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i`m about to do a full rebuild on my 307, can i use a 327 crank ? if so are there any benefits over the 307 crank ? any other options ?
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307 engines have a 327 large journal crank, they are the same. The 30 uses a longer stroke crank.
Some people have bored their 307s 125 thou to make a 327 and then fitted a 350 crank to make a 2 bolt main 350 engine.
The advantage of doing this is
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You can also take an aussie 307 out to 377 by using a 3.75" stroke crank. But if it's original for the car keep it stock, and if you want to go bigger use another block eg early HK pre Monaro.
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will the 3.75 inch crank bolt straight up? what conrod/piston combo is needed?
Cheers
Alex
Hyundai's are like rust. They keep coming back
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very good question boom i`d like to know the answer myself, sounds like an interesting way to go.
byron what do you mean by aussie 307 ? mines a 1968 block in a hk prem, if that`s what you mean. would like to know more about taking it to 377. thanks for
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A 377 is simply a 400 crank in a 4" bore block. You can buy brand new cranks ready to go with the mains already turned down to suit. Then you buy either pistons to suit the 3.75" stroke with 5.7" 350 rods, or 5.625" 400 rods. If you use 400 rods you won't |
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answer to your question, i have for sale 385 cube 307 hk short(bored to 4.040 and 3.75 crank,3/4 engine all fresh,just call me, cheers dave.0428566683. also byron 400 chev rods are 5.565"long cheers. Edited by user Sunday, 20 May 2007 6:00:08 PM(UTC)
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Dave what parts (and Brands)used and how much
Dave
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check in parts for sale,under chev engines,all quality parts used,for an extra $1000 will fit set of double humps with rocker gear and intake.freght can be arranged to most places in oz...
cheers dave
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Old age and memory loss starting to kick in early! Must have been thinking about 308 rods.
Is the 3.75" stroker 307 you have using 350 rods or 400 rods? Just interested in how well the 307 bore bottoms handled rod bolt clearancing if you used the 5.7" lo |
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byron,engine shop said all was fine in bore strength,i used 5.565"(400)length stg2 vpw rods(beams polished,sized,matched,aftermarket bolts,etc and machined 400 crank,bottom of bores already cast clearance,350 std height pistons used,thanks for inquiry byr
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Did you have to deck the block? You've moved the pistons 135 thou up the bore, and then dropped them back down by 135 thou by using shorter rods - clever use of cheap pistons! What compression ratio did you end up with?
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depending on chamber size.i have pistons in the hole by .035",im fitting a set of 64cc double humps to her,this weekend,and rollers,to sell.great engine ith genine 307 engine no still attached.
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How'd you go for piston to crank clearance at BDC?
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all fine due to std 400 couhterweights,clears around cam without grinding rods also,due to shorter rod bolts,shoulder lower on rods.balanced up fine.cheers dave
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