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  #16 (permalink)  
Old 11-29-2010, 06:04 PM
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Would i be making a mistake just boring to 4.125 and not bigger? Dart builds and sell short blocks at 4.125.

If i did bore bigger to 4.155 what size heads to use and what cam to keep the same compression and RPM range? If the bore is bigger. That means more horse power, so i can up the ante.

Remember all i have to feed this thing is a 750 holley double pumper new in the box. Lost the receipt. So if i need a 850 or more im out $500 and then im running backwards.

I want to get this right the first time and not have any regrets. iI know once bitten by the bug everyone wants more! Im O.K. with a 700 horse drivable around town toy.

Thanks guys

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Old 11-29-2010, 07:30 PM
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The .030" overbore wouldn't change the power enough to need changing anything, it is only going to add 6 cubic inches, and at a pretty lofty 1.5hp per cubic inch thats only 9 hp. Will add just 0.1 to the compression.

You needed a bigger carb than the 750 from the beginning, but it will get you running and won't hurt power that much. add the HP main body to help if it doesn't already have it, it will get you to 800 cfm with the 750's 1-11/16" throttle plate. 850-1000 hp would be more what you need when you can get it.

I've only dealt with the Little M, all it needed was honing to size. I haven't used the SHP yet. I guess you would need to let your machine shop take a look at the block and let them guide you as to what it will need for bore size, and then buy parts accordingly
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Old 11-29-2010, 08:40 PM
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Thanks. Ill put the parts buying on hold for a while. I will keep you all posted as i progress. It might be a while, Christmas is a round the corner.

HAVE A BLESSED AND MERRY CHRISTMAS.
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Old 11-30-2010, 07:16 PM
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Ericknova72 i sold my carb and i have a question for you. you said i needed 800-1000 hp for my set up. So im thinking the 950 hp #hly-0-80676 is the one for me?

I just wanted to make sure this carb can handle all day driving around town if needed and not cause me any problems. Im aiming to build this car to drive 80% and race 20% off time with as little of tuning or maintenance as possible.

As always thanks again.
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Old 11-30-2010, 07:29 PM
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I have seen a lot of carb specialist say to stay away from the Holley sold 950 because it isn't really a 950, it is only really about an 830 cfm. Makes sense when you realize it is a 750 main body with an 850 size baseplate ...how could it be 950?? Just marketing hype from Holley.They say to use either a 850HP or the 1000HP from Holley, or get a custom built carb from a specialist. ProSystems and QuickFuel seem to be the most popular in my area, most of us use ProSystems.
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  #21 (permalink)  
Old 12-12-2010, 10:35 AM
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On my cam choice which is compcams xr294hr. Comp states that the suggested rocker size is 1.5. So if i use a 1.6 rocker will it help me or hinder me? how so?

The maximum lift on the heads im using is 0.620
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Old 12-12-2010, 12:46 PM
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Quote:
Originally Posted by machine shop tom
The bores on the SHP block will be .004"-.006" undersized, with the out-of-round making the difference the total in each cylinder. Boring to 4.125" will leave little to clean up the boring tears and such and honing it will require a GOOD honing machine. Boring to 4.145" or 4.155" isn't such a bad idea. The bores on the SHP blocks are quite thick and can take a .060" overbore (if necessary down the road) with ease and even more with no problems.

BTW, have the cam tunnel bores and main bores checked sizing and alignment.

Just to be sure.............

tom
Good info Tom and I might add have the lifter bores checked for clearance as they seem to come on the tight side and most SHP blocks need the lifter bores honed.

Have the block decked to 9.000 and have the cylinders plate honed to size.

The Dart 215 heads are good choice but a .520 lift thats not much for a good flowing set of heads.
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