Turn-key L35 head package

Scubanme

New member
Re: Turn-key L35 head package

What year engines come with L35 heads that are dierectly compatable for the Syclones, mounting holes etc?
 

Scubanme

New member
Re: Turn-key L35 head package

You're not contemplating molesting that beautiful, STOCK, piece of history Syclone you just purchased by taking it apart to change the heads, are you?

Then it has to be tuned.....Might as well do bigger injectors and turbo to get the full benefit...And on it goes. Pretty soon you have just another messed-up, modded Syclone. It's a slippery slope, my friend. Choose wisely.

At 16,500 I think you got a good deal. Take care of it, and I think it will always be worth that and perhaps more at Barrett-Jackson, even with hammer fees.. But mod it, and it will be an instant 10k-ish at best Syclone. It's your truck. I just hate to see another beautiful "survivor" get f'd up. They're only "original" once. They don't make these any longer.

DaveP

If you read my prior posts, I plan to leave it stock, but I sitll want to be informed. I enjoy reading all these post, that is the reason I joined this forum.
 

WyoSyclone

Active member
Re: Turn-key L35 head package

Small update.

Just got off the phone with my builder and we've decided to go with all Manley components on this first set of heads. They've got some extreme duty exhaust valves that will work well for us (we're sticking with stock size valves), and they also have a new alloy that they've incorporated in a line of retainers and keepers.

Valve springs will be beehive and will accomodate .580 lift. We'll use ARP rocker studs.

They'll be together in a couple of weeks then we'll take them up to the flow bench and see what we can do with them.
 

Scubanme

New member
Re: Turn-key L35 head package

There is a shop in southern California called Speed-O-Motive, it has been in numerous magazine articles and they have a full machine shop and head porting facilities. They will put in new stock size valves and port your stock heads for $1,000.00 They say they pick up quite a bit of power because the stock heads flow very poorly. I don't know if that is a good price or not? Stock L-35 heads at my price is about $480. each brand new from GM, but I don't know if that comes with valves or bare heads.
 

WyoSyclone

Active member
Re: Turn-key L35 head package


Talked to my machinist on Friday... he's still busy finishing up 'race' motors so has left some of the smaller projects sit on the side. He said he'll get to the heads in the next couple of weeks. Sorry it's taking so long.
 

Treymen

Donating Member
Re: Turn-key L35 head package

What is the combustion chamber on these? Just curious about how much these will affect the compression ratio?.....Thanks
 

atkonkler

Is this your bush?
Re: Turn-key L35 head package

Hey Wyo I'd like to snag a pair from you and be willing to pay for them with my first born if I have to.let me know asap if your going thru with it.my motor is completely stock and gonna go thru a major overhaul this winter and I'd love to make an addition to your bank Account. Thanks buddy!
 

1BADV6

Donating Member
Re: Turn-key L35 head package

Hey Wyo I'd like to snag a pair from you and be willing to pay for them with my first born if I have to.let me know asap if your going thru with it.my motor is completely stock and gonna go thru a major overhaul this winter and I'd love to make an addition to your bank Account. Thanks buddy!

PM sent
 

WyoSyclone

Active member
Re: Turn-key L35 head package

Any news Rob? I'm going to need a set soon.

I kind of dropped the ball with my move out here to Oregon. I'll give the machinist a call and tell him to get a move on them - I've given him plenty of time to get his other stuff taken care of.
 

Treymen

Donating Member
Re: Turn-key L35 head package

So Rob, are you going to be able to make it up to Turbo Thunder this summer? Would love to see some more syty support there.
 

WyoSyclone

Active member
Re: Turn-key L35 head package

So Rob, are you going to be able to make it up to Turbo Thunder this summer? Would love to see some more syty support there.

I'd like to.. I'll have to check out the date. I'll be moving our whole household out here come Spring/early Summer so i'll just have to see how it goes. It will either be three trips in a 27 foot uHaul, or hire a moving company. Plus I have to tow the Sy out. Turbo Thunder sounds like it could be a lot of fun!
 

Treymen

Donating Member
Re: Turn-key L35 head package

If we get enough owners out there it is fun. If not, it's a lot of rice burners. I think last year it was the 2nd week in July. Look forward to getting together either way and brain picking. As far as moving goes, we had a moving company move us from AZ to WA, it was about $7500. It's a 1500 mile drive, so it didn't make sence for me to make several trips. If I had it to do over again, I would rent a 24' uhaul and tow trailer. Rental and fuel costs would have been about $2200.
 

MoJo

New member
Re: Turn-key L35 head package

What is the combustion chamber on these? Just curious about how much these will affect the compression ratio?.....Thanks

I am using 1993 L35 heads (casting #14099064) and they checked at 64 CC with only a .005" clean up mill. Those heads make 9.8:1 on a .030" OS, 4.3L V6.. My engine has Speed Pro LF2256 flat top 4-valve relief pistons, . That is 1.4 too high for a turbo or nitrous, so those pistons would need.to be dished.
 
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