ALL New PRC Stage 2.5 5.3L Head Results!!!!

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Jan 3, 2007 | 04:40 PM

#61

erikthegoalie

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From: Margate, FL

mine come tomorrow...i am throwing them on with an MS3 and a 90/90 with 42# injectors and a racetronix....i am eager to see what happens! i get tuned next weekend...

Jan 3, 2007 | 04:47 PM

#62

erikthegoalie

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From: Margate, FL

wait a minute...i think i ordered them with the 2.04" valve....i was told it would fit with stock gaskets, **** did i just screw up, i DO NOT want to flycut....

Jan 3, 2007 | 06:36 PM

#63

ls2 bait

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Quote:

Originally Posted by erikthegoalie

wait a minute...i think i ordered them with the 2.04" valve....i was told it would fit with stock gaskets, **** did i just screw up, i DO NOT want to flycut....

ill be curious to see. i want them with my torquer 2 but id like to either mill them a bit or run a thinner gasket and bump the cr up a hair if it will clear. im waiting til ur cars done.

Jan 3, 2007 | 06:49 PM

#64

erikthegoalie

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From: Margate, FL

bad news for me..just found out the 2.04 WILL NOT clear..****..this means i have to send my heads back, they get here tomorrow , and hope that TSP can send me a set with the smaller intake valve in time for tuning next weekend...****

Jan 3, 2007 | 08:43 PM

#65

bad6as

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From: Maryland

2.02 vs 2.04 valves to me does not seam like a huge amount.

if a ms3 on what lsa/icl? fits with 2.02 but not 2.04 how much room is left with the 2.02 valve?

Jan 3, 2007 | 10:02 PM

#66

erikthegoalie

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From: Margate, FL

i know that is what I was thinking...I am going to mention that when I talk to TSP tomorrow

Jan 4, 2007 | 08:22 PM

#67

NHRAFORMULA00

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From: Manteno,illinois

.085 INTAKE .095 EXHAUST, this is what TSP told me over the phone before i ordered the heads and cam.

Jan 4, 2007 | 08:24 PM

#68

bad6as

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well does a 227 with .639 on a 109icl have less or morw ptv then a ms3

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Jan 8, 2007 | 08:24 PM

#69

Brian Tooley Racing

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From: Bardstown, KY

Quote:

Originally Posted by erikthegoalie

i know that is what I was thinking...I am going to mention that when I talk to TSP tomorrow

Well, a valve that is .020" bigger on the diameter is .010" bigger on the radius, and on a 15 degree angle yeilds .0025" difference in P to V clearance. Hope this helps.

Jan 8, 2007 | 11:26 PM

#70

JimMueller

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From: Casselberry FL

Quote:

Originally Posted by Zach@Texas-Speed

Pictures and Flow Sheets will be up shortly!

This was posted 2 months ago. Would someone please post the complete flow numbers for these heads, as well as port volumes, preferably with the 2.02 intake? I'm waiting to get these numbers to Patrick Guerra to order a matching cam. I requested the data from Jason once via PM, spoken with Jon twice, PM'ed Jon twice and he said he needed to get the spec's from Jason when he returned from Vegas yesterday.

Are any of the owners getting flow sheets with their heads? If they're top-secret, then someone else will definitely get my business.

Also, are the assembled PRC springs already shimmed to within .050 coil bind or do I need to do it myself?

Last edited by JimMueller; Jan 8, 2007 at 11:35 PM.

Jan 9, 2007 | 07:17 PM

#71

erikthegoalie

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From: Margate, FL

what length push rods were used in this set up?

Jan 21, 2007 | 03:02 PM

#72

Red99TA

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From: Topeka, KS

So how about the dyno graph showing hp/tq vs. rpm? You've got it saved you just need to change the axis and post up!! Also what about the promised flow sheets? I'm still looking for some heads to get me over 450RWHP. I'm at 427 now so I only need a little more

Jan 21, 2007 | 11:46 PM

#73

Xtnct00WS6

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From: Sterling VA

Quote:

Originally Posted by Brian Tooley

Well, a valve that is .020" bigger on the diameter is .010" bigger on the radius, and on a 15 degree angle yeilds .0025" difference in P to V clearance. Hope this helps.

Wow! That's good info to know! Thanks

Jan 22, 2007 | 08:56 PM

#74

ExceSSive

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From: Gateway International Raceway

very nice

May 7, 2007 | 01:58 PM

#75

jimmypop13

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From: SPRING, TX

I am confused. I was told today on the phone by TSP that the chambers on these heads are 62cc but the first post in this thread says 63cc. Which is it really????

May 7, 2007 | 04:10 PM

#76

WickedC5

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Anymore #s with these heads??? I might pick them up soon.

May 7, 2007 | 04:27 PM

#77

Kryckter

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Quote:

Originally Posted by WickedC5

Anymore #s with these heads??? I might pick them up soon.

Searching is your friend.

https://ls1tech.com/forums/showthrea...hlight=2.5+5.3

https://ls1tech.com/forums/dynamometer-results-comparisons/680228-475-rwhp-prc-stage-2-5-5-3l-heads-ms3-camshaft-fast-90-results.html

May 8, 2007 | 10:44 PM

#78

NHRAFORMULA00

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From: Manteno,illinois

i have ms3 ,5.3 heads with2.02 valves,fast 90/90 in a4 and put down 433 hp 373 tq on a mustang dyno.The car ran 10.75 at 124 at 3350 lbs in 1000 ft da.Thanks Texas Speed!!!

May 8, 2007 | 11:52 PM

#79

Stangkilr

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From: Kansas City, Mo

Quote:

Originally Posted by NHRAFORMULA00

i have ms3 ,5.3 heads with2.02 valves,fast 90/90 in a4 and put down 433 hp 373 tq on a mustang dyno.The car ran 10.75 at 124 at 3350 lbs in 1000 ft da.Thanks Texas Speed!!!

Holy ****!!