Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Parts for Sale/Wanted
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C3 Parts for Sale/Wanted
C3 Corvette Performance Parts, Rare NOS and NLA Chevy Parts, Wheels & Tires, Exterior Enhancements, Aftermarket Sponsored by
Paragon Corvette

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 01-10-2013, 11:35 PM   #1
70vetteguy
Junior Member
 
Member Since: Jan 2013
Default wtb 70 lt-1 heads

I have decided to bump up the hp in my base model 70. Rather than bolt on a bunch of after market parts i would like to keep the stock look. Looking for some correct date lt-1 heads that i can use to put my vette at about 400 hp stock style.
70vetteguy is offline   Reply With Quote
Old 01-11-2013, 08:24 AM   #2
WayneB_LT1
CF Senior Member
 
Member Since: Feb 2009
Location: Atlanta GA
Default

Those are like hens teeth to find and very expensive. Might want to stick with after market.
WayneB_LT1 is offline   Reply With Quote
Old 01-11-2013, 08:35 AM   #3
spf72
CF Senior Member
Support Corvetteforum!
 
spf72's Avatar
 
Member Since: Oct 2002
Location: Scarborough Maine Fredericksburg VA
Default

I have a set but If you have the stock heads on your 70 just have them rebuilt with the larger valves as they are the same 186 casting. The other difference is the screw in studs and the guide plates that can be done as well.

Doing just the heads won't make a big change in performance as there are many more differences in a LT-1 then the heads.
spf72 is offline   Reply With Quote
Old 01-11-2013, 03:01 PM   #4
70vetteguy
Junior Member
 
Member Since: Jan 2013
Default

Thanks for the tip. I may still want the heads, what condition are they in and what would you want for them? As for the power, the heads are just the start, the engine will be completely redone.
70vetteguy is offline   Reply With Quote
Old 01-11-2013, 06:23 PM   #5
boat196
CF Senior Member
Support Corvetteforum!
 
Member Since: Aug 2007
Location: Green Valley Ca
Default

Your 300hp (base) motor my have # 186 heads with 1.94 intake valve.
Bob
boat196 is offline   Reply With Quote
Old 01-12-2013, 09:38 AM   #6
surfertom
CF Senior Member
 
surfertom's Avatar
 
Member Since: Dec 2008
Location: w. jordan utah
Default heads

correct me if i'm wrong but i thought 69 LT-1 came with 186 heads while 70-71 LT-1 had x heads. if your looking for x heads i have part#973487x fresh from the machine shop new springs , new valves completly redone. let me know if interested. tom
surfertom is offline   Reply With Quote
Old 01-12-2013, 10:21 AM   #7
hotrod32
CF Member
 
hotrod32's Avatar
 
Member Since: Dec 2009
Location: Solomon Kansas
Default

What ARE the date codes your looking for?
hotrod32 is offline   Reply With Quote
Old 01-12-2013, 09:51 PM   #8
spf72
CF Senior Member
Support Corvetteforum!
 
spf72's Avatar
 
Member Since: Oct 2002
Location: Scarborough Maine Fredericksburg VA
Default

There was no 69 Corvette LT-1 and the 70 standard 350 had the same 186 heads as the LT-1 The LT-1 has the larger valves, screw in studs and guide plates. If the OP car has stock heads they can easily be made the same as an LT-1.

My heads are rebuilt and have not been used since the rebuild. I am away and will check what I have into them when I get home. Because I will include the price of the heads combined with machine work it will probably be twice what it would cost to have yours redone and they won't be any better.
spf72 is offline   Reply With Quote
Old 01-13-2013, 09:43 AM   #9
1974ta
CF Senior Member
 
Member Since: Feb 2004
Location: Damascus MD
Default

Quote:
Originally Posted by spf72 View Post
There was no 69 Corvette LT-1 and the 70 standard 350 had the same 186 heads as the LT-1 The LT-1 has the larger valves, screw in studs and guide plates. If the OP car has stock heads they can easily be made the same as an LT-1.

My heads are rebuilt and have not been used since the rebuild. I am away and will check what I have into them when I get home. Because I will include the price of the heads combined with machine work it will probably be twice what it would cost to have yours redone and they won't be any better.
Actually the valves were the same size between L46 and LT1. Not sure of base motor. LT1 Heads did have screw in studs, different springs and guide plates. Based on testing the 2-1/2" exhaust and the high rise aluminum intake on the LT-1 accounted for most of the power increase. Yes it revs higher but torque characteristics seem to be very close to L46.

