Thread: Chevy 302?

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If you take a 327 block and put a 283 crank with 5.7 in rods would that make it a 302? Am i right or am i jsut a dumba$$ Trying to settle an argument with a buddy

Would the 327 need any modificaytions or can u just drop the crank in

Tiger, This little discusion is in full battle gear on another thread here. But with that aside heres the real deal.

Hot Rodders invented the 302 Chevy long before Chevrolet did for there Trans Am racing teams. Just about as soon as there were 283's to play with they were being bored and ported over carb'd and about anything else you could think of. The big trick back in the day was to take your 283 have it bored 1/8th of an inch to 4" thus making a 301.592 Cubic inch motor. Now tiger back in the mid 50's blocks were a lot different than these junky thin wall castings we have today, and many 283 blocks were in fact bored .125 I still have in my shop a set of those pistons marked on the crown .125. They measure exactly 4" so that would make them 283 or 3.7/8 pistons bored .125.

Chevy then in 1967 or 1968 used there 327 or 4" blocks and forged 283 cranks for there legendery 302 motor--- which by the way was actually 301.592

No modifacation is needed to do this Tiger.
Roland

Your rods will hit the cyl. Cut half moons to clear

the rods will not hit anything!!!!!!!!!!!!!

If you want to put a 283 crank into a 327 block, you will need a small journal 327 block, or you could use a large journal 302 crank in a 327 or 350 large journal block to arrive at your desired 302 size. As for a 3.00 stroke crank hitting anything inside the case that a 3.25 stroke clears with the same length of rod sounds very strange to me. By the way, those little 302 engines in the Z/28s were to be respected and would scream. They are awesome!

Scooter, are there thick main bearings to allow the use of a small journal crank into a large journal block? You're the guy who would know.

They were good, for a mini mouse....lots of rpm and lots of noise, decent handling. That's about it. Stock performance:

Handling was razor-sharp, aided by power steering that was both quick and had road feel. Four-barrel 1969 Chevrolet Camaro Z28s could run the quarter mile in 14.8 seconds at 101 mph, but the small-block's shortage of low-end torque was multiplied with the dual-quads, which fed on sky-high revs. Even dropping the clutch at 4000 rpm produced stumble off the line.

Not exactly blistering performance in stock trim.... I had a 67 Firebird, 400 with a 4 speed. It ran 14.30's stock..... The 302 was a lot more hype then anything else, and history has only made the stories go faster..... The Z-28's and the Boss 302's were sold to the public so they would be a legal car for SCCA Trans Am racing, there real home.... Big block cars, then, as now, ruled Super Stock drag racing....

Originally Posted by techinspector1

Scooter, are there thick main bearings to allow the use of a small journal crank into a large journal block? You're the guy who would know.

Back in the 70's both TRW and Speed-Pro listed those bearings in their catalogs,been too many years to remember part #'s.

whats i find very funny, is people will swear by ford 302's but hardly anybody will respect a chevy 302. there were a few 302's that ruled their calss in super stock. dave stricklers is a very good example. and not all of them came with dual 4's.

i dunno maybe im just its easy to get power from, granted sticking it in a 3800lbs car for racing will kill it. keep it light keep it fun. i figure one rebuild in 5 years is a damn good record!

http://www.mecum.com/auctions/lot_de...D=SC0508-66401

Hot rod small journal jobs are 301's, large journal factory style engines are 302's. Don't ask me why, just one of them things!
No magic in the numbers, a 327 or 350 with the same mods will stomp all over their little brother. Class rules were the only reason Chev ever built 'em themselves.

then explain to me why ford built there 302 for well over 25 years ?

COOL DZ 302 http://videos.streetfire.net/video/6...-DZ_156232.htm

dyno video of a 69 chevy 302DZ motor rebuilt to factory specs. In 1969 this motor was rated at 290hp@4400rpm in all actuality it makes 530hp@8500rpm and their were no aftermarket speed parts in this motor. The cam is an exact factory blue print from comp cams.

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SB Chevy Tango

Does a 302 chevy make the torque of a 454, absolutely not. Does it have the visual appeal of a Hemi, absolutely not. Did it have more power than my two barrel 283, better believe it. When the rest of us kids were putting headers on our 283's, and the guy up the street parked his 69 Z/28 in his driveway, we were in awe, when we went for a ride, well, I still remember that car doing things ours would not, so maybe it is just comparing apples to oranges, but it made an impression on me. Then later a buddy bought a 1970 454 SS Chevelle, but that is a different story.