http://www.airflowresearch.com/chev190.html
Options ordered with my heads are as follows:
AFR P/N | Description | Comment | Est. Cost |
1147
1226
|
190cc, L98 plug angle, 74cc open chamber, bare
Machine for Heat cross over
|
I wanted 180cc intake runners, but the tech talked me out of it. The ZZ4 heads have 163cc ports so it will be a substantial low-end change. The plug angle should match what I have now. | $1275 |
1263 | Drill for Centerbolt Valvecover package | about the same costs as a decent set of new rocker covers and wirelooms | $ 45 |
1230 | Angle mill to 58cc chamber, adj. intake angle (flat-mill from 74cc to 68cc, angle-mill from 68cc to 58cc) |
Size combustion chamber to that of the ZZ4 heads | $ 250 |
1561 | Temperature Sensor drill/tap | Wasn't sure about this, can always plug it I guess? | $ 25 |
8504 | Titanium Retainers (1.450" springs) | Fairly inexpensive safety/performance option | $ 120 |
6155 (6163, 6164, 6153) | Hydra-Rev roller cam rev kit (OEM lifters)
Factory rev kit bars
|
That OEM "spider" always did bother me.. | $ 229 |
6305 | ARP Head Stud kit | Last thing I want to do is strip out the threads in the block. I suffer from IDKMOS syndrome (I Don't Know My Own Strength) and since I'll have the heads on/off a bit to check valve clearance, I thought this was a good option. | $ 150 |
6805 | FelPro 1010 Head Gasket (0.039") | The ZZ4 comes with 0.051" gaskets (p/n 12557236) so these should help the quench and raise compression to about 10.4:1 if I can keep the piston/valve clearance to over 0.100" | $ 66 |
Head/Lift (CFM Flow Exh/Ink/% ) | 0.050 | 0.100 | 0.150 | 0.200 | 0.300 | 0.400 | 0.500 | 0.550 |
ZZ4/L98 | 22.8 / 30.2 = 75.5% | 47.3 / 58.2 = 81.3% | 70.4 / 90.4 = 77.9% | 94.0 / 116.4 = 80.8% | 126.0 / 158.4 = 79.5% | 145.0 / 185.0 = 78.8% | 160.6 / 193.1 = 83.2% | 162.2 / 193.1 = 84.0% |
AFR 190 | 26.3 / 32.2 = 81.7% | 57.0 / 65.8 = 86.6% | 85.5 / 103.4 = 82.7% | 116.9 / 137.6 = 84.9% | 165.4 / 190.9 = 86.6% | 190.8 / 230.9 = 82.3% | 201.9 / 245.7 = 82.2% | 203.5 / 245.7 = 82.3% |
Change | +3.5 / +2.0 = +6.2% | +9.7 / +7.6 = +5.3% | +15.1 / +13.0 = +4.8% | +22.9 / +21.2 = +4.1% | +39.4 / +32.5 = +7.1% | +45.8 / +45.9 = +7.1% | +41.3 / +52.6 = -1.0% | +41.3 / +52.6 = -1.7% |
Photos of AFR Heads as they arrived in the mail
Photos of ZZ4 Head removal
Photos of AFR Head install preliminaries
Photos of AFR Head prep-work
Photos of AFR Heads on Hydra-Rev kit
Photos Semi-Siamesed Edelbrock TPI Base
Photos Semi-Siamesed Edelbrock TPI Base porting
Photos Lashing, SFCs, leaks
Photos SFC Install
Photos GMHTP EFI-I 2001
Photos 1.5 stock rocker testing
Photos 1.6 RR replacement
Photos Semi-Siamesed Edelbrock TPI Base Install
Photos Exhaust Valve tips from Crane RRs
Photos Pro-Magnum 7/16" RR upgd and lifter swap
Photos AFR D-side removal and diag
Photos Final Diag, what'a year..