke will twist as high as a SBC it just is going to cost you more in replacement costs.

The Sonny 903 lists for $104,000 complete. Which is a lot more than the $35 bucks I used to pay every week for a Power Pack 283 out of the junk yard to replace the one that launched the rods through the block in my '55 Chevy when I used to twist them to ten grand.

All depends upon how you want to drive it and how deep your pockets are (It also helps to own your own wrecker and a garage with all of the equipment to work on a car like I did back in the seventies).

Big Dave
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