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Old 07-07-2012, 07:34 PM
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15:1 383 stroker using 70s block

The block is a factory 4 bolt main 1971 casting. It has been shot peened bored and stroked. It has been bored .040 over with je .080 pistons. Eagle alloys 4340 crank and 4340 h beam rods. It has a cloyes timing cover and adjustable timing chain set. There is a comp cam i have the cam card just dont remember the proflie off the top of my head. Comp cams solid roller lifters molly .125 longer push rods. Crane cams gold series roller rockers with 7/16 studs and crane cams glod series stud girtles. Brodix track one heads that have been decked to 52cc and ported and polished. Brodix high rise intake with a race demon 1040 carb.

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Old 07-07-2012, 07:55 PM
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thomjohn98.....you did know that this thread is over 2 yrs. old??? don't know how the info you gave has anything to do with the op's post anyway??......and I might ask is how do you squeeze .080 pistons into a .040 bore??
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Old 07-07-2012, 08:15 PM
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[QUOTE=cam383aro;1231177]The reason I don't duplicate there motor is because I'm not trying to build the same thign my friend built... Wanna make it my own, if we copied what other people did and don't make our own design we would still be driving model Ts...

This threads old He never built it!!!!This is 2 years old and hes on another thread today asking about his first 383 build How about combining them?

PJ - This thread is now split from the original OP's thread he posted in, it's all his now...

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Old 07-07-2012, 10:27 PM
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700 hp 383,,,

recipe==simple actually

Contact Scott Shafroff or Jeff Lukovich.Buy their 434 bracket/street motor.Both are honest guys with good products.Engines start at 11k before upgrades.Both these guys offer 850 HP 434s though they would be terrible on the street.Both of these guys offer a 630 ish HP 434 that is better for street use though even they use big solid rollers.
If you want specs,I have that too
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Old 07-09-2012, 04:47 PM
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Quote:
Originally Posted by 327NUT View Post
thomjohn98.....you did know that this thread is over 2 yrs. old??? don't know how the info you gave has anything to do with the op's post anyway??......and I might ask is how do you squeeze .080 pistons into a .040 bore??
The .080 is the dome height on the piston. I responded to the post as I have a 383 that is running 15:1 compression and I read old posts, and figured others do too.
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Old 07-09-2012, 09:44 PM
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Quote:
Originally Posted by thomjohn98 View Post
The .080 is the dome height on the piston. I responded to the post as I have a 383 that is running 15:1 compression and I read old posts, and figured others do too.
The thread this was split from was a build plan for a "700ish hp 383", you claim to have one? So, what's it used for, what fuel are you using and what's it in?

Also, tell us how you get 15:1 compression out of a dome that is .080 inches?? A domed piston that has a .100 inch dome is only -0.50 cc in volume. In a 383 motor that calculates out to 9.73 with 76 cc heads, and 11.07 with 64 cc's.
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Old 07-10-2012, 12:32 AM
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And is it a 23* headed motor?
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Old 07-10-2012, 04:05 AM
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Quote:
Originally Posted by 68NovaSS View Post
Also, tell us how you get 15:1 compression out of a dome that is .080 inches?? A domed piston that has a .100 inch dome is only -0.50 cc in volume. In a 383 motor that calculates out to 9.73 with 76 cc heads, and 11.07 with 64 cc's.
If he has a 0.041" quench, a 0cc dome (the 0.080" dome about equals the valve relief volume, give or take), and a 52cc chamber, he is just over 14.2:1.

BTW, some compression ratio calculators (and catalog info/advertisers) use a negative number for a dome (i.e. "-5cc"), others use a positive number. Be sure to check the calculator and the advertised figures to be sure they're not 'backwards'.
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Old 07-10-2012, 07:22 AM
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Originally Posted by cobalt327 View Post
If he has a 0.041" quench, a 0cc dome (the 0.080" dome about equals the valve relief volume, give or take), and a 52cc chamber, he is just over 14.2:1.

BTW, some compression ratio calculators (and catalog info/advertisers) use a negative number for a dome (i.e. "-5cc"), others use a positive number. Be sure to check the calculator and the advertised figures to be sure they're not 'backwards'.
I understand the calculations using a negative, I overlooked the 52cc heads in the OP's post. I was homed in on the tiny .080 "dome" (not valve reliefs) he listed.
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Old 07-10-2012, 08:38 AM
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Quote:
Originally Posted by 68NovaSS View Post
I understand the calculations using a negative, I overlooked the 52cc heads in the OP's post. I was homed in on the tiny .080 "dome" (not valve reliefs) he listed.
Yeah, I figgered you would be aware of the differences between calculators, etc. The info was more for the OP should he want to recalculate his CR, which is bound to be lower than what he thinks it is.
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