374 Olds 350 stroker build
- Thread starter olds307 and 403
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I found a Mahle 2618 forged 4.065" bore, 7.9cc dish, 1.550" compression height, 1mm/1mm/2mm ring pack piston. That equals 363 CI, interesting. The Icon piston is also 2618, older 1.5mm ring pack and 15.2cc dish, needs 62cc chambers for 9.6 to 1 with 0 deck, even with the larger bore. I would not mind polishing the combustion chamber, nice and smooth. According to the compresion height calculator, with the 3.5" stroke and 9.33" deck height, a 1.58" compression height is needed. Either piston is .019" to .030" in the hole. If this is right, I would deck it .020" and use a .030" MLS head gasket. Not looking for a max ci build, using the huge pile of parts I have for a reliable, cool running street and maybe a once or twice a year strip build. The bores look really good, hone to fit should save some $$$, will see what Parkland Engine Rebuilders say.
Motor out, all pulled apart. All the rod bearings were scored, surprisingly the bent rod bearing was no worse. The cam had multiple lobes with wear compared to others, failing on multiple lobes. Not bad for a 45+ year old short block, $120 for the complete 76 350 with great oil pressure and compression when bought, ran for probably 5 years. Fully rebuilt #6 heads with 2.07/1.56 valves with a bowl hog cut, $400 cost, was $1200 worth of machine work and parts supposedly. It was $225 US for the cam and lifters. I used the garbage Cloyes Street roller timing set, they were slack new, not going that way again. A pile of snow Tuesday so I will take the block Christmas Eve, if they are open and the call goes well tomorrow. Pics in a few.
Well all the bearings were toast, just the rod bearings were worse. Intake valves are 2.07 confirmed by the caliper. They are close to the edge of the chamber. There must be a burr on the edge of the exhaust valve, could not pull the valve out, moves fine till the very edge
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The stem is mushroomed. Nothing a die grinder won't resolve.
Those bearings look great (sarcasm), thank you FT cam (no sarcasm).
Those bearings look great (sarcasm), thank you FT cam (no sarcasm).
Yeah, I just to flip it over and carefully hit it with the dremel. I should just need positive seals and roller cam springs. I was going to break it in half being a lightweight non nodular POS. It can be reground, so it may go where the 330 crank currently is. A huge difference in weight between the two. I hope my 73 350 has the "N" crank. Yeah flat tappet cams suck, all of a sudden started ticking bad. I was using SL oil and a ZDDP additive. It was only a mild 214/214 .472/.472 on a 110 LSA.
Talked to Parkland, talked to Dean I believe. They are open till Wednesday and then closed to January 4th. At least a couple weeks till they can touch it. I will try and kiss the wife nice for her to drop it off or I will take Wednesday off. The wrench in it all, there is supposed to be 40 cm of snow tomorrow. Our family is famous for going out in the worst conditions possible. I guess the 4x great Uncle, Dr John Rae, the Arctic explorer, is a part of us.
I did a quick clean up of the oil pan and put it back on the motor, so it won't be sitting on the mains during transport. The SB pan clears the Halo, which is good, the BBO replacement pan should allow a little more room. I will lay down a tarp, put the motor in the back on a tarp and another tarp over top weighed down. I will fog the motor with storage spray. I am hoping my Wife can drop it off tomorrow but it will depend on road conditions.
I don't understand why you would go through all of this effort when a junkyard 6.0L LS with a camshaft would make the same power for significantly less time and money...
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