What is interesting is than unless he has a numbers matching block and wants the correct heads, he is WAAAY better of buying some brand new aluminum heads. They will flow WAAY better out of the box and save weight.

Just my two cents as I have an all original L46 that I would like to make more power.

Bill
1974ta is offline   Reply With Quote
Old 01-13-2013, 04:06 PM   #10
spf72
CF Senior Member
Support Corvetteforum!
 
spf72's Avatar
 
Member Since: Oct 2002
Location: Scarborough Maine Fredericksburg VA
Default

I agree on the L46 but the op said his engine is base and I thought that has 1.94 although I may be wrong as I am using my base 72 for my info. I also would think the lower end and carb of the LT-1 has a lot to do with the difference.

The OP said he wants to keep his car closer to an original look and my only point is that rebuilding his stock heads is a less expensive way to go even if you put in larger valves.

There is a set on eBay for $1000 that are rebuilt. I will want more for mine as the dates are right for a 70 build and I am partial to that year and engine. You could rebuild yours for around half that. I also agree you can buy much better new heads for less just some of us like period stuff.
spf72 is offline   Reply With Quote
Old 01-13-2013, 09:12 PM   #11
1974ta
CF Senior Member
 
Member Since: Feb 2004
Location: Damascus MD
Default

Quote:
Originally Posted by spf72 View Post
I agree on the L46 but the op said his engine is base and I thought that has 1.94 although I may be wrong as I am using my base 72 for my info. I also would think the lower end and carb of the LT-1 has a lot to do with the difference.

The OP said he wants to keep his car closer to an original look and my only point is that rebuilding his stock heads is a less expensive way to go even if you put in larger valves.

There is a set on eBay for $1000 that are rebuilt. I will want more for mine as the dates are right for a 70 build and I am partial to that year and engine. You could rebuild yours for around half that. I also agree you can buy much better new heads for less just some of us like period stuff.
Believe it or not the bottom end on an L46 and LT1 are identical. Both use the "pink" rods and upgraded crank.

I am not sure about a base motor either in terms of valve size.

Bill
1974ta is offline   Reply With Quote
Old 01-14-2013, 02:28 PM   #12
70vetteguy
Junior Member
 
Member Since: Jan 2013
Default

Thanks for all the help on the heads guys. I think i'm gonna have my original 186 heads rebuilt with the bigger valves, screw in studs and guide plates, along with a port and polish. If the price of the heads being rebuilt is unreasonable, i'll probably go with the performer rpm heads and paint them orange
70vetteguy is offline   Reply With Quote
Old 01-14-2013, 03:50 PM   #13
spf72
CF Senior Member
Support Corvetteforum!
 
spf72's Avatar
 
Member Since: Oct 2002
Location: Scarborough Maine Fredericksburg VA
Default

I think that is a wise choice. I had a set done last year and it was somewhere between $500 - $600.
spf72 is offline   Reply With Quote
Old 01-14-2013, 04:11 PM   #14
Sky65
CF Senior Member
St. Jude Donor '05-'09
Support Corvetteforum!
 
Sky65's Avatar
 
Member Since: Nov 2003
Location: Maryland
Default

Quote:
Originally Posted by 70vetteguy View Post
Thanks for all the help on the heads guys. I think i'm gonna have my original 186 heads rebuilt with the bigger valves, screw in studs and guide plates, along with a port and polish. If the price of the heads being rebuilt is unreasonable, i'll probably go with the performer rpm heads and paint them orange
Where are you located? I have a used set of Performer RPM heads I may be able to let go for the price of rebuilding your stock heads.

Tom
Sky65 is offline   Reply With Quote
Old 01-14-2013, 04:11 PM
 
Go Back   Corvette Forum > C3 Corvettes, 1968 - 1982 > C3 Parts for Sale/Wanted
Reload this Page wtb 70 lt-1 heads
 
 
 
Reply


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to get 30-40hp more from an LT-1? GKK C4 Tech/Performance 7 01-09-2014 08:44 PM
1972 LT1 heads and performance vs 1970 LT1 jrheyerly C3 Tech/Performance 12 05-10-2013 10:16 AM
How many HP will original fuel pump/lines support LT1 Niklas C4 Scan & Tune 0 04-15-2013 03:48 PM
WTB 70 Schwitzer Fan clutch spf72 C3 Parts for Sale/Wanted 5 01-10-2013 08:53 PM
1970-71 LT1 engines riverracer au C3 Tech/Performance 13 07-26-2012 09:32 PM


All times are GMT -4. The time now is 06:21 PM.


Emails & Password Backup

Search Engine Friendly URLs by vBSEO 3.5.2