Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: cdp]
#180747
01/01/09 07:49 PM
01/01/09 07:49 PM
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Joined: Mar 2003
Posts: 1,102 Melbourne, Florida
Florida_70Bee
super stock
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super stock
Joined: Mar 2003
Posts: 1,102
Melbourne, Florida
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Quote:
I'm thinking of building my 383 HP to a Blueprint/Purestock spec. It will go in either a 70-Bee or RR 4spd.
I'm curious about how to get the 9.5 cr. with the limited pistons and CC's.
I think I have the 2315 pistons and the depth is at .105 in the whole. I can't see a 79.5cc head helping much (apx. 8.3).
How do I accomplish this? Do I deck the block .070-.080 to make it work?
CDP,
I have done this same combo in my 70 Bee
To get the C.R. up you will need to deck the block and mill the heads and I think Speed Pro offers a correct flatop piston
Here are some specs on my combo
The block is the original std bore 383 I am using the original cast flatop pistons standard bore. Speed pro plasma moly rings The block has been decked to a piston to deck clearance of -.006. (NHRA stock elim minimum specs are -.004 (for a 70 383 335hp) in untouched form I measured the piston to deck at -.050 I am using a Fel Pro steel shim gasket for a 413 which has a compressed thickness of .020 The heads are stock unported 906's with stock size 2.08/1.74 valves with a good valve job. Additionally the heads have been milled to 80cc's (the NHRA minimum is 79.5cc's and in untouched form they were 88cc's) All this adds up to a measured compression ratio of 10.12:1. This number would be higher with a .030 or .060 piston. Originally in untouched form I measured the CR at 8.44:1 (a far cry from it's 9.5:1 advertised CR.
The cam is a Mopar Performance stock resto cam for a 440 6 pack (same dimensions as the original 383 magnum cam except it uses a 3 bolt cam gear instead of the original 1 bolt) The intake is the unported original. The carb is the original 585 cfm holley The converter is a dynamic 11 inch that stalls at 2300 (like the original converter The ignition is a combination of Mopar Performance elctronic and FBO Ignition Box, and Coil
The exhaust is a TTI 2 1/2 H pipe with Dynomax Ultra Flow Mufflers I am running a 4.10's in the rear and I am using a pinion snubber and I clamp the front segment of the original springs.
The car weighs between 3975 and 4015 lbs with me in it depending on the fuel load. I leave the line at around 2000 rpms and roll into the throttle (I don't stab it at green as I am running F70-14 Polyglas's) and shift between 5600 & 5700 and it goes through the traps at 5600 rpms.
I hope this helps
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: Florida_70Bee]
#180748
01/01/09 08:11 PM
01/01/09 08:11 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I was going to say to get in touch with Andy as his 70 Bee 383 Pure Stocker runs great. But he (Andy) beat me to it. Ron
Last edited by 383man; 01/01/09 08:11 PM.
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: Florida_70Bee]
#180749
01/01/09 08:11 PM
01/01/09 08:11 PM
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Joined: Feb 2003
Posts: 3,691 MO
cdp
OP
master
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OP
master
Joined: Feb 2003
Posts: 3,691
MO
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Wow...what an answer! I think you own the Red-B, right? My block is .040 over and is a new rebuilt short block I got many years ago and never did anything with it.
My intentions were using a 70-B, 4spd that I have now. But it needs a resto. I was thinking of buying an average driver car and doing a switch.
Ironically, my buddy a few blocks away has a 70-B thats 5k original miles. It was hit when new and sat all these years. Its an F5 red, black C-stripe, column shift, bulge hood, post car. We were looking over the motor during tear down and the pistons are way down. He pulled the pistons out before I got to measure the depth. Everything is so nice inside, we're just doiong rings only on the short block and reusing everything but the oil pump, fuel pump, and water pump.
Thanks for all the info!
What are your times?
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: cdp]
#180750
01/01/09 08:11 PM
01/01/09 08:11 PM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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The NHRA spec for the 1970 383 is .004" below deck. I guess you could cut .100" off the deck. I know they used to cut that much off the SS Hemi blocks, but not sure about the 383 blocks.
They also list other legal pistons for Stock. I don't know if all these will work for Pure Stock?
383 60-71 TRW L2315F TRW L3057F SEALED POWER 2257P ROSS 74233 CP PISTONS M17-CP
Floyd Lippencott IV
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: cdp]
#180752
01/01/09 08:50 PM
01/01/09 08:50 PM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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Based on what the Florida B said, you might have to bore and hone the block for your pistons and check the deck height before decking the block. It looks like he took off less than .050". As far as the intake faces, you can't cut the intake face on the head into the valve cover bolt holes. The good part about cutting the intake face is that you reduce the port volume. NHRA lists the Minimum Compression Height for these pistons at 1.900". I think the TRW piston is around 1.915" if I remember right.
Floyd Lippencott IV
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: scatpacktom]
#180754
01/02/09 10:17 AM
01/02/09 10:17 AM
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Joined: Feb 2003
Posts: 3,691 MO
cdp
OP
master
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OP
master
Joined: Feb 2003
Posts: 3,691
MO
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Yes, checked with a dial indicator last night and a digital calper (.105).
Ironically, my 69.5 440 for my RR is also .105 in the whole. I've heard this is common for the 2266 pistons on a 440.
I was thinking of using the KB162 piston, even though they are not spec'd for NHRA. Decking the block, etc, etc, could get expensive and if I get too much in the motor, I may as well up the compression and go with stealth heads, etc. I may pull a piston/rod assembly out and compare them to my buddy's stock motor. Its just now been assembled.
NHRA doesn't exactly run events here in KC, but I thought it would be cool to see what a "stock" 383 could really do.
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: cdp]
#180757
01/02/09 11:42 AM
01/02/09 11:42 AM
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Joined: Jan 2003
Posts: 3,103 Phila Pa
scatpacktom
master
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master
Joined: Jan 2003
Posts: 3,103
Phila Pa
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It wouldn't cost that much from where you are I wouldn't think.No matter what you are gonna want to get the engine balanced.The fact that it wasn't would make me look really hard at the rest of it for quality issues.Having 8 bushings put in the small ends is not that expensive and in your case it would be a win win situation.As it stands right now you have the potential to have a very low compresion dog on your hands
You may spend some money on your heads though
Last edited by scatpacktom; 01/02/09 12:06 PM.
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: scatpacktom]
#180760
01/02/09 07:24 PM
01/02/09 07:24 PM
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Joined: Feb 2003
Posts: 10,227 Someplace you aren't
SomeCarGuy
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 10,227
Someplace you aren't
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This sounds like way too much hassle since you aren't class racing. A nice idea but why not just do the easy way(s) and go faster?
I want my fair share
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Re: anyone run a Purestock/NHRA Blue print 383-B-body?
[Re: cdp]
#180765
01/04/09 12:25 PM
01/04/09 12:25 PM
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Joined: Jan 2003
Posts: 14,513 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,513
So. Burlington, Vt.
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i'm not really sure how you'd end up with a set of TRW L2315's down the hole .100+, unless the block was MUCH taller than the 9.98" spec.
as i recall, i decked my block around .035 to get the pistons to .018 above the block(crank stroked to 3.388).
based on your current deck clearance, assuming a typical BB OE chamber volume of 88cc's, and using a steel shim head gasket.....you'd be at about 7.8cr right now.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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