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Thinking about parts selection

 
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nwcc
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Joined: 11 Aug 2005
Posts: 453
Location: Pacific Northwest
158.80 points



PostPosted: Tue Apr 17, 2007 3:32 pm    Post subject: Thinking about parts selection Reply with quote

I have some parts that I've been collecting in my shop for this engine project.

SBC 355 w/ 11.5 to 1 compression and .044 quench

GM 372 heads ported to:
Lift Intake Exhaust
.100 69 55
.200 142 120
.300 201 163
.400 244 199
.500 274 221
.550 282 230
.600 287 242
@ 28" water

Roller 1313 grind cam
Duration @.020" I 272 / E 282
Duration @ .050" I 238 / E 248
Lobe Sep 110
Lobe center I 105 E 115
Lift I .546 E.586

Roller rocker arms

Ported factory intake

1000cfm throttle body

37# @3 bar injectors

Perfect Power XMS controller

Hooker super comp headers


I'm now having second thoughts on my cam selection. Anyone have a cam in mind thats better suited to this combo?
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96capriceMGR
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Joined: 23 Aug 2003
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Location: New London Wisconsin
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1996 Chevrolet Caprice

PostPosted: Tue Apr 17, 2007 8:20 pm    Post subject: Reply with quote

Honestly those flow numbers seem a bit questionable.


How high do you want to rev it?
The LT1 intake tends to move the powerband a little higher than most gen 1 guys expect.
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nwcc
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Location: Pacific Northwest
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PostPosted: Tue Apr 17, 2007 9:31 pm    Post subject: Reply with quote

96capriceMGR wrote:
Honestly those flow numbers seem a bit questionable.


How high do you want to rev it?
The LT1 intake tends to move the powerband a little higher than most gen 1 guys expect.


I sent these heads to TEA with 2.00/1.56 valves already installed and a fair amount of porting already done. This is what they sent back. I also checked them with my DIY flow bench.

I'm comfortable reving this engine to 7500 RPM. Its got a Scat forged crank and Eagle H beam rods.
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96capriceMGR
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Joined: 23 Aug 2003
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Location: New London Wisconsin
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1996 Chevrolet Caprice

PostPosted: Tue Apr 17, 2007 10:15 pm    Post subject: Reply with quote

Probably not too far off track far as cam specs then. Ideally I would have tightened quench a little more and depending what DCR that cam get you you might have gotten away with a little more static compression.
I am running about 11.5 on my stock shortblock, heads are milled to 53.1cc and a .026x4.100 gasket.
For reference my cam is mid 220s intake and less lift than your exhaust on both sides even with the 1.6 rockers. I lost a 100K miole shortblock when I tried to dyno it and had a problems before that but it appeared to peak about 6100. Which in hindsight means commanding the shift at 6050rpms like I was was foolish. I had dismissed the dyno info because of the problems but as I kept researching over the winter I made better sense of things wuill shift higher this year.

Looking forward to your results.

TEA is known for very high flow numbers, a flowbench is not an engine though just a tool that allows some form of evaluation without a full engine build.
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nwcc
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PostPosted: Wed Apr 18, 2007 12:33 am    Post subject: Reply with quote

96capriceMGR wrote:
Probably not too far off track far as cam specs then. Ideally I would have tightened quench a little more and depending what DCR that cam get you you might have gotten away with a little more static compression.


The DCR calculator I use computes it to a 9.42041 dynamic and 11.4964 static.
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clay
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1972 Chevrolet Nova

PostPosted: Thu Apr 19, 2007 1:13 pm    Post subject: Reply with quote

From what I have read, you might could drop back to a single pattern cam based on head flow. Exhaust is pretty much 80% or better of intake at every point - unless a power adder is in store Twisted Evil . Clay
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nwcc
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Posts: 453
Location: Pacific Northwest
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PostPosted: Thu Apr 19, 2007 4:18 pm    Post subject: Reply with quote

clay wrote:
From what I have read, you might could drop back to a single pattern cam based on head flow. Exhaust is pretty much 80% or better of intake at every point - unless a power adder is in store Twisted Evil . Clay


Contemplating a 150 shot of "the bottle"
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