Engine buildup archives ? 307 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChopTop · 06-28-2002, 01:21 AM

Anyone ever do a 307 buildup? Dyno or desktop. I have faith these engines have promise. Some nice heads with 450 cam-Qjet , and what have I got? Thinkin about droppin it in a 2300lb car. I just landed a fresh one. and no I don't need to hear about how sorry your 307 is with 2 million miles and no oil changes thank you.

lukecp · 06-28-2002, 06:07 PM

There was a discussion on this board about a 307 stroker before....
a 307 with a 400SB/383 crank in it. I still think that would be a really
cool, and different engine, if you could figure out the right combo of
rods and pistons to make it work. I think we figured out that it would
be a 333 after being stroked...
It would make tons of torque with that long stroke too

. I saw some
World Products "305" heads designed for 283, 305, and 307 engines
in the Northern Auto Parts catalog. I think they were regular S/R heads.

ChopTop · 06-29-2002, 01:25 AM

We tore down the 307 tonight, whew man!! the bores looked kinda scary IE 8 years of corrosion, the bottom end looked brand new, and I found no sign of turn on the rod bearings. One thing I saw that scared me though,... we poured a little varsol in the valley to help the clogged oil pan drain... I spotted a couple of white cracks just above the bandaids, then as quickly as they appeared they were gone. Do I have a cracked block? Also noted this motor has rods marked O, are these anything special? Do they compare to X rods? Crank looks like new under the lids. If this block is cracked I believe I just found myself a 327 crank. Hmmm.... lets see small journal rods stroked 0.10, bored out 350 block say maybe 90 over, ..... hmmm... naaaaa. Guess I'll have to just think this one over.

06-28-2002, 01:21 AM	#1
ChopTop Registered User Join Date: Jun 2001 Location: KINGWOOD TEXAS Posts: 515	Engine buildup archives ? 307 Anyone ever do a 307 buildup? Dyno or desktop. I have faith these engines have promise. Some nice heads with 450 cam-Qjet , and what have I got? Thinkin about droppin it in a 2300lb car. I just landed a fresh one. and no I don't need to hear about how sorry your 307 is with 2 million miles and no oil changes thank you.

06-28-2002, 06:07 PM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	There was a discussion on this board about a 307 stroker before.... a 307 with a 400SB/383 crank in it. I still think that would be a really cool, and different engine, if you could figure out the right combo of rods and pistons to make it work. I think we figured out that it would be a 333 after being stroked... It would make tons of torque with that long stroke too . I saw some World Products "305" heads designed for 283, 305, and 307 engines in the Northern Auto Parts catalog. I think they were regular S/R heads. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

06-29-2002, 01:25 AM	#3
ChopTop Registered User Join Date: Jun 2001 Location: KINGWOOD TEXAS Posts: 515	We tore down the 307 tonight, whew man!! the bores looked kinda scary IE 8 years of corrosion, the bottom end looked brand new, and I found no sign of turn on the rod bearings. One thing I saw that scared me though,... we poured a little varsol in the valley to help the clogged oil pan drain... I spotted a couple of white cracks just above the bandaids, then as quickly as they appeared they were gone. Do I have a cracked block? Also noted this motor has rods marked O, are these anything special? Do they compare to X rods? Crank looks like new under the lids. If this block is cracked I believe I just found myself a 327 crank. Hmmm.... lets see small journal rods stroked 0.10, bored out 350 block say maybe 90 over, ..... hmmm... naaaaa. Guess I'll have to just think this one over.



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