I just bought an 86 z28 with a 305 tpi in it. I was wondering what would be the best heads would be for it, keeping in mind im on a tight budget. Which heads would give me the best bang for my buck. I was also wondering what kind of rear-end it has in it, ive heard it may have 373s in it and that it also may have a posi in it. Is there anyway to be sure? Any help you guys could give me would be appreciated.

 

I'm sure it has a posi. It looks like your only gear options with TPI for that year were 2.73 or 3.23. The L69 had optional 3.73s
Take a look in your center console for the gear code. GU2= 2.73 GU5= 3.23 also look for the G92 code. Here's some good reading for you. www.thirdgen.org/newdesign/tech/techdb.shtml

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Mario,
White 94 Z28
Yeah I got a few mods
Video
Black 87 IROC-Z

 

Hey bro. Well, heres a sure fire way to check whether or not you have posi. Just burn out. If you see 2 tire marks, there you go, POSI, if not,well, then you're like me! I would venture to guess that a 305 TPI would proly come with 3.23's. My 86 Z has 2.73 non-posi.

As for heads, try Worlds S/R Torquer 305's. They are made specifically for small displacement chevys and retain the stock 58cc chamber size. So you won;t loose any of that compression! They are cheap, only about 350.00 assembled I think. maybe even a little less. They are some of the most cost effective bolt ons for our motors. Look into them seriously. Will be alot easier on your wallet than porting and polishing the stock heads. And less work too! Well, I hope that helps man! Take it easy!

Will

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'86 Z-28 305 c.i. LG4
Rochester QuadraJet 4bbl
Flowmaster 80 series Chrome Tips
Dual Snorkel Air Cleaner
K&N Filter
Michellin P215/65/R15 X-Radial Plus
Lots of Mods on the way
Pioneer 4"x6" dash
Pioneer 6"x9" rear
Alpine 8" Type S in bandpass box
Alpine Amp 300x1 bridged
Sony 4000X- x-Plode Deck 50w x4

Soon to be sporting Hooker SuperComp Shorties, CompCam Xtreme 256H, Edelbrock Performer EGR, World Sr Torquer 305's, DynoMax Super Converter, and American Thunder 3" Cat-Back !!!

http://camaroz28.cardomain.com/id/stanghunter211

 

Do you think the vortec heads would be a good choice or do you think i would be wasting my money? Also, the car was missing the radiator so the guy who sold us the car gave us a new one. I was told it was only a two core and it might have trouble keeping the car from overheating, is this true?



[This message has been edited by holmes677 (edited July 22, 2002).]

 

Best Bang for your buck World Products Motown Heads..

Go to www.theengineshop.com and shop around in there, get the 220cc Intake heads you will never need to go bigger,a dn get the aluminum ones while your at it. only $750.00 for the whole bang..

Kevin

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86 Chevrolet Camaro Iroc Z-28 Fully Loaded With T-Tops
Mods;
Spohn SubFrame Connectors, S&W Race Car Chassis 8 point Roll Cage, 1997 SS Aniversary 3.42 POSI Rear End with 12" Rotors and 4 Piston PBR Calipers, Balanced Drive shaft... Others soon to come...

Best times before any mods done, Complety Stock;15.6 @ 87mph
Waiting for the tracks to open again to see what I got going on Now!

ntimad8.cz28.com

 

Unfortunately, the Motown heads won't work for two reasons.
1. 2.02 and larger valved heads won't work because the bore is too narrow.
2. 220 heads are waaaay to big for a 305. They are meant for big cube SBCs.

The SRs are the cheapest head to upgrade with. The only fly in the ointment is they will be a bottle-neck if you ever swap out the shortblock for anything bigger.

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Mike

'90 IROC-Z, 5-speed, ZZ4, G1 Trick Flows Moderator SEThirdgen