New to me 84 Corvette

the OEM crossfire heads for 1984 are casting number 462624 76cc heads
462624 chevy head flow numbers
(these are the heads that came on the 1984 corvettes)
just a bit of info on those stock #624 head flow rates

.......intake....exhaust
.100..44..........41cfm
.200..101..........82cfm
.300.155..........125cfm
.400..182..........137cfm
.500..196..........140cfm

(THATS PATHETIC)
the OEM cross fire intake is very restrictive and so is the exhaust,
you obviously don,t want to do something rather dumb like radically over cam the engine,
as its not able to flow nearly enough air through the heads and intake to provide much of a power boost,
but there is a way to significantly improve the potential and better heads and a renegade intake,
headers and a low restriction exhaust is well proven.
since youve already acquired a renegade intake,Id suggest the next step is research into better cylinder heads,
as they can and do provide a very noticeable boost in power, if the correct heads are matched to the application.
Id suggest you locate a set of heads that will accept a .600 minimal lift,
flow at least 250 cfm at .500 lift and have 180cc-200 cc ports to maximize results

http://garage.grumpysperformance.com/index.php?threads/sellecting-cylinder-heads.796/

https://www.hotrod.com/articles/ccrp-1209-eight-budget-sbc-head-shootout/

https://www.chevydiy.com/the-complete-cylinder-head-guide-for-chevy-small-block-engines/

https://www.jegs.com/i/Brodix/158/1021003/10002/-1
 
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Thanks Grumpy I'm pretty settled on the AFR'S 0916 cylinder heads. They are expensive to me but the future upside potential is worth the cost. They flow 260cfm@.500 so their in the ball park of your recommendations. Being in California I have to have them smog legal which they are and I just don't have the budget to LS swap or turbo/supercharge.(I may play with a 125hp NOS kit though) Like posted earlier I need to get through and pay for Christmas for my kids then I can order up me some awesome cylinder heads. I recently picked up an A/F ratio gauge and will be installing it with the heads to help with fueling demands as far as fuel pressure and injector size with the new air flow potential. I'm looking forward to this and can't hardly wait to start. What my town needs is a fast 1st gen C4 to put the fear in all the Dodge Challenger's roaming around here.
 
Crossfire Mike said:
What my town needs is a fast 1st gen C4 to put the fear in all the Dodge Challenger's roaming around here.
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Why not start a Go-Fund-Me page, I could support that with a few bucks! Who knows how far you could go with a few hundred thousand Chevy supporters !
 
How you all been doing? Keeping true to my word I'm updating with something worthwhile to share. I did it, probably before the budget was ready for it but I did get the wifes blessing as she actually said she thought it was a good idea :). The words hardly left her mouth and I had the AFR's 0916's ordered and on their way. I used summit racing as they had them in stock and I saved $50.00 over Jegs. I tried to get some local places to give me a price over the last few months but non of them ever got back to me. I'm not going to beg to spend my $$$ with them so they lost out on my business. I'll post pictures when they arrive. I still need to order up head gaskets, possibly arp bolts ect plus all the other little stuff for a cylinder head swap but I plan to get this done pretty soon. Local fast cats better watch out as I'm fixing to bring some C4 authority to the streets!!!
 
Grumpy quick question concerning the ARF cylinder heads if you see this. The AFR 0916 heads come with a spring package of 140lbs closed seat pressure, more suited to a roller cam I think. Is this too much for the crane 114132 hydraulic lifter cam I have in the car now that calls for a 114lbs closed seat pressure? 26lbs above reccomendation going to wipe my cam out? I'd love to hear your experience on this. Thanks.
 
why not call AFR (661) 257-8124 and crane cams 386-310-4875 (Select option #1) and get their thoughts on that,
thats what Id most likely do to start, (the tech line phone calls)
you have options
shop carefully theres a dozen vendors of z28 valve springs,
but without testing you have zero idea if the valve springs you receive match the printed load rates
https://www.alexsparts.com/sbc-z28-...it-500-max-lift-to-suit-stock-sbc-iron-heads/

Specs:

  • Set of sixteen Springs
  • OD: 1.265"
  • ID: .780"
  • 110 Lbs @ 1.700"
  • 310 Lbs @ .500" Lift
  • Coil Bind: 1.150"
  • Maximum lift- .500"
  • Made in the USA!
yes you can rather easily swap to a marginally lighter seat load rate valve spring, if your concerned,
and save those original valve springs for your next hydraulic roller cam upgrade,
the Z28 valve springs linked above,
may fit and are reasonably priced and are available from several vendors
measure the outer and inner diameter and installed height of the existing valve springs carefully,
or you can rather simply just increase the installed height on the valve springs with .050 offset retainers and/or .050 offset valve locks,
to get reduced valve spring seat pressures, which is probably the route Id go,
if I found through testing the springs that would get you consistently closer to that 11o lb seat pressure.
using a taller installed height (if you have the clearance required,
that mod will generally require different push rod lengths,
yeah that can get expensive,
and stock valve springs are not all that expensive

valvespringinstalled.gif

The following recommendations are from Erson Cams. If you have questions, you can reach their tech department at 800-641-7920.

