CRG Discussion Forum

Camaro Research Group Discussion => Mild Modifications => Topic started by: tom on May 07, 2008, 11:47:59 AM

Title: thinking about a modern 302
Post by: tom on May 07, 2008, 11:47:59 AM

Just wondering about the potential for a "modern" 302. If I recall correctly the 302, 327, and 350 all share a 4.00 bore. Any thoughts on recreating the 302 performance using an available 350 block, and hooking it up to a modern very high stall auto trans that could slip all the way into the high rev power band of the 302.

What I am thinking of is a land speed project in the 5 liter automatic trans class.

Tom

Title: Re: thinking about a modern 302
Post by: hotrod68 on May 08, 2008, 03:57:03 AM

You just need a crank with a 3" stroke and the pistons with the right pin height to make a 302 out of a 350--no prob there. Imagine a 302 with 6" rods! And you'd need a converter with at least a 3500 stall to make the 302 launch in its powerband. I'd like to see that!

Title: Re: thinking about a modern 302
Post by: tom on May 08, 2008, 10:58:33 AM

I was thinking more like 4000 plus stall speed on a modern overdrive auto with the lockup converter and some long gears in the diff. throw in a couple miles to get up to speed, and some aero work..........

Title: Re: thinking about a modern 302
Post by: 1968RSZ28 on May 08, 2008, 04:51:57 PM

Quote from: tom on May 07, 2008, 11:47:59 AM

Just wondering about the potential for a "modern" 302.

The "old reliable" 302 would smoke it!!     ;D     ;D     ;D

Title: Re: thinking about a modern 302
Post by: hotrod68 on May 09, 2008, 04:27:58 AM

Old Reliable is a diety....lol   That thing launches like a dang rocket! Gotta love them 4-speeds and screaming 302s.

Title: Re: thinking about a modern 302
Post by: seeburg220 on May 13, 2008, 02:13:04 AM

What compression ratio are you thinking of on this?   I have a 350/350 hp Vette, and it was stock 11:1.  I have since bored it .030 over, making it higher than that.   I have to add lead to get it to not ping.   Just something to consider.

Title: Re: thinking about a modern 302
Post by: tom on May 13, 2008, 12:17:04 PM

I was thinking that not having to be correct for the ECTA meets there would be an opportunity to build a modern 302 that would work in the 5 litre class. The high reving along with the right gears in the rear could make a high top end combination. I don't know what compression I would be looking for, I was kind of hoping for some feedback here.

I was thinking that I might be able to compete with going broke on period correct parts.

Title: Re: thinking about a modern 302
Post by: GaryL on May 13, 2008, 06:53:31 PM

What are the advantages of a "modern" 302?

Title: Re: thinking about a modern 302
Post by: tom on May 13, 2008, 07:38:54 PM

Not needing date correct original GM parts should be less expensive, newer technology heads, intakes, roller cam,  ignition, etc. may offer more power. Besides I don't have a Z and I don't have a DZ block.

Tom

Title: Re: thinking about a modern 302
Post by: JKZ27 on May 26, 2008, 02:42:56 PM

Eagle makes a 3" forged crank!

John

Title: Re: thinking about a modern 302
Post by: tom on May 26, 2008, 05:40:53 PM

John,

Thanks!

Title: Re: thinking about a modern 302
Post by: melav8r on July 02, 2008, 06:45:44 AM

The '68 and '69 302 used a 350 block, '67 used a 327 block for that matter, only difference was a 3.00" stroke compared to the 327's  3.25" stroke and the 350's 3.48" stroke.
have fun.

Title: Re: thinking about a modern 302
Post by: firstgenaddict on July 06, 2008, 12:20:27 AM

IF you could get a 6.20 Rod in there you would have a 2.06 rod ratio... and a very light reciprocating assembly (the compression height of the piston is going to be short, yielding a shorter lighter piston) which will maximize the power output, lightening the recip assem minimizes the parasitic power loss of accelerating 8 pistons from a dead stop 2 times per revolution... (at TDC and BDC the piston comes to a complete stop), therefore any reduction in the mass, having to be accelerated, is going to yield a net power increase...
Another factor is the higher rod ratio allows the engine to rev higher with less side loading... if the effective RPM's are increased then the whole mass acceleration issue becomes an even larger factor...   

Title: Re: thinking about a modern 302
Post by: L78 steve on July 07, 2008, 03:57:42 PM

Why would you want a loose converter if  you are looking for top end.Loose converters are for hole shots.Just gear it for the max RPM at the speed the HP will accommodate.

Title: Re: thinking about a modern 302
Post by: firstgenaddict on July 30, 2008, 06:08:38 AM

My dad has been talking about building a Flat Head powered car for the ECTA...

Title: Re: thinking about a modern 302
Post by: tom on July 30, 2008, 11:36:15 AM

Sounds cool. Not a lot of folks seem to be aware of East Coast land speed racing. I don't expect great success, more interested in just playing the game.

Title: Re: thinking about a modern 302
Post by: pdq67 on November 27, 2009, 03:57:18 AM

Tom,

The today way to do this is to use a 400 block and install a 3" or a 3.25" crank in it and add a good set of free flowing aftermarket heads.

And I dearly loved my old junk301 up around 7,500 rpm!!

pdq67

Title: Re: thinking about a modern 302
Post by: pdq67 on November 27, 2009, 08:20:48 PM

Back again,  I chased down a supplier of 6.25" long forged SJ rods so that I could use 6" rod, 350 pistons to make another junk301.

I just don't get why stock 302" and .030" and .060" overbore pistons are so scarce???

Heck, back in the day W/JCW sold el-cheapo, 1/8" overbore domed 283 cast pistons that I had in my junk301 for like $39.95/set along w/ cheap rings for like $5.00/set.  Badger or Simplex pistons?

pdq67