Guys getting ready to build a 383 with a stock 350 4 bolt with 30 over bore. What kind of horsepower will the block handle. 600-620 pushing my luck? I need a season out of it. Yes no maybe
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Guys getting ready to build a 383 with a stock 350 4 bolt with 30 over bore. What kind of horsepower will the block handle. 600-620 pushing my luck? I need a season out of it. Yes no maybe
i think 600hp is reasonable if you get good machine work it should live awhile. Probably need aftermarket caps or it would be a gamble. What kind of heads?
Over 600 hp can and has been done but I wouldn't recomend it. You can install billet caps other things to add strength to it, but you still are on the ragged edge. You can get a Dart SHP block and have no worries.
Bob
X2 The added stroke and HP and torque will kill stock caps, A sonic test is a must on any OEM block!!Quote:
Originally Posted by Rodz
A centered block means nothing when sonic testing, I have about 20 blocks with zero core shift but cylinders on one side are all junk or some of the blocks all the cylinders are good except one which makes the block junk for a performance build.Quote:
Originally Posted by parrot69777
On the other hand I have blocks that show alot of core shift but sonic test fine.
Instead of guessing its better to sonic test and do it right!!!!!!!!!!!!!!!!
I sonic test every OEM block that comes through the shop, Shops that don't sonic test and break a cylinder useally have to eat it when it cracks a cylinder.Quote:
Originally Posted by parrot69777
I have a new set of dart platinum steel heads, 215 cc runners, 64 combustion chambers, with some mild port work with a port matched edelbrock super victor.
I am just getting into the sport will be running in an ump mod or a ump sportsman on 1/4-3/8 mile tracks. Trying to make it a budget to start.
I'd like to hear back from you when your block breaks and your motor is a total loss. Racing is expensive and we all want to save money. Gambling on a stock block isn't the place to save money. There's not much cost difference between a race preped stock block and an SHP block. 30 yrs ago when dirt track engines were making 400 hp, it wasn't an issue. 600 hp is pushing the limits. I've seen too many destroyed motors from broken blocks and I'm sure Carl at CNC Blocks has seen way more than I have.Quote:
Originally Posted by jeremyzx900r
Bob
What are your thoughts for the Bow tie blocks, should they be sonic tested? Have run an older 286 block for years.
Thanks
Mike Bulpitt 26B
Any of the GM blocks should be sonic tested even bowtie blocks moreso older ones.Quote:
Originally Posted by 26-62 racing
I apoligize for jumping on your thread, but starting a new one that is very similar would be a waste. How about a stock block engine that sonics OK and has billet splayed center caps. Would it be good to use with a 355 ci, 2 bbl carb, and close to 14 to 1 comp that is just under 500 hp? Thanks for any replies......................
At 500 hp with a 2 bbl I doubt you'll have any problems with a checked block. There's other factors in how far you can push a stock block. Cylinder pressure and RPM are a couple. I still use GM blocks, but over 600 hp and 8,500 RPM, I start getting nervous.Quote:
Originally Posted by 4coil
Bob