Hydraulic Flat Tappet Camshaft: 110 lbs Seat pressure/250-280 lbs open pressure

Solid Flat Tappet Camshaft: 130 lbs Seat Pressure/300-325 lbs open pressure

Hydraulic Roller Camshaft: 130-140 lbs Seat Pressure/300- 355 lbs open pressure
 
Thanks for your insight. I calculated the open seat pressure with my cam and 1.6rr to be 308lbs with 140lbs closed with the springs that come on the AFR's. I guess thats too much for the cam, oh well.... I get this figured out call those tech lines and make sure it goes together proper so my cam can live happy. I'll keep you all informed as I make my decisions. Thanks again.
 
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Crossfire Mike said:
How you all been doing? Keeping true to my word I'm updating with something worthwhile to share. I did it, probably before the budget was ready for it but I did get the wifes blessing as she actually said she thought it was a good idea :). The words hardly left her mouth and I had the AFR's 0916's ordered and on their way. I used summit racing as they had them in stock and I saved $50.00 over Jegs. I tried to get some local places to give me a price over the last few months but non of them ever got back to me. I'm not going to beg to spend my $$$ with them so they lost out on my business. I'll post pictures when they arrive. I still need to order up head gaskets, possibly arp bolts ect plus all the other little stuff for a cylinder head swap but I plan to get this done pretty soon. Local fast cats better watch out as I'm fixing to bring some C4 authority to the streets!!!
Click to expand...

I try hard to shop local so I can see what I'm getting and quicker if in stock --but nooo- they want to gouge your wallet when they order it from the same place you can for less.
I'll never beg someone to take my money--especially if I know they are crooks.
 
just a thought..... Im sure if you had ordered the AFR heads direct from AFR,
AFR (661) 257-8124
https://www.airflowresearch.com/chevy/sbc-eliminator-23-cylinder-head/
they would have been only too happy to swap out the valve springs on the heads you ordered for a minimal or no cost option.
yeah, I don,t know the cost, as they might give a significant discount at some vendors vs list at AFR,
but at times its smarter to deal directly with the manufacturers.
 
Ok so I called Crane Cams spoke to their tech line and he told me, not to exceed 320lbs open seat pressure. The crane cam #114132 with 1.6rr's will have 306.9lbs intake and 312.4lbs exhaust open seat pressure with the springs that AFR put's on the heads. He said the 140lbs closed was higher than recommended but if I run a high zinc content oil I'd be fine. Looks like I'll run the heads as delivered and make sure I use a high quality high wear package content oil.

T-Test, I know what you are saying I try to shop local as much as possible but sometimes you just have to got outside your zip code to get what you want or even a response or call back... Trying to be fair they probably knew they couldn't beat the Summit or Jegs price but I don't understand why they couldn't match or come within $50 or so to get the action through their door. Doesn't matter now as their on their way as I type this.
 
 
Not trying to show off but these are just too good looking not to share. They arrived about 30min ago. IMG-2990.jpgIMG-2985.jpg Now I just need to get the stock heads off so I can measure the "poke" and make sure I get gaskets to achieve the quench I'm going after I'm looking to get about .040 I'll update when I have something else worthwhile to share.
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congrats on acquiring a nice set of cylinder heads,
yes Id be very proud of having those on my sbc corvette,
and thats partly why were here,
on this forum, to share each other's success struggles and knowledge.
 
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Thanks Grumpy, sometimes I feel a little weird showing my stuff. I tend to wait and save and plan and figure out how to get what I really want and know will work rather than make a compromise and get something that's good but not what will make me happy deep down. These AFR's cost me a pretty penny but I saved for months, skipped some lunches stayed home a lot when others were out spending money having fun and canceled some subscriptions that weren't necessary and finally made it happen.

Indycars here you go more pics, their beautiful...

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Crossfire Mike said:
here you go more pics, their beautiful...
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I know the feeling!!! You almost want to sleep with them, they are so pretty !

What size chambers ?
Are you going to put them on like they are or do you have some changes planned ? Mild Porting or Port Matching possibly ?
 
This weekend I'll get them on the bench with the Renegade lower intake to see how the ports match up if there is some minor adjusting to do then I'll get it done. As far as head spec's
AFR 0916
65cc chamber
Straight Plug
180cc Street Head Flow Chart
.200 .300 .400 .500
Int 138 198 240 260 cfm
Exh 110 158 190 207 cfm

I'm hoping to raise compression one full point or so and the less I have to port or mess with them the better for me. I'd love to be able to just bolt them on and go, but I'll find out this weekend.
 
Look them over closely for aluminum chips from machining, I found aluminum trash on my Brodix IK200 heads.

How did you decide on the 65cc chambers over the 75cc chambers ?

AlumChip0595.jpg
 
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