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#1
10-18-2022, 08:47 AM
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Are the 55-58 Blocks as thick cylinder walled as the 59 389 ?
Just curious if anyone knows the overbore potential on early 55 -58 blocks vs the better known 59 389 being the thickest strongest ones.
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63 Catalina coupe 467 cid budget drag car 11's 1/4 , 7.20 1/8th pump gas n/a 66 Star Chief Executive 57k mile 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd 2019 Chevy Spark petrol car 38 mpg |
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#2
10-19-2022, 01:09 AM
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Back in 1961 I bored a '57 block 3/16" over and ran it thousands of miles as a Tri-Power 381 c.i. But in recent years, with wall thickness measuring available, a couple of '58 blocks were only safe thicknesses at 1/16" overbore. I guess I was just very lucky with the '57.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
| The Following User Says Thank You to Jack Gifford For This Useful Post: | ||
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#3
10-19-2022, 07:25 AM
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Thanks for that Jack , eventually I should acquire a 56 317 and HD 3 spd from a buddy's Chieftan and may use one day for some kind of rat rod hot rod idea and that trans is suppose to be super strong too but thought at minimum bore the 317 to 4.0 so its right at a 327 with the 3.25 stock crank but more is always better if there is a weird stock piston long rod odd ball combo that could be done as well I was trying to figure out if a long rod combo with a 301 piston could be done as well I have spare 9.3 housing that has leaf perches on it for a 55-59 pick up
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63 Catalina coupe 467 cid budget drag car 11's 1/4 , 7.20 1/8th pump gas n/a 66 Star Chief Executive 57k mile 69 Le Mans 2 dr HT 350 85k mile 15 sec 1/4 69 Firebird 400 Burgandy/Black 70 Olds Rallye 350 F85 4 speed 3.91's 70 Olds Cutlass Cruiser Red Wagon 350 101k miles 15 sec 1/4 12 sec w 455 74 Cheyenne Super C10 LWB Gen 6 454 w ZZ502 cam 3.07gear 13.1 1/4, 8.3 1/8 2020 RAM 1500 SLT 4x4 5.7 A8 Hemi 2007 Hummer H3 3.7 liter turd 2019 Chevy Spark petrol car 38 mpg |
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